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authorNatanael Copa <ncopa@alpinelinux.org>2013-09-24 11:13:47 +0000
committerNatanael Copa <ncopa@alpinelinux.org>2013-09-24 11:13:47 +0000
commitd6e220d66c18fe46217c74b815c37adacaae3445 (patch)
treed0338e83d80bf2cd9a4ad0b24bd28c0982c42b6f /main/libc0.9.32/0001-libc-add-get-set-swap-make-context-user-context-mani.patch
parenta6d3bd53ce667af4b44820b993a34ffefea72991 (diff)
downloadaports-d6e220d66c18fe46217c74b815c37adacaae3445.tar.bz2
aports-d6e220d66c18fe46217c74b815c37adacaae3445.tar.xz
main/libc0.9.32: use ucontext upstream git master
it includes the definitions in the ucontext.h file. We also need set ASFLAGS to be re-entrant.
Diffstat (limited to 'main/libc0.9.32/0001-libc-add-get-set-swap-make-context-user-context-mani.patch')
-rw-r--r--main/libc0.9.32/0001-libc-add-get-set-swap-make-context-user-context-mani.patch2550
1 files changed, 2550 insertions, 0 deletions
diff --git a/main/libc0.9.32/0001-libc-add-get-set-swap-make-context-user-context-mani.patch b/main/libc0.9.32/0001-libc-add-get-set-swap-make-context-user-context-mani.patch
new file mode 100644
index 0000000000..98bb707b01
--- /dev/null
+++ b/main/libc0.9.32/0001-libc-add-get-set-swap-make-context-user-context-mani.patch
@@ -0,0 +1,2550 @@
+From a8dc90eaaa5e6474beac828558d969b1aafee4af Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <florian@openwrt.org>
+Date: Wed, 9 Jan 2013 16:17:21 +0100
+Subject: [PATCH] libc: add {get,set,swap,make}context user context
+ manipulation functions
+
+Add the obsolescent SUSv3 family of user context manipulating functions
+for arm, i386, mips, x86_64.
+
+Signed-off-by: Timon ter Braak <timonterbraak@gmail.com>
+Signed-off-by: Florian Fainelli <florian@openwrt.org>
+Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
+Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
+Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
+---
+ Rules.mak | 2 +
+ extra/Configs/Config.arm | 1 +
+ extra/Configs/Config.i386 | 1 +
+ extra/Configs/Config.in | 16 ++
+ extra/Configs/Config.mips | 1 +
+ extra/Configs/Config.x86_64 | 1 +
+ include/ucontext.h | 32 +++-
+ libc/.gitignore | 1 +
+ libc/sysdeps/linux/Makefile.commonarch | 20 +-
+ libc/sysdeps/linux/arm/Makefile.arch | 5 +
+ libc/sysdeps/linux/arm/getcontext.S | 80 ++++++++
+ libc/sysdeps/linux/arm/makecontext.c | 73 +++++++
+ libc/sysdeps/linux/arm/setcontext.S | 76 ++++++++
+ libc/sysdeps/linux/arm/swapcontext.S | 63 ++++++
+ libc/sysdeps/linux/arm/ucontext_i.sym | 30 +++
+ libc/sysdeps/linux/i386/Makefile.arch | 4 +
+ libc/sysdeps/linux/i386/getcontext.S | 84 ++++++++
+ libc/sysdeps/linux/i386/makecontext.S | 123 ++++++++++++
+ libc/sysdeps/linux/i386/setcontext.S | 96 ++++++++++
+ libc/sysdeps/linux/i386/swapcontext.S | 110 +++++++++++
+ libc/sysdeps/linux/i386/ucontext_i.sym | 30 +++
+ libc/sysdeps/linux/mips/Makefile.arch | 4 +
+ libc/sysdeps/linux/mips/getcontext.S | 148 +++++++++++++++
+ libc/sysdeps/linux/mips/kernel_rt_sigframe.h | 10 +
+ libc/sysdeps/linux/mips/makecontext.S | 188 ++++++++++++++++++
+ libc/sysdeps/linux/mips/setcontext.S | 191 +++++++++++++++++++
+ libc/sysdeps/linux/mips/swapcontext.S | 211 +++++++++++++++++++++
+ libc/sysdeps/linux/mips/ucontext_i.sym | 52 +++++
+ libc/sysdeps/linux/x86_64/Makefile.arch | 5 +
+ libc/sysdeps/linux/x86_64/__start_context.S | 49 +++++
+ libc/sysdeps/linux/x86_64/getcontext.S | 88 +++++++++
+ libc/sysdeps/linux/x86_64/makecontext.c | 121 ++++++++++++
+ libc/sysdeps/linux/x86_64/setcontext.S | 103 ++++++++++
+ libc/sysdeps/linux/x86_64/swapcontext.S | 121 ++++++++++++
+ libc/sysdeps/linux/x86_64/ucontext_i.sym | 37 ++++
+ libpthread/nptl/sysdeps/Makefile.commonarch | 3 +-
+ .../sysdeps/unix/sysv/linux/Makefile.commonarch | 2 -
+ 37 files changed, 2174 insertions(+), 8 deletions(-)
+ create mode 100644 libc/.gitignore
+ create mode 100644 libc/sysdeps/linux/arm/getcontext.S
+ create mode 100644 libc/sysdeps/linux/arm/makecontext.c
+ create mode 100644 libc/sysdeps/linux/arm/setcontext.S
+ create mode 100644 libc/sysdeps/linux/arm/swapcontext.S
+ create mode 100644 libc/sysdeps/linux/arm/ucontext_i.sym
+ create mode 100644 libc/sysdeps/linux/i386/getcontext.S
+ create mode 100644 libc/sysdeps/linux/i386/makecontext.S
+ create mode 100644 libc/sysdeps/linux/i386/setcontext.S
+ create mode 100644 libc/sysdeps/linux/i386/swapcontext.S
+ create mode 100644 libc/sysdeps/linux/i386/ucontext_i.sym
+ create mode 100644 libc/sysdeps/linux/mips/getcontext.S
+ create mode 100644 libc/sysdeps/linux/mips/kernel_rt_sigframe.h
+ create mode 100644 libc/sysdeps/linux/mips/makecontext.S
+ create mode 100644 libc/sysdeps/linux/mips/setcontext.S
+ create mode 100644 libc/sysdeps/linux/mips/swapcontext.S
+ create mode 100644 libc/sysdeps/linux/mips/ucontext_i.sym
+ create mode 100644 libc/sysdeps/linux/x86_64/__start_context.S
+ create mode 100644 libc/sysdeps/linux/x86_64/getcontext.S
+ create mode 100644 libc/sysdeps/linux/x86_64/makecontext.c
+ create mode 100644 libc/sysdeps/linux/x86_64/setcontext.S
+ create mode 100644 libc/sysdeps/linux/x86_64/swapcontext.S
+ create mode 100644 libc/sysdeps/linux/x86_64/ucontext_i.sym
+
+diff --git a/Rules.mak b/Rules.mak
+index 96871e1..8943fbf 100644
+--- a/Rules.mak
++++ b/Rules.mak
+@@ -813,3 +813,5 @@ SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
+ endif
+
+ LOCAL_INSTALL_PATH := install_dir
++
++PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
+diff --git a/extra/Configs/Config.arm b/extra/Configs/Config.arm
+index 0bb2971..dc53643 100644
+--- a/extra/Configs/Config.arm
++++ b/extra/Configs/Config.arm
+@@ -11,6 +11,7 @@ config FORCE_OPTIONS_FOR_ARCH
+ bool
+ default y
+ select ARCH_ANY_ENDIAN
++ select ARCH_HAS_UCONTEXT
+
+ config CONFIG_ARM_EABI
+ bool "Build for EABI"
+diff --git a/extra/Configs/Config.i386 b/extra/Configs/Config.i386
+index 288aa5e..92cee3b 100644
+--- a/extra/Configs/Config.i386
++++ b/extra/Configs/Config.i386
+@@ -12,6 +12,7 @@ config FORCE_OPTIONS_FOR_ARCH
+ default y
+ select ARCH_LITTLE_ENDIAN
+ select ARCH_HAS_MMU
++ select ARCH_HAS_UCONTEXT
+
+ choice
+ prompt "Target x86 Processor Family"
+diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
+index 4bb6812..62bcd9b 100644
+--- a/extra/Configs/Config.in
++++ b/extra/Configs/Config.in
+@@ -261,6 +261,9 @@ config ARCH_HAS_NO_LDSO
+ bool
+ select ARCH_HAS_NO_SHARED
+
++config ARCH_HAS_UCONTEXT
++ bool
++
+ config HAVE_SHARED
+ bool "Enable shared libraries"
+ depends on !ARCH_HAS_NO_SHARED
+@@ -678,6 +681,19 @@ config UCLIBC_SUSV3_LEGACY
+
+ WARNING! ABI incompatibility.
+
++config UCLIBC_HAS_CONTEXT_FUNCS
++ bool "Use obsolescent context control functions"
++ depends on UCLIBC_SUSV3_LEGACY && ARCH_HAS_UCONTEXT
++ help
++ Add into library the SuSv3 obsolescent functions used for context
++ control. The setcontext family allows the implementation in C of
++ advanced control flow patterns such as iterators, fibers, and
++ coroutines. They may be viewed as an advanced version of
++ setjmp/longjmp; whereas the latter allows only a single non-local jump
++ up the stack, setcontext allows the creation of multiple cooperative
++ threads of control, each with its own stack.
++ These functions are: setcontext, getcontext, makecontext, swapcontext.
++
+ config UCLIBC_SUSV3_LEGACY_MACROS
+ bool "Enable SuSv3 LEGACY macros"
+ help
+diff --git a/extra/Configs/Config.mips b/extra/Configs/Config.mips
+index 063b07c..48e0b64 100644
+--- a/extra/Configs/Config.mips
++++ b/extra/Configs/Config.mips
+@@ -11,6 +11,7 @@ config FORCE_OPTIONS_FOR_ARCH
+ bool
+ default y
+ select ARCH_ANY_ENDIAN
++ select ARCH_HAS_UCONTEXT
+
+ choice
+ prompt "Target ABI"
+diff --git a/extra/Configs/Config.x86_64 b/extra/Configs/Config.x86_64
+index 1b28088..4c8c3a9 100644
+--- a/extra/Configs/Config.x86_64
++++ b/extra/Configs/Config.x86_64
+@@ -12,3 +12,4 @@ config FORCE_OPTIONS_FOR_ARCH
+ default y
+ select ARCH_LITTLE_ENDIAN
+ select ARCH_HAS_MMU
++ select ARCH_HAS_UCONTEXT
+diff --git a/include/ucontext.h b/include/ucontext.h
+index 14a1270..f11db77 100644
+--- a/include/ucontext.h
++++ b/include/ucontext.h
+@@ -15,17 +15,43 @@
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
++/* The System V ABI user-level context switching support functions
++ are marked obsolescent by SuSv3. */
++
+ #ifndef _UCONTEXT_H
+ #define _UCONTEXT_H 1
+
+ #include <features.h>
+
++#ifdef __UCLIBC_HAS_CONTEXT_FUNCS__
++
+ /* Get machine dependent definition of data structures. */
+ #include <sys/ucontext.h>
+
+-/* The System V ABI user-level context switching support functions
+- * are marked obsolescent by SuSv3, and are not implemented by
+- * uClibc. This header is therefore empty. */
++__BEGIN_DECLS
++
++/* Get user context and store it in variable pointed to by UCP. */
++extern int getcontext (ucontext_t *__ucp) __THROW;
++
++/* Set user context from information of variable pointed to by UCP. */
++extern int setcontext (const ucontext_t *__ucp) __THROW;
++
++/* Save current context in context variable pointed to by OUCP and set
++ context from variable pointed to by UCP. */
++extern int swapcontext (ucontext_t *__restrict __oucp,
++ const ucontext_t *__restrict __ucp) __THROW;
++
++/* Manipulate user context UCP to continue with calling functions FUNC
++ and the ARGC-1 parameters following ARGC when the context is used
++ the next time in `setcontext' or `swapcontext'.
++
++ We cannot say anything about the parameters FUNC takes; `void'
++ is as good as any other choice. */
++extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
++ int __argc, ...) __THROW;
++
++__END_DECLS
+
++#endif
+
+ #endif /* ucontext.h */
+diff --git a/libc/.gitignore b/libc/.gitignore
+new file mode 100644
+index 0000000..f4c0305
+--- /dev/null
++++ b/libc/.gitignore
+@@ -0,0 +1 @@
++ucontext_i.[chs]
+diff --git a/libc/sysdeps/linux/Makefile.commonarch b/libc/sysdeps/linux/Makefile.commonarch
+index c1bc5df..ac89e72 100644
+--- a/libc/sysdeps/linux/Makefile.commonarch
++++ b/libc/sysdeps/linux/Makefile.commonarch
+@@ -37,5 +37,23 @@ headers-y += $(ARCH_HEADERS_OUT)
+ headers_clean-y += HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT))
+ HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)):
+ $(do_rm) $(ARCH_HEADERS_OUT)
+-
+ endif
++
++CFLAGS-ucontext_i.c = -S
++
++$(ARCH_OUT)/ucontext_i.c: $(ARCH_DIR)/ucontext_i.sym
++ $(do_awk) $(top_srcdir)extra/scripts/gen-as-const.awk $< > $@
++
++$(ARCH_OUT)/ucontext_i.s: $(ARCH_OUT)/ucontext_i.c
++ $(compile.c)
++
++$(ARCH_OUT)/ucontext_i.h: $(ARCH_OUT)/ucontext_i.s
++ $(do_sed) $(PTHREAD_GENERATE_MANGLE) $< > $@
++
++pregen-headers-$(UCLIBC_HAS_CONTEXT_FUNCS) += $(ARCH_OUT)/ucontext_i.h
++
++headers_clean-$(UCLIBC_HAS_CONTEXT_FUNCS) += \
++ HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)/ucontext_i)
++
++HEADERCLEAN_$(subst $(top_builddir),,$(ARCH_OUT)/ucontext_i):
++ $(do_rm) $(addprefix $(ARCH_OUT)/ucontext_i., c h s)
+diff --git a/libc/sysdeps/linux/arm/Makefile.arch b/libc/sysdeps/linux/arm/Makefile.arch
+index 5fc3e54..36d988b 100644
+--- a/libc/sysdeps/linux/arm/Makefile.arch
++++ b/libc/sysdeps/linux/arm/Makefile.arch
+@@ -43,3 +43,8 @@ libc-static-y += $(ARCH_OUT)/aeabi_lcsts.o $(ARCH_OUT)/aeabi_math.o \
+ libc-nonshared-y += $(ARCH_OUT)/aeabi_lcsts.os $(ARCH_OUT)/aeabi_math.os \
+ $(ARCH_OUT)/aeabi_sighandlers.os $(ARCH_OUT)/aeabi_unwind_cpp_pr1.o
+ endif
++
++ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
++CSRC += makecontext.c
++SSRC += getcontext.S setcontext.S swapcontext.S
++endif
+diff --git a/libc/sysdeps/linux/arm/getcontext.S b/libc/sysdeps/linux/arm/getcontext.S
+new file mode 100644
+index 0000000..a987c52
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/getcontext.S
+@@ -0,0 +1,80 @@
++/* Copyright (C) 2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++ .syntax unified
++ .text
++
++/* int getcontext (ucontext_t *ucp) */
++
++ENTRY(__getcontext)
++ /* No need to save r0-r3, d0-d7, or d16-d31. */
++ add r1, r0, #MCONTEXT_ARM_R4
++ stmia r1, {r4-r11}
++
++ /* Save R13 separately as Thumb can't STM it. */
++ str r13, [r0, #MCONTEXT_ARM_SP]
++ str r14, [r0, #MCONTEXT_ARM_LR]
++ /* Return to LR */
++ str r14, [r0, #MCONTEXT_ARM_PC]
++ /* Return zero */
++ mov r2, #0
++ str r2, [r0, #MCONTEXT_ARM_R0]
++
++ /* Save ucontext_t * across the next call. */
++ mov r4, r0
++
++ /* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
++ mov r0, #SIG_BLOCK
++ mov r1, #0
++ add r2, r4, #UCONTEXT_SIGMASK
++ bl PLTJMP(sigprocmask)
++
++#if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
++# ifdef __VFP_FP__
++ /* Store the VFP registers. */
++ /* Following instruction is fstmiax ip!, {d8-d15}. */
++ stc p11, cr8, [r0], #64
++ /* Store the floating-point status register. */
++ /* Following instruction is fmrx r2, fpscr. */
++ mrc p10, 7, r1, cr1, cr0, 0
++ str r1, [r0], #4
++# endif
++#endif
++#ifdef __IWMMXT__
++ /* Save the call-preserved iWMMXt registers. */
++ /* Following instructions are wstrd wr10, [r0], #8 (etc.) */
++ stcl p1, cr10, [r0], #8
++ stcl p1, cr11, [r0], #8
++ stcl p1, cr12, [r0], #8
++ stcl p1, cr13, [r0], #8
++ stcl p1, cr14, [r0], #8
++ stcl p1, cr15, [r0], #8
++#endif
++
++ /* Restore the clobbered R4 and LR. */
++ ldr r14, [r4, #MCONTEXT_ARM_LR]
++ ldr r4, [r4, #MCONTEXT_ARM_R4]
++
++ mov r0, #0
++ DO_RET(r14)
++
++END(__getcontext)
++weak_alias(__getcontext, getcontext)
+diff --git a/libc/sysdeps/linux/arm/makecontext.c b/libc/sysdeps/linux/arm/makecontext.c
+new file mode 100644
+index 0000000..d6ae6f0
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/makecontext.c
+@@ -0,0 +1,73 @@
++/* Copyright (C) 2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <stdarg.h>
++#include <ucontext.h>
++
++/* Number of arguments that go in registers. */
++#define NREG_ARGS 4
++
++/* Take a context previously prepared via getcontext() and set to
++ call func() with the given int only args. */
++void
++__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
++{
++ extern void __startcontext (void);
++ unsigned long *funcstack;
++ va_list vl;
++ unsigned long *regptr;
++ unsigned int reg;
++ int misaligned;
++
++ /* Start at the top of stack. */
++ funcstack = (unsigned long *) (ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
++
++ /* Ensure the stack stays eight byte aligned. */
++ misaligned = ((unsigned long) funcstack & 4) != 0;
++
++ if ((argc > NREG_ARGS) && (argc & 1) != 0)
++ misaligned = !misaligned;
++
++ if (misaligned)
++ funcstack -= 1;
++
++ va_start (vl, argc);
++
++ /* Reserve space for the on-stack arguments. */
++ if (argc > NREG_ARGS)
++ funcstack -= (argc - NREG_ARGS);
++
++ ucp->uc_mcontext.arm_sp = (unsigned long) funcstack;
++ ucp->uc_mcontext.arm_pc = (unsigned long) func;
++
++ /* Exit to startcontext() with the next context in R4 */
++ ucp->uc_mcontext.arm_r4 = (unsigned long) ucp->uc_link;
++ ucp->uc_mcontext.arm_lr = (unsigned long) __startcontext;
++
++ /* The first four arguments go into registers. */
++ regptr = &(ucp->uc_mcontext.arm_r0);
++
++ for (reg = 0; (reg < argc) && (reg < NREG_ARGS); reg++)
++ *regptr++ = va_arg (vl, unsigned long);
++
++ /* And the remainder on the stack. */
++ for (; reg < argc; reg++)
++ *funcstack++ = va_arg (vl, unsigned long);
++
++ va_end (vl);
++}
++weak_alias (__makecontext, makecontext)
+diff --git a/libc/sysdeps/linux/arm/setcontext.S b/libc/sysdeps/linux/arm/setcontext.S
+new file mode 100644
+index 0000000..a5c33a0
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/setcontext.S
+@@ -0,0 +1,76 @@
++/* Copyright (C) 2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++ .syntax unified
++ .text
++
++/* int setcontext (const ucontext_t *ucp) */
++
++ENTRY(__setcontext)
++ mov r4, r0
++
++#if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
++# ifdef __VFP_FP__
++ /* Following instruction is vldmia r0!, {d8-d15}. */
++ ldc p11, cr8, [r0], #64
++ /* Restore the floating-point status register. */
++ ldr r1, [r0], #4
++ /* Following instruction is fmxr fpscr, r1. */
++ mcr p10, 7, r1, cr1, cr0, 0
++# endif
++#endif
++
++#ifdef __IWMMXT__
++ /* Restore the call-preserved iWMMXt registers. */
++ /* Following instructions are wldrd wr10, [r0], #8 (etc.) */
++ ldcl p1, cr10, [r0], #8
++ ldcl p1, cr11, [r0], #8
++ ldcl p1, cr12, [r0], #8
++ ldcl p1, cr13, [r0], #8
++ ldcl p1, cr14, [r0], #8
++ ldcl p1, cr15, [r0], #8
++#endif
++
++ /* Now bring back the signal status. */
++ mov r0, #SIG_SETMASK
++ add r1, r4, #UCONTEXT_SIGMASK
++ mov r2, #0
++ bl PLTJMP(sigprocmask)
++
++ /* Loading r0-r3 makes makecontext easier. */
++ add r14, r4, #MCONTEXT_ARM_R0
++ ldmia r14, {r0-r11}
++ ldr r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
++ add r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
++ ldmia r14, {r14, pc}
++
++END(setcontext)
++weak_alias(__setcontext, setcontext)
++
++ /* Called when a makecontext() context returns. Start the
++ context in R4 or fall through to exit(). */
++ENTRY(__startcontext)
++ movs r0, r4
++ bne PLTJMP(__setcontext)
++
++ @ New context was 0 - exit
++ b PLTJMP(_exit)
++END(__startcontext)
+diff --git a/libc/sysdeps/linux/arm/swapcontext.S b/libc/sysdeps/linux/arm/swapcontext.S
+new file mode 100644
+index 0000000..ba6e31c
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/swapcontext.S
+@@ -0,0 +1,63 @@
++/* Copyright (C) 2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++ .syntax unified
++ .text
++
++/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
++
++ENTRY(swapcontext)
++
++ /* Have getcontext() do most of the work then fix up
++ LR afterwards. Save R3 to keep the stack aligned. */
++ push {r0,r1,r3,r14}
++ cfi_adjust_cfa_offset (16)
++ cfi_rel_offset (r0,0)
++ cfi_rel_offset (r1,4)
++ cfi_rel_offset (r3,8)
++ cfi_rel_offset (r14,12)
++
++ bl __getcontext
++ mov r4, r0
++
++ pop {r0,r1,r3,r14}
++ cfi_adjust_cfa_offset (-16)
++ cfi_restore (r0)
++ cfi_restore (r1)
++ cfi_restore (r3)
++ cfi_restore (r14)
++
++ /* Exit if getcontext() failed. */
++ cmp r4, #0
++ itt ne
++ movne r0, r4
++ RETINSTR(ne, r14)
++
++ /* Fix up LR and the PC. */
++ str r13,[r0, #MCONTEXT_ARM_SP]
++ str r14,[r0, #MCONTEXT_ARM_LR]
++ str r14,[r0, #MCONTEXT_ARM_PC]
++
++ /* And swap using swapcontext(). */
++ mov r0, r1
++ b __setcontext
++
++END(swapcontext)
+diff --git a/libc/sysdeps/linux/arm/ucontext_i.sym b/libc/sysdeps/linux/arm/ucontext_i.sym
+new file mode 100644
+index 0000000..9650322
+--- /dev/null
++++ b/libc/sysdeps/linux/arm/ucontext_i.sym
+@@ -0,0 +1,30 @@
++#include <inttypes.h>
++#include <signal.h>
++#include <stddef.h>
++#include <sys/ucontext.h>
++
++SIG_BLOCK
++SIG_SETMASK
++
++-- Offsets of the fields in the ucontext_t structure.
++#define ucontext(member) offsetof (ucontext_t, member)
++#define mcontext(member) ucontext (uc_mcontext.member)
++
++UCONTEXT_FLAGS ucontext (uc_flags)
++UCONTEXT_LINK ucontext (uc_link)
++UCONTEXT_STACK ucontext (uc_stack)
++UCONTEXT_MCONTEXT ucontext (uc_mcontext)
++UCONTEXT_SIGMASK ucontext (uc_sigmask)
++
++UCONTEXT_REGSPACE ucontext (uc_regspace)
++
++MCONTEXT_TRAP_NO mcontext (trap_no)
++MCONTEXT_ERROR_CODE mcontext (error_code)
++MCONTEXT_OLDMASK mcontext (oldmask)
++MCONTEXT_ARM_R0 mcontext (arm_r0)
++MCONTEXT_ARM_R4 mcontext (arm_r4)
++MCONTEXT_ARM_SP mcontext (arm_sp)
++MCONTEXT_ARM_LR mcontext (arm_lr)
++MCONTEXT_ARM_PC mcontext (arm_pc)
++MCONTEXT_ARM_CPSR mcontext (arm_cpsr)
++MCONTEXT_FAULT_ADDRESS mcontext (fault_address)
+diff --git a/libc/sysdeps/linux/i386/Makefile.arch b/libc/sysdeps/linux/i386/Makefile.arch
+index a3bf32f..e7fd28e 100644
+--- a/libc/sysdeps/linux/i386/Makefile.arch
++++ b/libc/sysdeps/linux/i386/Makefile.arch
+@@ -18,3 +18,7 @@ endif
+ ifneq ($(UCLIBC_HAS_THREADS_NATIVE),y)
+ SSRC += vfork.S clone.S
+ endif
++
++ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
++SSRC += makecontext.S setcontext.S getcontext.S swapcontext.S
++endif
+diff --git a/libc/sysdeps/linux/i386/getcontext.S b/libc/sysdeps/linux/i386/getcontext.S
+new file mode 100644
+index 0000000..3221b59
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/getcontext.S
+@@ -0,0 +1,84 @@
++/* Save current context.
++ Copyright (C) 2001-2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++ENTRY(__getcontext)
++ /* Load address of the context data structure. */
++ movl 4(%esp), %eax
++
++ /* Return value of getcontext. EAX is the only register whose
++ value is not preserved. */
++ movl $0, oEAX(%eax)
++
++ /* Save the 32-bit register values and the return address. */
++ movl %ecx, oECX(%eax)
++ movl %edx, oEDX(%eax)
++ movl %edi, oEDI(%eax)
++ movl %esi, oESI(%eax)
++ movl %ebp, oEBP(%eax)
++ movl (%esp), %ecx
++ movl %ecx, oEIP(%eax)
++ leal 4(%esp), %ecx /* Exclude the return address. */
++ movl %ecx, oESP(%eax)
++ movl %ebx, oEBX(%eax)
++
++ /* Save the FS segment register. We don't touch the GS register
++ since it is used for threads. */
++ xorl %edx, %edx
++ movw %fs, %dx
++ movl %edx, oFS(%eax)
++
++ /* We have separate floating-point register content memory on the
++ stack. We use the __fpregs_mem block in the context. Set the
++ links up correctly. */
++ leal oFPREGSMEM(%eax), %ecx
++ movl %ecx, oFPREGS(%eax)
++ /* Save the floating-point context. */
++ fnstenv (%ecx)
++ /* And load it right back since the processor changes the mask.
++ Intel thought this opcode to be used in interrupt handlers which
++ would block all exceptions. */
++ fldenv (%ecx)
++
++ /* Save the current signal mask. */
++ pushl %ebx
++ cfi_adjust_cfa_offset (4)
++ cfi_rel_offset (ebx, 0)
++ leal oSIGMASK(%eax), %edx
++ xorl %ecx, %ecx
++ movl $SIG_BLOCK, %ebx
++ movl $__NR_sigprocmask, %eax
++ ENTER_KERNEL
++ popl %ebx
++ cfi_adjust_cfa_offset (-4)
++ cfi_restore (ebx)
++ cmpl $-4095, %eax /* Check %eax for error. */
++ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
++
++ /* All done, return 0 for success. */
++ xorl %eax, %eax
++L(pseudo_end):
++ ret
++PSEUDO_END(__getcontext)
++
++weak_alias (__getcontext, getcontext)
+diff --git a/libc/sysdeps/linux/i386/makecontext.S b/libc/sysdeps/linux/i386/makecontext.S
+new file mode 100644
+index 0000000..d12799d
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/makecontext.S
+@@ -0,0 +1,123 @@
++/* Create new context.
++ Copyright (C) 2001,2002,2005,2007,2008,2009 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++ENTRY(__makecontext)
++ movl 4(%esp), %eax
++
++ /* Load the address of the function we are supposed to run. */
++ movl 8(%esp), %ecx
++
++ /* Compute the address of the stack. The information comes from
++ to us_stack element. */
++ movl oSS_SP(%eax), %edx
++ movl %ecx, oEIP(%eax)
++ addl oSS_SIZE(%eax), %edx
++
++ /* Remember the number of parameters for the exit handler since
++ it has to remove them. We store the number in the EBX register
++ which the function we will call must preserve. */
++ movl 12(%esp), %ecx
++ movl %ecx, oEBX(%eax)
++
++ /* Make room on the new stack for the parameters.
++ Room for the arguments, return address (== L(exitcode)) and
++ oLINK pointer is needed. One of the pointer sizes is subtracted
++ after aligning the stack. */
++ negl %ecx
++ leal -4(%edx,%ecx,4), %edx
++ negl %ecx
++
++ /* Align the stack. */
++ andl $0xfffffff0, %edx
++ subl $4, %edx
++
++ /* Store the future stack pointer. */
++ movl %edx, oESP(%eax)
++
++ /* Put the next context on the new stack (from the uc_link
++ element). */
++ movl oLINK(%eax), %eax
++ movl %eax, 4(%edx,%ecx,4)
++
++ /* Copy all the parameters. */
++ jecxz 2f
++1: movl 12(%esp,%ecx,4), %eax
++ movl %eax, (%edx,%ecx,4)
++ decl %ecx
++ jnz 1b
++2:
++
++ /* If the function we call returns we must continue with the
++ context which is given in the uc_link element. To do this
++ set the return address for the function the user provides
++ to a little bit of helper code which does the magic (see
++ below). */
++#ifdef __PIC__
++ call 1f
++ cfi_adjust_cfa_offset (4)
++1: popl %ecx
++ cfi_adjust_cfa_offset (-4)
++ addl $L(exitcode)-1b, %ecx
++ movl %ecx, (%edx)
++#else
++ movl $L(exitcode), (%edx)
++#endif
++ /* 'makecontext' returns no value. */
++L(pseudo_end):
++ ret
++
++ /* This is the helper code which gets called if a function which
++ is registered with 'makecontext' returns. In this case we
++ have to install the context listed in the uc_link element of
++ the context 'makecontext' manipulated at the time of the
++ 'makecontext' call. If the pointer is NULL the process must
++ terminate. */
++ cfi_endproc
++L(exitcode):
++ /* This removes the parameters passed to the function given to
++ 'makecontext' from the stack. EBX contains the number of
++ parameters (see above). */
++ leal (%esp,%ebx,4), %esp
++
++#ifdef __PIC__
++ call 1f
++1: popl %ebx
++ addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
++#endif
++ cmpl $0, (%esp) /* Check the next context. */
++ je 2f /* If it is zero exit. */
++
++ call JUMPTARGET(__setcontext)
++ /* If this returns (which can happen if the syscall fails) we'll
++ exit the program with the return error value (-1). */
++
++ movl %eax, (%esp)
++2: call HIDDEN_JUMPTARGET(exit)
++ /* The 'exit' call should never return. In case it does cause
++ the process to terminate. */
++ hlt
++ cfi_startproc
++END(__makecontext)
++
++weak_alias (__makecontext, makecontext)
+diff --git a/libc/sysdeps/linux/i386/setcontext.S b/libc/sysdeps/linux/i386/setcontext.S
+new file mode 100644
+index 0000000..ae953cc
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/setcontext.S
+@@ -0,0 +1,96 @@
++/* Install given context.
++ Copyright (C) 2001-2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++ENTRY(__setcontext)
++ /* Load address of the context data structure. */
++ movl 4(%esp), %eax
++
++ /* Get the current signal mask. Note that we preserve EBX in case
++ the system call fails and we return from the function with an
++ error. */
++ pushl %ebx
++ cfi_adjust_cfa_offset (4)
++ xorl %edx, %edx
++ leal oSIGMASK(%eax), %ecx
++ movl $SIG_SETMASK, %ebx
++ cfi_rel_offset (ebx, 0)
++ movl $__NR_sigprocmask, %eax
++ ENTER_KERNEL
++ popl %ebx
++ cfi_adjust_cfa_offset (-4)
++ cfi_restore (ebx)
++ cmpl $-4095, %eax /* Check %eax for error. */
++ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
++
++ /* EAX was modified, reload it. */
++ movl 4(%esp), %eax
++
++ /* Restore the floating-point context. Not the registers, only the
++ rest. */
++ movl oFPREGS(%eax), %ecx
++ fldenv (%ecx)
++
++ /* Restore the FS segment register. We don't touch the GS register
++ since it is used for threads. */
++ movl oFS(%eax), %ecx
++ movw %cx, %fs
++
++ /* Fetch the address to return to. */
++ movl oEIP(%eax), %ecx
++
++ /* Load the new stack pointer. */
++ cfi_def_cfa (eax, 0)
++ cfi_offset (edi, oEDI)
++ cfi_offset (esi, oESI)
++ cfi_offset (ebp, oEBP)
++ cfi_offset (ebx, oEBX)
++ cfi_offset (edx, oEDX)
++ cfi_offset (ecx, oECX)
++ movl oESP(%eax), %esp
++
++ /* Push the return address on the new stack so we can return there. */
++ pushl %ecx
++
++ /* Load the values of all the 32-bit registers (except ESP).
++ Since we are loading from EAX, it must be last. */
++ movl oEDI(%eax), %edi
++ movl oESI(%eax), %esi
++ movl oEBP(%eax), %ebp
++ movl oEBX(%eax), %ebx
++ movl oEDX(%eax), %edx
++ movl oECX(%eax), %ecx
++ movl oEAX(%eax), %eax
++
++ /* End FDE here, we fall into another context. */
++ cfi_endproc
++ cfi_startproc
++
++ /* The following 'ret' will pop the address of the code and jump
++ to it. */
++
++L(pseudo_end):
++ ret
++PSEUDO_END(__setcontext)
++
++weak_alias (__setcontext, setcontext)
+diff --git a/libc/sysdeps/linux/i386/swapcontext.S b/libc/sysdeps/linux/i386/swapcontext.S
+new file mode 100644
+index 0000000..ee5d0e4
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/swapcontext.S
+@@ -0,0 +1,110 @@
++/* Save current context and install the given one.
++ Copyright (C) 2001-2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++ENTRY(__swapcontext)
++ /* Load address of the context data structure we save in. */
++ movl 4(%esp), %eax
++
++ /* Return value of swapcontext. EAX is the only register whose
++ value is not preserved. */
++ movl $0, oEAX(%eax)
++
++ /* Save the 32-bit register values and the return address. */
++ movl %ecx, oECX(%eax)
++ movl %edx, oEDX(%eax)
++ movl %edi, oEDI(%eax)
++ movl %esi, oESI(%eax)
++ movl %ebp, oEBP(%eax)
++ movl (%esp), %ecx
++ movl %ecx, oEIP(%eax)
++ leal 4(%esp), %ecx
++ movl %ecx, oESP(%eax)
++ movl %ebx, oEBX(%eax)
++
++ /* Save the FS segment register. */
++ xorl %edx, %edx
++ movw %fs, %dx
++ movl %edx, oFS(%eax)
++
++ /* We have separate floating-point register content memory on the
++ stack. We use the __fpregs_mem block in the context. Set the
++ links up correctly. */
++ leal oFPREGSMEM(%eax), %ecx
++ movl %ecx, oFPREGS(%eax)
++ /* Save the floating-point context. */
++ fnstenv (%ecx)
++
++ /* Load address of the context data structure we have to load. */
++ movl 8(%esp), %ecx
++
++ /* Save the current signal mask and install the new one. */
++ pushl %ebx
++ leal oSIGMASK(%eax), %edx
++ leal oSIGMASK(%ecx), %ecx
++ movl $SIG_SETMASK, %ebx
++ movl $__NR_sigprocmask, %eax
++ ENTER_KERNEL
++ popl %ebx
++ cmpl $-4095, %eax /* Check %eax for error. */
++ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
++
++ /* EAX was modified, reload it. */
++ movl 8(%esp), %eax
++
++ /* Restore the floating-point context. Not the registers, only the
++ rest. */
++ movl oFPREGS(%eax), %ecx
++ fldenv (%ecx)
++
++ /* Restore the FS segment register. We don't touch the GS register
++ since it is used for threads. */
++ movl oFS(%eax), %edx
++ movw %dx, %fs
++
++ /* Fetch the address to return to. */
++ movl oEIP(%eax), %ecx
++
++ /* Load the new stack pointer. */
++ movl oESP(%eax), %esp
++
++ /* Push the return address on the new stack so we can return there. */
++ pushl %ecx
++
++ /* Load the values of all the 32-bit registers (except ESP).
++ Since we are loading from EAX, it must be last. */
++ movl oEDI(%eax), %edi
++ movl oESI(%eax), %esi
++ movl oEBP(%eax), %ebp
++ movl oEBX(%eax), %ebx
++ movl oEDX(%eax), %edx
++ movl oECX(%eax), %ecx
++ movl oEAX(%eax), %eax
++
++ /* The following 'ret' will pop the address of the code and jump
++ to it. */
++L(pseudo_end):
++ ret
++PSEUDO_END(__swapcontext)
++
++weak_alias (__swapcontext, swapcontext)
+diff --git a/libc/sysdeps/linux/i386/ucontext_i.sym b/libc/sysdeps/linux/i386/ucontext_i.sym
+new file mode 100644
+index 0000000..b11a550
+--- /dev/null
++++ b/libc/sysdeps/linux/i386/ucontext_i.sym
+@@ -0,0 +1,30 @@
++#include <stddef.h>
++#include <signal.h>
++#include <sys/ucontext.h>
++
++--
++
++SIG_BLOCK
++SIG_SETMASK
++
++#define ucontext(member) offsetof (ucontext_t, member)
++#define mcontext(member) ucontext (uc_mcontext.member)
++#define mreg(reg) mcontext (gregs[REG_##reg])
++
++oLINK ucontext (uc_link)
++oSS_SP ucontext (uc_stack.ss_sp)
++oSS_SIZE ucontext (uc_stack.ss_size)
++oGS mreg (GS)
++oFS mreg (FS)
++oEDI mreg (EDI)
++oESI mreg (ESI)
++oEBP mreg (EBP)
++oESP mreg (ESP)
++oEBX mreg (EBX)
++oEDX mreg (EDX)
++oECX mreg (ECX)
++oEAX mreg (EAX)
++oEIP mreg (EIP)
++oFPREGS mcontext (fpregs)
++oSIGMASK ucontext (uc_sigmask)
++oFPREGSMEM ucontext (__fpregs_mem)
+diff --git a/libc/sysdeps/linux/mips/Makefile.arch b/libc/sysdeps/linux/mips/Makefile.arch
+index fce99f8..00b9331 100644
+--- a/libc/sysdeps/linux/mips/Makefile.arch
++++ b/libc/sysdeps/linux/mips/Makefile.arch
+@@ -27,3 +27,7 @@ ASFLAGS-syscall_error.S += -D_LIBC_REENTRANT
+
+ ARCH_HEADERS := sgidefs.h
+ # regdef.h
++
++ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
++SSRC += makecontext.S setcontext.S getcontext.S swapcontext.S
++endif
+diff --git a/libc/sysdeps/linux/mips/getcontext.S b/libc/sysdeps/linux/mips/getcontext.S
+new file mode 100644
+index 0000000..c4ad081
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/getcontext.S
+@@ -0,0 +1,148 @@
++/* Save current context.
++ Copyright (C) 2009 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library. If not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++#include <sys/asm.h>
++#include <sys/fpregdef.h>
++#include <sys/regdef.h>
++
++#include "ucontext_i.h"
++
++/* int getcontext (ucontext_t *ucp) */
++
++ .text
++LOCALSZ = 0
++MASK = 0x00000000
++#ifdef __PIC__
++LOCALSZ = 1 /* save gp */
++# if _MIPS_SIM != _ABIO32
++MASK = 0x10000000
++# endif
++#endif
++FRAMESZ = ((LOCALSZ * SZREG) + ALSZ) & ALMASK
++GPOFF = FRAMESZ - (1 * SZREG)
++
++NESTED (__getcontext, FRAMESZ, ra)
++ .mask MASK, 0
++ .fmask 0x00000000, 0
++
++#ifdef __PIC__
++ SETUP_GP
++
++ move a2, sp
++# define _SP a2
++
++# if _MIPS_SIM != _ABIO32
++ move a3, gp
++# define _GP a3
++# endif
++
++ PTR_ADDIU sp, -FRAMESZ
++ SETUP_GP64 (GPOFF, __getcontext)
++ SAVE_GP (GPOFF)
++
++#else /* ! __PIC__ */
++# define _SP sp
++# define _GP gp
++
++#endif /* ! __PIC__ */
++
++#ifdef PROF
++ .set noat
++ move AT, ra
++ jal _mcount
++ .set at
++#endif
++
++ /* Store a magic flag. */
++ li v1, 1
++ REG_S v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
++
++ REG_S s0, (16 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s1, (17 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s2, (18 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s3, (19 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s4, (20 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s5, (21 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s6, (22 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s7, (23 * SZREG + MCONTEXT_GREGS)(a0)
++#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
++ REG_S _GP, (28 * SZREG + MCONTEXT_GREGS)(a0)
++#endif
++ REG_S _SP, (29 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S fp, (30 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S ra, (31 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S ra, MCONTEXT_PC(a0)
++
++#ifdef __mips_hard_float
++# if _MIPS_SIM == _ABI64
++ s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
++
++# else /* _MIPS_SIM != _ABI64 */
++ s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
++
++# endif /* _MIPS_SIM != _ABI64 */
++
++ cfc1 v1, fcr31
++ sw v1, MCONTEXT_FPC_CSR(a0)
++#endif /* __mips_hard_float */
++
++/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
++ li a3, _NSIG8
++ PTR_ADDU a2, a0, UCONTEXT_SIGMASK
++ move a1, zero
++ li a0, SIG_BLOCK
++
++ li v0, SYS_ify (rt_sigprocmask)
++ syscall
++ bnez a3, 99f
++
++#ifdef __PIC__
++ RESTORE_GP64
++ PTR_ADDIU sp, FRAMESZ
++#endif
++ move v0, zero
++ jr ra
++
++99:
++#ifdef __PIC__
++ PTR_LA t9, JUMPTARGET (__syscall_error)
++ RESTORE_GP64
++ PTR_ADDIU sp, FRAMESZ
++ jr t9
++
++#else /* ! __PIC__ */
++
++ j JUMPTARGET (__syscall_error)
++#endif /* ! __PIC__ */
++PSEUDO_END (__getcontext)
++
++weak_alias (__getcontext, getcontext)
+diff --git a/libc/sysdeps/linux/mips/kernel_rt_sigframe.h b/libc/sysdeps/linux/mips/kernel_rt_sigframe.h
+new file mode 100644
+index 0000000..77ffaf6
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/kernel_rt_sigframe.h
+@@ -0,0 +1,10 @@
++/* Linux kernel RT signal frame. */
++typedef struct kernel_rt_sigframe
++ {
++ uint32_t rs_ass[4];
++ uint32_t rs_code[2];
++ siginfo_t rs_info;
++ struct ucontext rs_uc;
++ uint32_t rs_altcode[8] __attribute__ ((__aligned__ (1 << 7)));
++ }
++kernel_rt_sigframe_t;
+diff --git a/libc/sysdeps/linux/mips/makecontext.S b/libc/sysdeps/linux/mips/makecontext.S
+new file mode 100644
+index 0000000..6427339
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/makecontext.S
+@@ -0,0 +1,188 @@
++/* Modify saved context.
++ Copyright (C) 2009 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library. If not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++#include <sys/asm.h>
++#include <sys/fpregdef.h>
++#include <sys/regdef.h>
++
++#include "ucontext_i.h"
++
++/* int makecontext (ucontext_t *ucp, (void *func) (), int argc, ...) */
++
++ .text
++LOCALSZ = 0
++ARGSZ = 0
++MASK = 0x00000000
++#ifdef __PIC__
++LOCALSZ = 1 /* save gp */
++#endif
++#if _MIPS_SIM != _ABIO32
++ARGSZ = 5 /* save a3-a7 */
++# ifdef __PIC__
++MASK = 0x10000000
++# endif
++#endif
++FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
++GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
++#if _MIPS_SIM != _ABIO32
++A3OFF = FRAMESZ - (5 * SZREG) /* callee-allocated */
++A4OFF = FRAMESZ - (4 * SZREG)
++A5OFF = FRAMESZ - (3 * SZREG)
++A6OFF = FRAMESZ - (2 * SZREG)
++A7OFF = FRAMESZ - (1 * SZREG)
++NARGREGS = 8
++#else
++A3OFF = FRAMESZ + (3 * SZREG) /* caller-allocated */
++NARGREGS = 4
++#endif
++
++NESTED (__makecontext, FRAMESZ, ra)
++ .mask MASK, -(ARGSZ * SZREG)
++ .fmask 0x00000000, 0
++
++98:
++#ifdef __PIC__
++ SETUP_GP
++#endif
++
++ PTR_ADDIU sp, -FRAMESZ
++
++#ifdef __PIC__
++ SETUP_GP64 (GPOFF, __makecontext)
++ SAVE_GP (GPOFF)
++#endif
++
++#ifdef PROF
++ .set noat
++ move AT, ra
++ jal _mcount
++ .set at
++#endif
++
++ /* Store args to be passed. */
++ REG_S a3, A3OFF(sp)
++#if _MIPS_SIM != _ABIO32
++ REG_S a4, A4OFF(sp)
++ REG_S a5, A5OFF(sp)
++ REG_S a6, A6OFF(sp)
++ REG_S a7, A7OFF(sp)
++#endif
++
++ /* Store a magic flag. */
++ li v1, 1
++ REG_S v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
++
++ /* Set up the stack. */
++ PTR_L t0, STACK_SP(a0)
++ PTR_L t2, STACK_SIZE(a0)
++ PTR_ADDIU t1, sp, A3OFF
++ PTR_ADDU t0, t2
++ and t0, ALMASK
++ blez a2, 2f /* no arguments */
++
++ /* Store register arguments. */
++ PTR_ADDIU t2, a0, MCONTEXT_GREGS + 4 * SZREG
++ move t3, zero
++0:
++ addiu t3, 1
++ REG_L v1, (t1)
++ PTR_ADDIU t1, SZREG
++ REG_S v1, (t2)
++ PTR_ADDIU t2, SZREG
++ bgeu t3, a2, 2f /* all done */
++ bltu t3, NARGREGS, 0b /* next */
++
++ /* Make room for stack arguments. */
++ PTR_SUBU t2, a2, t3
++ PTR_SLL t2, 3
++ PTR_SUBU t0, t2
++ and t0, ALMASK
++
++ /* Store stack arguments. */
++ move t2, t0
++1:
++ addiu t3, 1
++ REG_L v1, (t1)
++ PTR_ADDIU t1, SZREG
++ REG_S v1, (t2)
++ PTR_ADDIU t2, SZREG
++ bltu t3, a2, 1b /* next */
++
++2:
++#if _MIPS_SIM == _ABIO32
++ /* Make room for a0-a3 storage. */
++ PTR_ADDIU t0, -(NARGSAVE * SZREG)
++#endif
++ PTR_L v1, UCONTEXT_LINK(a0)
++#ifdef __PIC__
++ PTR_ADDIU t9, 99f - 98b
++#else
++ PTR_LA t9, 99f
++#endif
++ REG_S t0, (29 * SZREG + MCONTEXT_GREGS)(a0) /* sp */
++ REG_S v1, (16 * SZREG + MCONTEXT_GREGS)(a0) /* s0 */
++#ifdef __PIC__
++ REG_S gp, (17 * SZREG + MCONTEXT_GREGS)(a0) /* s1 */
++#endif
++ REG_S t9, (31 * SZREG + MCONTEXT_GREGS)(a0) /* ra */
++ REG_S a1, MCONTEXT_PC(a0)
++
++#ifdef __PIC__
++ RESTORE_GP64
++ PTR_ADDIU sp, FRAMESZ
++#endif
++ jr ra
++
++99:
++#ifdef __PIC__
++ move gp, s1
++#endif
++ move a0, zero
++ beqz s0, 0f
++
++ /* setcontext (ucp) */
++ move a0, s0
++#ifdef __PIC__
++ PTR_LA t9, JUMPTARGET (__setcontext)
++ jalr t9
++# if _MIPS_SIM == _ABIO32
++ move gp, s1
++# endif
++#else
++ jal JUMPTARGET (__setcontext)
++#endif
++ move a0, v0
++
++0:
++ /* exit (a0) */
++#ifdef __PIC__
++ PTR_LA t9, HIDDEN_JUMPTARGET (exit)
++ jalr t9
++#else
++ jal HIDDEN_JUMPTARGET (exit)
++#endif
++
++ /* You don't exist, you won't feel anything. */
++1:
++ lb zero, (zero)
++ b 1b
++PSEUDO_END (__makecontext)
++
++weak_alias (__makecontext, makecontext)
+diff --git a/libc/sysdeps/linux/mips/setcontext.S b/libc/sysdeps/linux/mips/setcontext.S
+new file mode 100644
+index 0000000..d3cde0e
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/setcontext.S
+@@ -0,0 +1,191 @@
++/* Set current context.
++ Copyright (C) 2009 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library. If not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++#include <sys/asm.h>
++#include <sys/fpregdef.h>
++#include <sys/regdef.h>
++
++#include "ucontext_i.h"
++
++/* int setcontext (const ucontext_t *ucp) */
++
++ .text
++LOCALSZ = 0
++ARGSZ = 0
++MASK = 0x00000000
++#ifdef __PIC__
++LOCALSZ = 1 /* save gp */
++#endif
++#if _MIPS_SIM != _ABIO32
++ARGSZ = 1 /* save a0 */
++# ifdef __PIC__
++MASK = 0x10000000
++# endif
++#endif
++FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
++GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
++#if _MIPS_SIM != _ABIO32
++A0OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
++#else
++A0OFF = FRAMESZ + (0 * SZREG) /* caller-allocated */
++#endif
++
++NESTED (__setcontext, FRAMESZ, ra)
++ .mask MASK, -(ARGSZ * SZREG)
++ .fmask 0x00000000, 0
++
++#ifdef __PIC__
++ SETUP_GP
++#endif
++
++ PTR_ADDIU sp, -FRAMESZ
++
++#ifdef __PIC__
++ SETUP_GP64 (GPOFF, __setcontext)
++ SAVE_GP (GPOFF)
++#endif
++
++#ifdef PROF
++ .set noat
++ move AT, ra
++ jal _mcount
++ .set at
++#endif
++
++ /* Check for the magic flag. */
++ li v0, 1
++ REG_L v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
++ bne v0, v1, 98f
++
++ REG_S a0, A0OFF(sp)
++
++/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
++ li a3, _NSIG8
++ move a2, zero
++ PTR_ADDU a1, a0, UCONTEXT_SIGMASK
++ li a0, SIG_SETMASK
++
++ li v0, SYS_ify (rt_sigprocmask)
++ syscall
++ bnez a3, 99f
++
++ REG_L v0, A0OFF(sp)
++
++#ifdef __mips_hard_float
++# if _MIPS_SIM == _ABI64
++ l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
++
++# else /* _MIPS_SIM != _ABI64 */
++ l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
++
++# endif /* _MIPS_SIM != _ABI64 */
++
++ lw v1, MCONTEXT_FPC_CSR(v0)
++ ctc1 v1, fcr31
++#endif /* __mips_hard_float */
++
++ /* Note the contents of argument registers will be random
++ unless makecontext() has been called. */
++ REG_L a0, (4 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a1, (5 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a2, (6 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a3, (7 * SZREG + MCONTEXT_GREGS)(v0)
++#if _MIPS_SIM != _ABIO32
++ REG_L a4, (8 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a5, (9 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a6, (10 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a7, (11 * SZREG + MCONTEXT_GREGS)(v0)
++#endif
++
++ REG_L s0, (16 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s1, (17 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s2, (18 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s3, (19 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s4, (20 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s5, (21 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s6, (22 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s7, (23 * SZREG + MCONTEXT_GREGS)(v0)
++#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
++ REG_L gp, (28 * SZREG + MCONTEXT_GREGS)(v0)
++#endif
++ REG_L sp, (29 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L fp, (30 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L ra, (31 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L t9, MCONTEXT_PC(v0)
++
++ move v0, zero
++ jr t9
++
++98:
++ /* This is a context obtained from a signal handler.
++ Perform a full restore by pushing the context
++ passed onto a simulated signal frame on the stack
++ and call the signal return syscall as if a signal
++ handler exited normally. */
++ PTR_ADDIU sp, -((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
++
++ /* Only ucontext is referred to from rt_sigreturn,
++ copy it. */
++ PTR_ADDIU t1, sp, RT_SIGFRAME_UCONTEXT
++ li t3, ((UCONTEXT_SIZE + SZREG - 1) / SZREG) - 1
++0:
++ REG_L t2, (a0)
++ PTR_ADDIU a0, SZREG
++ REG_S t2, (t1)
++ PTR_ADDIU t1, SZREG
++ .set noreorder
++ bgtz t3, 0b
++ addiu t3, -1
++ .set reorder
++
++/* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */
++ li v0, SYS_ify (rt_sigreturn)
++ syscall
++
++ /* Restore the stack and fall through to the error
++ path. Successful rt_sigreturn never returns to
++ its calling place. */
++ PTR_ADDIU sp, ((RT_SIGFRAME_SIZE + ALSZ) & ALMASK)
++99:
++#ifdef __PIC__
++ PTR_LA t9, JUMPTARGET (__syscall_error)
++ RESTORE_GP64
++ PTR_ADDIU sp, FRAMESZ
++ jr t9
++
++#else /* ! __PIC__ */
++
++ j JUMPTARGET (__syscall_error)
++#endif /* ! __PIC__ */
++PSEUDO_END (__setcontext)
++
++weak_alias (__setcontext, setcontext)
+diff --git a/libc/sysdeps/linux/mips/swapcontext.S b/libc/sysdeps/linux/mips/swapcontext.S
+new file mode 100644
+index 0000000..c7ac19b
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/swapcontext.S
+@@ -0,0 +1,211 @@
++/* Save and set current context.
++ Copyright (C) 2009 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library. If not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++#include <sys/asm.h>
++#include <sys/fpregdef.h>
++#include <sys/regdef.h>
++
++#include "ucontext_i.h"
++
++/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
++
++ .text
++LOCALSZ = 0
++ARGSZ = 0
++MASK = 0x00000000
++#ifdef __PIC__
++LOCALSZ = 1 /* save gp */
++#endif
++#if _MIPS_SIM != _ABIO32
++ARGSZ = 1 /* save a1 */
++# ifdef __PIC__
++MASK = 0x10000000
++# endif
++#endif
++FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
++GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
++#if _MIPS_SIM != _ABIO32
++A1OFF = FRAMESZ - (1 * SZREG) /* callee-allocated */
++#else
++A1OFF = FRAMESZ + (1 * SZREG) /* caller-allocated */
++#endif
++
++NESTED (__swapcontext, FRAMESZ, ra)
++ .mask MASK, -(ARGSZ * SZREG)
++ .fmask 0x00000000, 0
++
++#ifdef __PIC__
++ SETUP_GP
++
++ move a2, sp
++# define _SP a2
++
++# if _MIPS_SIM != _ABIO32
++ move a3, gp
++# define _GP a3
++# endif
++
++ PTR_ADDIU sp, -FRAMESZ
++ SETUP_GP64 (GPOFF, __swapcontext)
++ SAVE_GP (GPOFF)
++
++#else /* ! __PIC__ */
++# define _SP sp
++# define _GP gp
++
++#endif /* ! __PIC__ */
++
++#ifdef PROF
++ .set noat
++ move AT, ra
++ jal _mcount
++ .set at
++#endif
++
++ /* Store a magic flag. */
++ li v1, 1
++ REG_S v1, (0 * SZREG + MCONTEXT_GREGS)(a0) /* zero */
++
++ REG_S s0, (16 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s1, (17 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s2, (18 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s3, (19 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s4, (20 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s5, (21 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s6, (22 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S s7, (23 * SZREG + MCONTEXT_GREGS)(a0)
++#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
++ REG_S _GP, (28 * SZREG + MCONTEXT_GREGS)(a0)
++#endif
++ REG_S _SP, (29 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S fp, (30 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S ra, (31 * SZREG + MCONTEXT_GREGS)(a0)
++ REG_S ra, MCONTEXT_PC(a0)
++
++#ifdef __mips_hard_float
++# if _MIPS_SIM == _ABI64
++ s.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(a0)
++
++# else /* _MIPS_SIM != _ABI64 */
++ s.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(a0)
++ s.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(a0)
++
++# endif /* _MIPS_SIM != _ABI64 */
++
++ cfc1 v1, fcr31
++ sw v1, MCONTEXT_FPC_CSR(a0)
++#endif /* __mips_hard_float */
++
++ REG_S a1, A1OFF(sp)
++
++/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
++ li a3, _NSIG8
++ PTR_ADDU a2, a0, UCONTEXT_SIGMASK
++ PTR_ADDU a1, a1, UCONTEXT_SIGMASK
++ li a0, SIG_SETMASK
++
++ li v0, SYS_ify (rt_sigprocmask)
++ syscall
++ bnez a3, 99f
++
++ REG_L v0, A1OFF(sp)
++
++#ifdef __mips_hard_float
++# if _MIPS_SIM == _ABI64
++ l.d fs0, (24 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs1, (25 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs2, (26 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs3, (27 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs5, (29 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs6, (30 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs7, (31 * SZREG + MCONTEXT_FPREGS)(v0)
++
++# else /* _MIPS_SIM != _ABI64 */
++ l.d fs0, (20 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs1, (22 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs2, (24 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs3, (26 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs4, (28 * SZREG + MCONTEXT_FPREGS)(v0)
++ l.d fs5, (30 * SZREG + MCONTEXT_FPREGS)(v0)
++
++# endif /* _MIPS_SIM != _ABI64 */
++
++ lw v1, MCONTEXT_FPC_CSR(v0)
++ ctc1 v1, fcr31
++#endif /* __mips_hard_float */
++
++ /* Note the contents of argument registers will be random
++ unless makecontext() has been called. */
++ REG_L a0, (4 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a1, (5 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a2, (6 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a3, (7 * SZREG + MCONTEXT_GREGS)(v0)
++#if _MIPS_SIM != _ABIO32
++ REG_L a4, (8 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a5, (9 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a6, (10 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L a7, (11 * SZREG + MCONTEXT_GREGS)(v0)
++#endif
++
++ REG_L s0, (16 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s1, (17 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s2, (18 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s3, (19 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s4, (20 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s5, (21 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s6, (22 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L s7, (23 * SZREG + MCONTEXT_GREGS)(v0)
++#if ! defined (__PIC__) || _MIPS_SIM != _ABIO32
++ REG_L gp, (28 * SZREG + MCONTEXT_GREGS)(v0)
++#endif
++ REG_L sp, (29 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L fp, (30 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L ra, (31 * SZREG + MCONTEXT_GREGS)(v0)
++ REG_L t9, MCONTEXT_PC(v0)
++
++ move v0, zero
++ jr t9
++
++99:
++#ifdef __PIC__
++ PTR_LA t9, JUMPTARGET (__syscall_error)
++ RESTORE_GP64
++ PTR_ADDIU sp, FRAMESZ
++ jr t9
++
++#else /* ! __PIC__ */
++
++ j JUMPTARGET (__syscall_error)
++#endif /* ! __PIC__ */
++PSEUDO_END (__swapcontext)
++
++weak_alias (__swapcontext, swapcontext)
+diff --git a/libc/sysdeps/linux/mips/ucontext_i.sym b/libc/sysdeps/linux/mips/ucontext_i.sym
+new file mode 100644
+index 0000000..f14b886
+--- /dev/null
++++ b/libc/sysdeps/linux/mips/ucontext_i.sym
+@@ -0,0 +1,52 @@
++#include <inttypes.h>
++#include <signal.h>
++#include <stddef.h>
++#include <sys/ucontext.h>
++
++#include <kernel_rt_sigframe.h>
++
++-- Constants used by the rt_sigprocmask call.
++
++SIG_BLOCK
++SIG_SETMASK
++
++_NSIG8 (_NSIG / 8)
++
++-- Offsets of the fields in the kernel rt_sigframe_t structure.
++#define rt_sigframe(member) offsetof (kernel_rt_sigframe_t, member)
++
++RT_SIGFRAME_UCONTEXT rt_sigframe (rs_uc)
++
++RT_SIGFRAME_SIZE sizeof (kernel_rt_sigframe_t)
++
++-- Offsets of the fields in the ucontext_t structure.
++#define ucontext(member) offsetof (ucontext_t, member)
++#define stack(member) ucontext (uc_stack.member)
++#define mcontext(member) ucontext (uc_mcontext.member)
++
++UCONTEXT_FLAGS ucontext (uc_flags)
++UCONTEXT_LINK ucontext (uc_link)
++UCONTEXT_STACK ucontext (uc_stack)
++UCONTEXT_MCONTEXT ucontext (uc_mcontext)
++UCONTEXT_SIGMASK ucontext (uc_sigmask)
++
++STACK_SP stack (ss_sp)
++STACK_SIZE stack (ss_size)
++STACK_FLAGS stack (ss_flags)
++
++MCONTEXT_GREGS mcontext (gregs)
++MCONTEXT_FPREGS mcontext (fpregs)
++MCONTEXT_MDHI mcontext (mdhi)
++MCONTEXT_HI1 mcontext (hi1)
++MCONTEXT_HI2 mcontext (hi2)
++MCONTEXT_HI3 mcontext (hi3)
++MCONTEXT_MDLO mcontext (mdlo)
++MCONTEXT_LO1 mcontext (lo1)
++MCONTEXT_LO2 mcontext (lo2)
++MCONTEXT_LO3 mcontext (lo3)
++MCONTEXT_PC mcontext (pc)
++MCONTEXT_FPC_CSR mcontext (fpc_csr)
++MCONTEXT_USED_MATH mcontext (used_math)
++MCONTEXT_DSP mcontext (dsp)
++
++UCONTEXT_SIZE sizeof (ucontext_t)
+diff --git a/libc/sysdeps/linux/x86_64/Makefile.arch b/libc/sysdeps/linux/x86_64/Makefile.arch
+index 7491d92..93b8259 100644
+--- a/libc/sysdeps/linux/x86_64/Makefile.arch
++++ b/libc/sysdeps/linux/x86_64/Makefile.arch
+@@ -20,3 +20,8 @@ ifeq ($(UCLIBC_HAS_TLS),y)
+ SSRC += sched_getcpu.S
+ endif
+ endif
++
++ifeq ($(UCLIBC_HAS_CONTEXT_FUNCS),y)
++CSRC += makecontext.c
++SSRC += setcontext.S getcontext.S swapcontext.S __start_context.S
++endif
+diff --git a/libc/sysdeps/linux/x86_64/__start_context.S b/libc/sysdeps/linux/x86_64/__start_context.S
+new file mode 100644
+index 0000000..9f2ee23
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/__start_context.S
+@@ -0,0 +1,49 @@
++/* Copyright (C) 2002-2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++/* This is the helper code which gets called if a function which is
++ registered with 'makecontext' returns. In this case we have to
++ install the context listed in the uc_link element of the context
++ 'makecontext' manipulated at the time of the 'makecontext' call.
++ If the pointer is NULL the process must terminate. */
++
++
++ENTRY(__start_context)
++ /* This removes the parameters passed to the function given to
++ 'makecontext' from the stack. RBX contains the address
++ on the stack pointer for the next context. */
++ movq %rbx, %rsp
++
++ popq %rdi /* This is the next context. */
++ cfi_adjust_cfa_offset(-8)
++ testq %rdi, %rdi
++ je 2f /* If it is zero exit. */
++
++ call JUMPTARGET(__setcontext)
++ /* If this returns (which can happen if the syscall fails) we'll
++ exit the program with the return error value (-1). */
++ movq %rax,%rdi
++
++2:
++ call HIDDEN_JUMPTARGET(exit)
++ /* The 'exit' call should never return. In case it does cause
++ the process to terminate. */
++ hlt
++END(__start_context)
+diff --git a/libc/sysdeps/linux/x86_64/getcontext.S b/libc/sysdeps/linux/x86_64/getcontext.S
+new file mode 100644
+index 0000000..dcebc4f
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/getcontext.S
+@@ -0,0 +1,88 @@
++/* Save current context.
++ Copyright (C) 2002-2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++/* int __getcontext (ucontext_t *ucp)
++
++ Saves the machine context in UCP such that when it is activated,
++ it appears as if __getcontext() returned again.
++
++ This implementation is intended to be used for *synchronous* context
++ switches only. Therefore, it does not have to save anything
++ other than the PRESERVED state. */
++
++
++ENTRY(__getcontext)
++ /* Save the preserved registers, the registers used for passing
++ args, and the return address. */
++ movq %rbx, oRBX(%rdi)
++ movq %rbp, oRBP(%rdi)
++ movq %r12, oR12(%rdi)
++ movq %r13, oR13(%rdi)
++ movq %r14, oR14(%rdi)
++ movq %r15, oR15(%rdi)
++
++ movq %rdi, oRDI(%rdi)
++ movq %rsi, oRSI(%rdi)
++ movq %rdx, oRDX(%rdi)
++ movq %rcx, oRCX(%rdi)
++ movq %r8, oR8(%rdi)
++ movq %r9, oR9(%rdi)
++
++ movq (%rsp), %rcx
++ movq %rcx, oRIP(%rdi)
++ leaq 8(%rsp), %rcx /* Exclude the return address. */
++ movq %rcx, oRSP(%rdi)
++
++ /* We have separate floating-point register content memory on the
++ stack. We use the __fpregs_mem block in the context. Set the
++ links up correctly. */
++
++ leaq oFPREGSMEM(%rdi), %rcx
++ movq %rcx, oFPREGS(%rdi)
++ /* Save the floating-point environment. */
++ fnstenv (%rcx)
++ fldenv (%rcx)
++ stmxcsr oMXCSR(%rdi)
++
++ /* Save the current signal mask with
++ rt_sigprocmask (SIG_BLOCK, NULL, set,_NSIG/8). */
++ leaq oSIGMASK(%rdi), %rdx
++ xorl %esi,%esi
++#if SIG_BLOCK == 0
++ xorl %edi, %edi
++#else
++ movl $SIG_BLOCK, %edi
++#endif
++ movl $_NSIG8,%r10d
++ movl $__NR_rt_sigprocmask, %eax
++ syscall
++ cmpq $-4095, %rax /* Check %rax for error. */
++ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
++
++ /* All done, return 0 for success. */
++ xorl %eax, %eax
++L(pseudo_end):
++ ret
++PSEUDO_END(__getcontext)
++
++weak_alias (__getcontext, getcontext)
+diff --git a/libc/sysdeps/linux/x86_64/makecontext.c b/libc/sysdeps/linux/x86_64/makecontext.c
+new file mode 100644
+index 0000000..5473031
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/makecontext.c
+@@ -0,0 +1,121 @@
++/* Create new context.
++ Copyright (C) 2002, 2004, 2005, 2008 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++#include <stdarg.h>
++#include <stdint.h>
++#include <ucontext.h>
++
++#include "ucontext_i.h"
++
++/* This implementation can handle any ARGC value but only
++ normal integer parameters.
++ makecontext sets up a stack and the registers for the
++ user context. The stack looks like this:
++ +-----------------------+
++ | next context |
++ +-----------------------+
++ | parameter 7-n |
++ +-----------------------+
++ | trampoline address |
++ %rsp -> +-----------------------+
++
++ The registers are set up like this:
++ %rdi,%rsi,%rdx,%rcx,%r8,%r9: parameter 1 to 6
++ %rbx : address of next context
++ %rsp : stack pointer.
++*/
++
++/* XXX: This implementation currently only handles integer arguments.
++ To handle long int and pointer arguments the va_arg arguments needs
++ to be changed to long and also the stdlib/tst-setcontext.c file needs
++ to be changed to pass long arguments to makecontext. */
++
++
++void
++__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
++{
++ extern void __start_context (void);
++ greg_t *sp;
++ unsigned int idx_uc_link;
++ va_list ap;
++ int i;
++
++ /* Generate room on stack for parameter if needed and uc_link. */
++ sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp
++ + ucp->uc_stack.ss_size);
++ sp -= (argc > 6 ? argc - 6 : 0) + 1;
++ /* Align stack and make space for trampoline address. */
++ sp = (greg_t *) ((((uintptr_t) sp) & -16L) - 8);
++
++ idx_uc_link = (argc > 6 ? argc - 6 : 0) + 1;
++
++ /* Setup context ucp. */
++ /* Address to jump to. */
++ ucp->uc_mcontext.gregs[REG_RIP] = (uintptr_t) func;
++ /* Setup rbx.*/
++ ucp->uc_mcontext.gregs[REG_RBX] = (uintptr_t) &sp[idx_uc_link];
++ ucp->uc_mcontext.gregs[REG_RSP] = (uintptr_t) sp;
++
++ /* Setup stack. */
++ sp[0] = (uintptr_t) &__start_context;
++ sp[idx_uc_link] = (uintptr_t) ucp->uc_link;
++
++ va_start (ap, argc);
++ /* Handle arguments.
++
++ The standard says the parameters must all be int values. This is
++ an historic accident and would be done differently today. For
++ x86-64 all integer values are passed as 64-bit values and
++ therefore extending the API to copy 64-bit values instead of
++ 32-bit ints makes sense. It does not break existing
++ functionality and it does not violate the standard which says
++ that passing non-int values means undefined behavior. */
++ for (i = 0; i < argc; ++i)
++ switch (i)
++ {
++ case 0:
++ ucp->uc_mcontext.gregs[REG_RDI] = va_arg (ap, greg_t);
++ break;
++ case 1:
++ ucp->uc_mcontext.gregs[REG_RSI] = va_arg (ap, greg_t);
++ break;
++ case 2:
++ ucp->uc_mcontext.gregs[REG_RDX] = va_arg (ap, greg_t);
++ break;
++ case 3:
++ ucp->uc_mcontext.gregs[REG_RCX] = va_arg (ap, greg_t);
++ break;
++ case 4:
++ ucp->uc_mcontext.gregs[REG_R8] = va_arg (ap, greg_t);
++ break;
++ case 5:
++ ucp->uc_mcontext.gregs[REG_R9] = va_arg (ap, greg_t);
++ break;
++ default:
++ /* Put value on stack. */
++ sp[i - 5] = va_arg (ap, greg_t);
++ break;
++ }
++ va_end (ap);
++
++}
++
++
++weak_alias (__makecontext, makecontext)
+diff --git a/libc/sysdeps/linux/x86_64/setcontext.S b/libc/sysdeps/linux/x86_64/setcontext.S
+new file mode 100644
+index 0000000..561ab9f
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/setcontext.S
+@@ -0,0 +1,103 @@
++/* Install given context.
++ Copyright (C) 2002-2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++/* int __setcontext (const ucontext_t *ucp)
++
++ Restores the machine context in UCP and thereby resumes execution
++ in that context.
++
++ This implementation is intended to be used for *synchronous* context
++ switches only. Therefore, it does not have to restore anything
++ other than the PRESERVED state. */
++
++ENTRY(__setcontext)
++ /* Save argument since syscall will destroy it. */
++ pushq %rdi
++ cfi_adjust_cfa_offset(8)
++
++ /* Set the signal mask with
++ rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */
++ leaq oSIGMASK(%rdi), %rsi
++ xorl %edx, %edx
++ movl $SIG_SETMASK, %edi
++ movl $_NSIG8,%r10d
++ movl $__NR_rt_sigprocmask, %eax
++ syscall
++ popq %rdi /* Reload %rdi, adjust stack. */
++ cfi_adjust_cfa_offset(-8)
++ cmpq $-4095, %rax /* Check %rax for error. */
++ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
++
++ /* Restore the floating-point context. Not the registers, only the
++ rest. */
++ movq oFPREGS(%rdi), %rcx
++ fldenv (%rcx)
++ ldmxcsr oMXCSR(%rdi)
++
++
++ /* Load the new stack pointer, the preserved registers and
++ registers used for passing args. */
++ cfi_def_cfa(%rdi, 0)
++ cfi_offset(%rbx,oRBX)
++ cfi_offset(%rbp,oRBP)
++ cfi_offset(%r12,oR12)
++ cfi_offset(%r13,oR13)
++ cfi_offset(%r14,oR14)
++ cfi_offset(%r15,oR15)
++ cfi_offset(%rsp,oRSP)
++ cfi_offset(%rip,oRIP)
++
++ movq oRSP(%rdi), %rsp
++ movq oRBX(%rdi), %rbx
++ movq oRBP(%rdi), %rbp
++ movq oR12(%rdi), %r12
++ movq oR13(%rdi), %r13
++ movq oR14(%rdi), %r14
++ movq oR15(%rdi), %r15
++
++ /* The following ret should return to the address set with
++ getcontext. Therefore push the address on the stack. */
++ movq oRIP(%rdi), %rcx
++ pushq %rcx
++
++ movq oRSI(%rdi), %rsi
++ movq oRDX(%rdi), %rdx
++ movq oRCX(%rdi), %rcx
++ movq oR8(%rdi), %r8
++ movq oR9(%rdi), %r9
++
++ /* Setup finally %rdi. */
++ movq oRDI(%rdi), %rdi
++
++ /* End FDE here, we fall into another context. */
++ cfi_endproc
++ cfi_startproc
++
++ /* Clear rax to indicate success. */
++ xorl %eax, %eax
++L(pseudo_end):
++ ret
++PSEUDO_END(__setcontext)
++
++weak_alias (__setcontext, setcontext)
+diff --git a/libc/sysdeps/linux/x86_64/swapcontext.S b/libc/sysdeps/linux/x86_64/swapcontext.S
+new file mode 100644
+index 0000000..6d2ebb8
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/swapcontext.S
+@@ -0,0 +1,121 @@
++/* Save current context and install the given one.
++ Copyright (C) 2002-2012 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++ Contributed by Andreas Jaeger <aj@suse.de>, 2002.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <sysdep.h>
++
++#include "ucontext_i.h"
++
++
++/* int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp);
++
++ Saves the machine context in oucp such that when it is activated,
++ it appears as if __swapcontextt() returned again, restores the
++ machine context in ucp and thereby resumes execution in that
++ context.
++
++ This implementation is intended to be used for *synchronous* context
++ switches only. Therefore, it does not have to save anything
++ other than the PRESERVED state. */
++
++ENTRY(__swapcontext)
++ /* Save the preserved registers, the registers used for passing args,
++ and the return address. */
++ movq %rbx, oRBX(%rdi)
++ movq %rbp, oRBP(%rdi)
++ movq %r12, oR12(%rdi)
++ movq %r13, oR13(%rdi)
++ movq %r14, oR14(%rdi)
++ movq %r15, oR15(%rdi)
++
++ movq %rdi, oRDI(%rdi)
++ movq %rsi, oRSI(%rdi)
++ movq %rdx, oRDX(%rdi)
++ movq %rcx, oRCX(%rdi)
++ movq %r8, oR8(%rdi)
++ movq %r9, oR9(%rdi)
++
++ movq (%rsp), %rcx
++ movq %rcx, oRIP(%rdi)
++ leaq 8(%rsp), %rcx /* Exclude the return address. */
++ movq %rcx, oRSP(%rdi)
++
++ /* We have separate floating-point register content memory on the
++ stack. We use the __fpregs_mem block in the context. Set the
++ links up correctly. */
++ leaq oFPREGSMEM(%rdi), %rcx
++ movq %rcx, oFPREGS(%rdi)
++ /* Save the floating-point environment. */
++ fnstenv (%rcx)
++ stmxcsr oMXCSR(%rdi)
++
++
++ /* The syscall destroys some registers, save them. */
++ movq %rsi, %r12
++
++ /* Save the current signal mask and install the new one with
++ rt_sigprocmask (SIG_BLOCK, newset, oldset,_NSIG/8). */
++ leaq oSIGMASK(%rdi), %rdx
++ leaq oSIGMASK(%rsi), %rsi
++ movl $SIG_SETMASK, %edi
++ movl $_NSIG8,%r10d
++ movl $__NR_rt_sigprocmask, %eax
++ syscall
++ cmpq $-4095, %rax /* Check %rax for error. */
++ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
++
++ /* Restore destroyed registers. */
++ movq %r12, %rsi
++
++ /* Restore the floating-point context. Not the registers, only the
++ rest. */
++ movq oFPREGS(%rsi), %rcx
++ fldenv (%rcx)
++ ldmxcsr oMXCSR(%rsi)
++
++ /* Load the new stack pointer and the preserved registers. */
++ movq oRSP(%rsi), %rsp
++ movq oRBX(%rsi), %rbx
++ movq oRBP(%rsi), %rbp
++ movq oR12(%rsi), %r12
++ movq oR13(%rsi), %r13
++ movq oR14(%rsi), %r14
++ movq oR15(%rsi), %r15
++
++ /* The following ret should return to the address set with
++ getcontext. Therefore push the address on the stack. */
++ movq oRIP(%rsi), %rcx
++ pushq %rcx
++
++ /* Setup registers used for passing args. */
++ movq oRDI(%rsi), %rdi
++ movq oRDX(%rsi), %rdx
++ movq oRCX(%rsi), %rcx
++ movq oR8(%rsi), %r8
++ movq oR9(%rsi), %r9
++
++ /* Setup finally %rsi. */
++ movq oRSI(%rsi), %rsi
++
++ /* Clear rax to indicate success. */
++ xorl %eax, %eax
++L(pseudo_end):
++ ret
++PSEUDO_END(__swapcontext)
++
++weak_alias (__swapcontext, swapcontext)
+diff --git a/libc/sysdeps/linux/x86_64/ucontext_i.sym b/libc/sysdeps/linux/x86_64/ucontext_i.sym
+new file mode 100644
+index 0000000..af3e0e5
+--- /dev/null
++++ b/libc/sysdeps/linux/x86_64/ucontext_i.sym
+@@ -0,0 +1,37 @@
++#include <stddef.h>
++#include <signal.h>
++#include <sys/ucontext.h>
++
++--
++
++SIG_BLOCK
++SIG_SETMASK
++
++_NSIG8 (_NSIG / 8)
++
++#define ucontext(member) offsetof (ucontext_t, member)
++#define mcontext(member) ucontext (uc_mcontext.member)
++#define mreg(reg) mcontext (gregs[REG_##reg])
++
++oRBP mreg (RBP)
++oRSP mreg (RSP)
++oRBX mreg (RBX)
++oR8 mreg (R8)
++oR9 mreg (R9)
++oR10 mreg (R10)
++oR11 mreg (R11)
++oR12 mreg (R12)
++oR13 mreg (R13)
++oR14 mreg (R14)
++oR15 mreg (R15)
++oRDI mreg (RDI)
++oRSI mreg (RSI)
++oRDX mreg (RDX)
++oRAX mreg (RAX)
++oRCX mreg (RCX)
++oRIP mreg (RIP)
++oEFL mreg (EFL)
++oFPREGS mcontext (fpregs)
++oSIGMASK ucontext (uc_sigmask)
++oFPREGSMEM ucontext (__fpregs_mem)
++oMXCSR ucontext (__fpregs_mem.mxcsr)
+diff --git a/libpthread/nptl/sysdeps/Makefile.commonarch b/libpthread/nptl/sysdeps/Makefile.commonarch
+index 0c19216..8f5d61d 100644
+--- a/libpthread/nptl/sysdeps/Makefile.commonarch
++++ b/libpthread/nptl/sysdeps/Makefile.commonarch
+@@ -47,9 +47,8 @@ $(libpthread_arch_OUT)/gen_tcb-offsets.c: $(libpthread_arch_DIR)/tcb-offsets.sym
+ $(libpthread_arch_OUT)/gen_tcb-offsets.s: $(libpthread_arch_OUT)/gen_tcb-offsets.c | headers
+ $(compile.c)
+ libpthread-generated-y += $(libpthread_arch_OUT)/gen_tcb-offsets.s
+-PTHREAD_TCB_OFFSET_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
+ $(libpthread_arch_OUT)/tcb-offsets.h: $(libpthread_arch_OUT)/gen_tcb-offsets.s
+- $(do_sed) $(PTHREAD_TCB_OFFSET_MANGLE) $< > $@
++ $(do_sed) $(PTHREAD_GENERATE_MANGLE) $< > $@
+ @if test ! -s $@ ; then rm -f $@ ; false ; fi
+
+ pregen-headers-$(UCLIBC_HAS_THREADS_NATIVE) += $(libpthread_arch_OUT)/tcb-offsets.h
+diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
+index 477fb1a..3372214 100644
+--- a/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
++++ b/libpthread/nptl/sysdeps/unix/sysv/linux/Makefile.commonarch
+@@ -177,8 +177,6 @@ CFLAGS-gen_pthread-pi-defines.c = -S
+ CFLAGS-gen_structsem.c = -S
+ CFLAGS-gen_unwindbuf.c = -S
+
+-PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"
+-
+ PTHREAD_LINUX_SYM := $(notdir $(wildcard $(libpthread_linux_DIR)/*.sym))
+ PTHREAD_LINUX_SYM_C := $(addprefix $(libpthread_linux_OUT)/gen_,$(PTHREAD_LINUX_SYM:.sym=.c))
+ PTHREAD_LINUX_SYM_S := $(PTHREAD_LINUX_SYM_C:.c=.s)
+--
+1.8.4
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-13 15:50:48 +0000