diff options
Diffstat (limited to 'libc/sysdeps/linux/mips/clone.S')
| -rw-r--r-- | libc/sysdeps/linux/mips/clone.S | 161 |
1 files changed, 61 insertions, 100 deletions
diff --git a/libc/sysdeps/linux/mips/clone.S b/libc/sysdeps/linux/mips/clone.S index 82f04adfa..716cd993f 100644 --- a/libc/sysdeps/linux/mips/clone.S +++ b/libc/sysdeps/linux/mips/clone.S @@ -1,6 +1,6 @@ -/* Copyright (C) 1996, 1997, 2000, 2003, 2005 Free Software Foundation, Inc. +/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. - Contributed by Ralf Baechle <ralf@linux-mips.org>, 1996. + Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>, 1996. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -20,117 +20,100 @@ /* clone() is even more special than fork() as it mucks with stacks and invokes a function in the right context after its all over. */ +#include <features.h> +#include <asm/unistd.h> +#include <sys/regdef.h> +#define _ERRNO_H 1 +#include <bits/errno.h> #include <sys/asm.h> -#include <sysdep.h> -#include <bits/errno_values.h> -#ifdef RESET_PID -#include <tls.h> -#endif - -#define CLONE_VM 0x00000100 -#define CLONE_THREAD 0x00010000 -/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, - void *parent_tidptr, void *tls, void *child_tidptr) */ +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */ .text -#if _MIPS_SIM == _ABIO32 -# define EXTRA_LOCALS 1 -#else -# define EXTRA_LOCALS 0 -#endif -LOCALSZ= 4 -FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK -GPOFF= FRAMESZ-(1*SZREG) -NESTED(__clone,4*SZREG,sp) +.globl clone ; + .align 2; + .type clone,@function; + .ent clone, 0; + +clone: + .frame sp, 4*SZREG, sp #ifdef __PIC__ - SETUP_GP -#endif - PTR_SUBU sp, FRAMESZ - SETUP_GP64 (GPOFF, __clone) -#ifdef __PIC__ - SAVE_GP (GPOFF) -#endif -#ifdef PROF - .set noat - move $1,ra - jal _mcount - .set at +#if _MIPS_SIM == _MIPS_SIM_ABI32 + .set noreorder + .cpload $25 + .set reorder + subu sp,32 + .cprestore 16 +#else /* N32 */ + PTR_SUBU sp,32 /* fn, arg, gp, pad */ + .cpsetup $25, 16, clone +#endif /* N32 */ +#else + subu sp,32 #endif /* Sanity check arguments. */ li v0,EINVAL - beqz a0,L(error) /* No NULL function pointers. */ - beqz a1,L(error) /* No NULL stack pointers. */ + beqz a0,error /* No NULL function pointers. */ + beqz a1,error /* No NULL stack pointers. */ +#if _MIPS_SIM != _MIPS_SIM_ABI32 + and a1,~(16-1) /* force alignment */ +#endif PTR_SUBU a1,32 /* Reserve argument save space. */ PTR_S a0,0(a1) /* Save function pointer. */ PTR_S a3,PTRSIZE(a1) /* Save argument pointer. */ -#ifdef RESET_PID - LONG_S a2,(PTRSIZE*2)(a1) /* Save clone flags. */ -#endif - - move a0,a2 - /* Shuffle in the last three arguments - arguments 5, 6, and 7 to - this function, but arguments 3, 4, and 5 to the syscall. */ -#if _MIPS_SIM == _ABIO32 - PTR_L a2,(FRAMESZ+PTRSIZE+PTRSIZE+16)(sp) - PTR_S a2,16(sp) - PTR_L a2,(FRAMESZ+16)(sp) - PTR_L a3,(FRAMESZ+PTRSIZE+16)(sp) -#else - move a2,a4 - move a3,a5 - move a4,a6 -#endif /* Do the system call */ + move a0,a2 li v0,__NR_clone syscall - bnez a3,L(error) - beqz v0,L(thread_start) + bnez a3,error + beqz v0,__thread_start /* Successful return from the parent */ - RESTORE_GP64 - PTR_ADDU sp, FRAMESZ - ret +#if _MIPS_SIM != _MIPS_SIM_ABI32 + .cpreturn +#endif + PTR_ADDU sp,32 + j $31 ; nop /* Something bad happened -- no child created */ -L(error): - move a0,v0 +error: +#if _MIPS_SIM != _MIPS_SIM_ABI32 + .cpreturn +#endif + PTR_ADDU sp,32 + + /* uClibc change -- start */ + move a0,v0 /* Pass return val to C function. */ + /* uClibc change -- stop */ + #ifdef __PIC__ PTR_LA t9,__syscall_error - RESTORE_GP64 - PTR_ADDU sp, FRAMESZ jr t9 #else - RESTORE_GP64 - PTR_ADDU sp, FRAMESZ j __syscall_error #endif - END(__clone) + .end clone /* Load up the arguments to the function. Put this block of code in its own function so that we can terminate the stack trace with our debug info. */ -ENTRY(__thread_start) -L(thread_start): - /* cp is already loaded. */ - SAVE_GP (GPOFF) - /* The stackframe has been created on entry of clone(). */ +.globl __thread_start; + .align 2; + .ent __thread_start, 0; -#ifdef RESET_PID - /* Check and see if we need to reset the PID. */ - LONG_L a0,(PTRSIZE*2)(sp) - and a1,a0,CLONE_THREAD - beqz a1,L(restore_pid) -L(donepid): +__thread_start: +#if _MIPS_SIM == _MIPS_SIM_ABI32 + /* cp is already loaded. */ + .cprestore 16 #endif - + /* The stackframe has been created on entry of clone(). */ /* Restore the arg for user's function. */ PTR_L t9,0(sp) /* Function pointer. */ PTR_L a0,PTRSIZE(sp) /* Argument pointer. */ @@ -140,27 +123,5 @@ L(donepid): /* Call _exit rather than doing it inline for breakpoint purposes. */ move a0,v0 -#ifdef __PIC__ - PTR_LA t9,_exit - jalr t9 -#else - jal _exit -#endif - -#ifdef RESET_PID -L(restore_pid): - and a1,a0,CLONE_VM - li v0,-1 - bnez a1,L(gotpid) - li v0,__NR_getpid - syscall -L(gotpid): - READ_THREAD_POINTER(v1) - INT_S v0,PID_OFFSET(v1) - INT_S v0,TID_OFFSET(v1) - b L(donepid) -#endif - - END(__thread_start) - -weak_alias (__clone, clone) + jal HIDDEN_JUMPTARGET(_exit) + .end __thread_start |