diff options
Diffstat (limited to 'libc/sysdeps/linux/arm')
| -rw-r--r-- | libc/sysdeps/linux/arm/__syscall_error.c | 29 | ||||
| -rw-r--r-- | libc/sysdeps/linux/arm/crt1.S | 143 |
2 files changed, 172 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arm/__syscall_error.c b/libc/sysdeps/linux/arm/__syscall_error.c new file mode 100644 index 000000000..de65a1f39 --- /dev/null +++ b/libc/sysdeps/linux/arm/__syscall_error.c @@ -0,0 +1,29 @@ +/* Wrapper for setting errno. + Copyright (C) 1997, 1998, 1999, 2000 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <features.h> + +/* This routine is jumped to by all the syscall handlers, to stash + * an error number into errno. */ +int attribute_hidden __syscall_error(int err_no) +{ + __set_errno(err_no); + return -1; +} diff --git a/libc/sysdeps/linux/arm/crt1.S b/libc/sysdeps/linux/arm/crt1.S new file mode 100644 index 000000000..01e1f61d3 --- /dev/null +++ b/libc/sysdeps/linux/arm/crt1.S @@ -0,0 +1,143 @@ +/* Startup code for ARM & ELF + Copyright (C) 1995, 1996, 1997, 1998, 2001, 2002 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* This is the canonical entry point, usually the first thing in the text + segment. + + Note that the code in the .init section has already been run. + This includes _init and _libc_init + + + At this entry point, most registers' values are unspecified, except: + + a1 Contains a function pointer to be registered with `atexit'. + This is how the dynamic linker arranges to have DT_FINI + functions called for shared libraries that have been loaded + before this code runs. + + sp The stack contains the arguments and environment: + 0(sp) argc + 4(sp) argv[0] + ... + (4*argc)(sp) NULL + (4*(argc+1))(sp) envp[0] + ... + NULL +*/ +/* + For uClinux it looks like this: + + argc argument counter (integer) + argv char *argv[] + envp char *envp[] + argv[0] program name (pointer) + argv[1...N] program args (pointers) + argv[argc-1] end of args (integer) + NULL + env[0...N] environment variables (pointers) + NULL + +ARM register quick reference: + + Name Number ARM Procedure Calling Standard Role + + a1 r0 argument 1 / integer result / scratch register / argc + a2 r1 argument 2 / scratch register / argv + a3 r2 argument 3 / scratch register / envp + a4 r3 argument 4 / scratch register + v1 r4 register variable + v2 r5 register variable + v3 r6 register variable + v4 r7 register variable + v5 r8 register variable + sb/v6 r9 static base / register variable + sl/v7 r10 stack limit / stack chunk handle / reg. variable + fp r11 frame pointer + ip r12 scratch register / new-sb in inter-link-unit calls + sp r13 lower end of current stack frame + lr r14 link address / scratch register + pc r15 program counter +*/ + + .text + .globl _start + .type _start,#function +_start: + /* Clear the frame pointer and link register since this is the outermost frame. */ + mov fp, #0 + mov lr, #0 + + /* Pop argc off the stack and save a pointer to argv */ + ldr a2, [sp], #4 + mov a3, sp + + /* Push stack limit */ + str a3, [sp, #-4]! + + /* Push rtld_fini */ + str a1, [sp, #-4]! + +#ifdef __PIC__ + ldr sl, .L_GOT +.L_GOT_OFF: + add sl, pc, sl + + ldr ip, .L_GOT+4 /* _fini */ + ldr a1, [sl, ip] + str a1, [sp, #-4]! /* Push _fini */ + + ldr ip, .L_GOT+8 /* _init */ + ldr a4, [sl, ip] + + ldr ip, .L_GOT+12 /* main */ + ldr a1, [sl, ip] + + /* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */ + /* Let the libc call main and exit with its return code. */ + b __uClibc_main(PLT) +#else + /* Fetch address of fini */ + ldr ip, =_fini + /* Push fini */ + str ip, [sp, #-4]! + + /* Set up the other arguments in registers */ + ldr a1, =main + ldr a4, =_init + + /* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */ + /* Let the libc call main and exit with its return code. */ + b __uClibc_main +#endif + +#ifdef __PIC__ +.L_GOT: + .word _GLOBAL_OFFSET_TABLE_-(.L_GOT_OFF+8) + .word _fini(GOT) + .word _init(GOT) + .word main(GOT) +#endif + +/* Define a symbol for the first piece of initialized data. */ + .data + .globl __data_start +__data_start: + .long 0 + .weak data_start + data_start = __data_start |