diff options
author | Eric Andersen <andersen@codepoet.org> | 2005-06-10 09:18:20 +0000 |
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committer | Eric Andersen <andersen@codepoet.org> | 2005-06-10 09:18:20 +0000 |
commit | 4e7b770ecb522ef26f9ff91ebb8dae67f20fda0f (patch) | |
tree | bd9ac3f6480934cc90e736c25ec065ae501692cf /libc/sysdeps/linux/arm/crt0.S | |
parent | 39624db737b70fa6a4f374262d014aa4b73e7456 (diff) |
Dunno yet if I got this right or not, but it now at least
has a chance of perhaps working...
Diffstat (limited to 'libc/sysdeps/linux/arm/crt0.S')
-rw-r--r-- | libc/sysdeps/linux/arm/crt0.S | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/libc/sysdeps/linux/arm/crt0.S b/libc/sysdeps/linux/arm/crt0.S deleted file mode 100644 index 4f4a8cefd..000000000 --- a/libc/sysdeps/linux/arm/crt0.S +++ /dev/null @@ -1,142 +0,0 @@ -/* When we enter this piece of code, the program stack looks like this: - argc argument counter (integer) - 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 - - 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 - - When we are done here, we want - a1=argc - a2=argv[0] - a3=argv[argc+1] - -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 -*/ - -#include <features.h> - -.text - .global _start - .type _start,%function - .weak _init - .weak _fini - .type __uClibc_start_main,%function -/* Stick in a dummy reference to main(), so that if an application - * is linking when the main() function is in a static library (.a) - * we can be sure that main() actually gets linked in */ - .type main,%function - - -.text -_start: - /* clear the frame pointer */ - mov fp, #0 - -#ifdef __ARCH_HAS_MMU__ - /* Load register r0 (argc) from the stack to its final resting place */ - ldr r0, [sp], #4 - - /* Copy argv pointer into r1 -- which its final resting place */ - mov r1, sp - - /* Skip to the end of argv and put a pointer to whatever - we find there (hopefully the environment) in r2 */ - add r2, r1, r0, lsl #2 - add r2, r2, #4 - -#else - /* - * uClinux stacks look a little different from normal - * MMU-full Linux stacks (for no good reason) - */ - /* pull argc, argv and envp off the stack */ - ldr r0,[sp, #0] - ldr r1,[sp, #4] - ldr r2,[sp, #8] -#endif - -#ifdef __PIC__ - /* Store the address of _init in r3 as an argument to main() */ - adr r5, .L_init - ldr r3, .L_init - add r3, r3, r5 - - /* Push _fini onto the stack as the final argument to main() */ - ldr r4, .L_init + 4 - add r4, r4, r5 -#else - /* Store the address of _init in r3 as an argument to main() */ - ldr r3, =_init - - /* Push _fini onto the stack as the final argument to main() */ - ldr r4, =_fini -#endif - stmfd sp!, {r4} - - /* Ok, now run uClibc's main() -- shouldn't return */ - bl __uClibc_start_main - - /* Crash if somehow `exit' returns anyways. */ - bl abort - -#ifdef __PIC__ -.L_init: - .word _init - .L_init - .word _fini - .L_init -#endif - -/* We need this stuff to make gdb behave itself, otherwise - gdb will chokes with SIGILL when trying to debug apps. -*/ - .section ".note.ABI-tag", "a" - .align 4 - .long 1f - 0f - .long 3f - 2f - .long 1 -0: .asciz "GNU" -1: .align 4 -2: .long 0 - .long 2,0,0 -3: .align 4 - -/* 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 - |