diff options
Diffstat (limited to 'ldso/ldso/arm/dl-startup.h')
| -rw-r--r-- | ldso/ldso/arm/dl-startup.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/ldso/ldso/arm/dl-startup.h b/ldso/ldso/arm/dl-startup.h index 8ebc0b288..fa7c9651e 100644 --- a/ldso/ldso/arm/dl-startup.h +++ b/ldso/ldso/arm/dl-startup.h @@ -4,6 +4,7 @@ * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org> */ +#if defined(__arm__) asm( " .text\n" " .globl _start\n" @@ -40,7 +41,11 @@ asm( " ldr r0, .L_FINI_PROC\n" " ldr r0, [sl, r0]\n" " @ jump to the user_s entry point\n" +#if defined(__THUMB_INTERWORK__) + " bx r6\n" +#else " mov pc, r6\n" +#endif ".L_GET_GOT:\n" " .word _GLOBAL_OFFSET_TABLE_ - .L_GOT_GOT - 4\n" ".L_SKIP_ARGS:\n" @@ -51,6 +56,70 @@ asm( " .size _start,.-_start\n" ".previous\n" ); +#else +asm( + " .text\n" + " .arm\n" + " .globl _start\n" + " .type _start,%function\n" + "_start:\n" + " @ dumb: can't persuade the linker to make the start address\n" + " @ odd, so use an arm function and change to thumb (_dl_start\n" + " @ is thumb)\n" + " adr r0, __dl_thumb_start+1\n" + " bx r0\n" + "\n\n" + " .thumb\n" + " .globl __dl_thumb_start\n" + " .thumb_func\n" + " .type __dl_thumb_start,%function\n" + "__dl_thumb_start:\n" + " @ at start time, all the args are on the stack\n" + " mov r0, sp\n" + " bl _dl_start\n" + " @ returns user entry point in r0\n" + " mov r6, r0\n" + " @ we are PIC code, so get global offset table\n" + " ldr r7, .L_GET_GOT\n" + ".L_GOT_GOT:\n" + " add r7, pc\n" + " @ See if we were run as a command with the executable file\n" + " @ name as an extra leading argument.\n" + " ldr r4, .L_SKIP_ARGS\n" + " ldr r4, [r7, r4]\n" + " @ get the original arg count\n" + " ldr r1, [sp]\n" + " @ subtract _dl_skip_args from it\n" + " sub r1, r1, r4\n" + " @ adjust the stack pointer to skip them\n" + " lsl r4, r4, #2\n" + " add sp, r4\n" + " @ get the argv address\n" + " add r2, sp, #4\n" + " @ store the new argc in the new stack location\n" + " str r1, [sp]\n" + " @ compute envp\n" + " lsl r3, r1, #2\n" + " add r3, r3, r2\n" + " add r3, #4\n" + "\n\n" + " @ load the finalizer function\n" + " ldr r0, .L_FINI_PROC\n" + " ldr r0, [r7, r0]\n" + " @ jump to the user_s entry point\n" + " bx r6\n" + "\n\n" + ".L_GET_GOT:\n" + " .word _GLOBAL_OFFSET_TABLE_ - .L_GOT_GOT - 4\n" + ".L_SKIP_ARGS:\n" + " .word _dl_skip_args(GOTOFF)\n" + ".L_FINI_PROC:\n" + " .word _dl_fini(GOT)\n" + "\n\n" + " .size _start,.-_start\n" + ".previous\n" +); +#endif /* Get a pointer to the argv array. On many platforms this can be just |