diff options
| -rw-r--r-- | ldso/ldso/arm/dl-startup.h | 51 |
1 files changed, 42 insertions, 9 deletions
diff --git a/ldso/ldso/arm/dl-startup.h b/ldso/ldso/arm/dl-startup.h index cd4a1047b..b7ab57b0c 100644 --- a/ldso/ldso/arm/dl-startup.h +++ b/ldso/ldso/arm/dl-startup.h @@ -8,18 +8,51 @@ asm( " .text\n" " .globl _start\n" " .type _start,%function\n" - "_start:\n" - " mov r7, sp\n" - " @ldr r0, [sp], #4\n" - " mov r0, sp\n" - " bl _dl_start\n" - " mov r6, r0\n" - " mov r0, r7\n" - " mov pc, r6\n" + "_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 sl, .L_GET_GOT\n" + " add sl, pc, sl\n" + ".L_GOT_GOT:\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, [sl, 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" + " add sp, sp, r4, lsl #2\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" + " add r3, r2, r1, lsl #2\n" + " add r3, r3, #4\n" + "\n\n" + " @ load the finalizer function\n" + " ldr r0, .L_FINI_PROC\n" + " ldr r0, [sl, r0]\n" + " @ jump to the user_s entry point\n" + " mov pc, r6\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" + ".previous\n" ); + /* Get a pointer to the argv array. On many platforms this can be just * the address if the first argument, on other platforms we need to * do something a little more subtle here. */ |