system/glibc
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2004-04-29 Philip Blundell <pb@nexus.co.uk>

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* sysdeps/arm/dl-machine.h (RTLD_START): Avoid unnecessary GOT
	entries.
This commit is contained in:
Roland McGrath 2004-04-29 20:06:49 +00:00
parent e52ded1809
commit 08b55be5f9
1 changed files with 13 additions and 20 deletions
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33
sysdeps/arm/dl-machine.h
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@ -255,26 +255,27 @@ _dl_runtime_profile:\n\
.globl _start\n\
.globl _dl_start_user\n\
_start:\n\
@ we are PIC code, so get global offset table\n\
ldr sl, .L_GET_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\
@ 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\
_dl_start_user:\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\
@ save the entry point in another register\n\
mov r6, r0\n\
@ adjust the stack pointer to skip the extra args\n\
add sp, sp, r4, lsl #2\n\
@ subtract _dl_skip_args from original arg count\n\
sub r1, r1, r4\n\
@ get the argv address\n\
add r2, sp, #4\n\
@ store the new argc in the new stack location\n\
@ -286,29 +287,21 @@ _dl_start_user:\n\
@ now we call _dl_init\n\
ldr r0, .L_LOADED\n\
ldr r0, [sl, r0]\n\
ldr r0, [r0]\n\
@ call _dl_init\n\
bl _dl_init_internal(PLT)\n\
@ clear the startup flag\n\
ldr r2, .L_STARTUP_FLAG\n\
ldr r1, [sl, r2]\n\
mov r0, #0\n\
str r0, [r1]\n\
@ load the finalizer function\n\
ldr r0, .L_FINI_PROC\n\
ldr r0, [sl, r0]\n\
add 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_STARTUP_FLAG:\n\
.word _dl_starting_up(GOT)\n\
.L_FINI_PROC:\n\
.word _dl_fini(GOT)\n\
.word _dl_fini(GOTOFF)\n\
.L_LOADED:\n\
.word _rtld_local(GOT)\n\
.word _rtld_local(GOTOFF)\n\
.previous\n\
");