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authorZhangjin Wu <falcon@tinylab.org>2023-07-15 21:28:55 +0300
committerWilly Tarreau <w@1wt.eu>2023-08-23 05:40:22 +0300
commit431b806b9bc33cf505204f4047182524120aaf7a (patch)
treeac8242dbffd17d907f12e4f5bea7c09add625b8c /tools/include
parent539287d75178fd77c195520477dcd35a4d28a737 (diff)
downloadlinux-431b806b9bc33cf505204f4047182524120aaf7a.tar.xz
tools/nolibc: mips: shrink _start with _start_c
move most of the _start operations to _start_c(), include the stackprotector initialization. Also clean up the instructions in delayed slots. Signed-off-by: Zhangjin Wu <falcon@tinylab.org> Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'tools/include')
-rw-r--r--tools/include/nolibc/arch-mips.h46
1 files changed, 8 insertions, 38 deletions
diff --git a/tools/include/nolibc/arch-mips.h b/tools/include/nolibc/arch-mips.h
index 7242fc9de04f..4ab6fa54beee 100644
--- a/tools/include/nolibc/arch-mips.h
+++ b/tools/include/nolibc/arch-mips.h
@@ -8,6 +8,7 @@
#define _NOLIBC_ARCH_MIPS_H
#include "compiler.h"
+#include "crt.h"
/* Syscalls for MIPS ABI O32 :
* - WARNING! there's always a delayed slot!
@@ -173,50 +174,19 @@
_arg4 ? -_num : _num; \
})
-char **environ __attribute__((weak));
-const unsigned long *_auxv __attribute__((weak));
-
/* startup code, note that it's called __start on MIPS */
void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector __start(void)
{
__asm__ volatile (
- /*".set nomips16\n"*/
".set push\n"
- ".set noreorder\n"
+ ".set noreorder\n"
".option pic0\n"
-#ifdef _NOLIBC_STACKPROTECTOR
- "jal __stack_chk_init\n" /* initialize stack protector */
- "nop\n" /* delayed slot */
-#endif
- /*".ent __start\n"*/
- /*"__start:\n"*/
- "lw $a0,($sp)\n" /* argc was in the stack */
- "addiu $a1, $sp, 4\n" /* argv = sp + 4 */
- "sll $a2, $a0, 2\n" /* a2 = argc * 4 */
- "add $a2, $a2, $a1\n" /* envp = argv + 4*argc ... */
- "addiu $a2, $a2, 4\n" /* ... + 4 */
- "lui $a3, %hi(environ)\n" /* load environ into a3 (hi) */
- "addiu $a3, %lo(environ)\n" /* load environ into a3 (lo) */
- "sw $a2,($a3)\n" /* store envp(a2) into environ */
-
- "move $t0, $a2\n" /* iterate t0 over envp, look for NULL */
- "0:" /* do { */
- "lw $a3, ($t0)\n" /* a3=*(t0); */
- "bne $a3, $0, 0b\n" /* } while (a3); */
- "addiu $t0, $t0, 4\n" /* delayed slot: t0+=4; */
- "lui $a3, %hi(_auxv)\n" /* load _auxv into a3 (hi) */
- "addiu $a3, %lo(_auxv)\n" /* load _auxv into a3 (lo) */
- "sw $t0, ($a3)\n" /* store t0 into _auxv */
-
- "li $t0, -8\n"
- "and $sp, $sp, $t0\n" /* sp must be 8-byte aligned */
- "addiu $sp,$sp,-16\n" /* the callee expects to save a0..a3 there! */
- "jal main\n" /* main() returns the status code, we'll exit with it. */
- "nop\n" /* delayed slot */
- "move $a0, $v0\n" /* retrieve 32-bit exit code from v0 */
- "li $v0, 4001\n" /* NR_exit == 4001 */
- "syscall\n"
- /*".end __start\n"*/
+ "move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */
+ "li $t0, -8\n"
+ "and $sp, $sp, $t0\n" /* $sp must be 8-byte aligned */
+ "addiu $sp, $sp, -16\n" /* the callee expects to save a0..a3 there */
+ "jal _start_c\n" /* transfer to c runtime */
+ " nop\n" /* delayed slot */
".set pop\n"
);
__builtin_unreachable();