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Message-Id: <47893d501e6d4ededa233e2596ac32f219480270.1688828139.git.falcon@tinylab.org>
Date: Sat, 8 Jul 2023 23:36:33 +0800
From: Zhangjin Wu <falcon@...ylab.org>
To: w@....eu
Cc: falcon@...ylab.org, arnd@...db.de, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org, thomas@...ch.de
Subject: [PATCH v2 10/12] tools/nolibc: loongarch/crt.h: shrink _start with _start_c
move most of the _start operations to _start_c().
Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
tools/include/nolibc/loongarch/crt.h | 39 +++-------------------------
1 file changed, 4 insertions(+), 35 deletions(-)
diff --git a/tools/include/nolibc/loongarch/crt.h b/tools/include/nolibc/loongarch/crt.h
index 253d2fccea1e..00bfc36b0747 100644
--- a/tools/include/nolibc/loongarch/crt.h
+++ b/tools/include/nolibc/loongarch/crt.h
@@ -8,22 +8,8 @@
#define _NOLIBC_LOONGARCH_CRT_H
#if __loongarch_grlen == 32
-#define LONGLOG "2"
-#define SZREG "4"
-#define REG_L "ld.w"
-#define LONG_S "st.w"
-#define LONG_ADD "add.w"
-#define LONG_ADDI "addi.w"
-#define LONG_SLL "slli.w"
#define LONG_BSTRINS "bstrins.w"
#else /* __loongarch_grlen == 64 */
-#define LONGLOG "3"
-#define SZREG "8"
-#define REG_L "ld.d"
-#define LONG_S "st.d"
-#define LONG_ADD "add.d"
-#define LONG_ADDI "addi.d"
-#define LONG_SLL "slli.d"
#define LONG_BSTRINS "bstrins.d"
#endif
@@ -32,28 +18,11 @@ void __attribute__((weak, noreturn, optimize("omit-frame-pointer"))) __no_stack_
{
__asm__ volatile (
#ifdef _NOLIBC_STACKPROTECTOR
- "bl __stack_chk_init\n" /* initialize stack protector */
+ "bl __stack_chk_init\n" /* initialize stack protector */
#endif
- REG_L " $a0, $sp, 0\n" /* argc (a0) was in the stack */
- LONG_ADDI " $a1, $sp, "SZREG"\n" /* argv (a1) = sp + SZREG */
- LONG_SLL " $a2, $a0, "LONGLOG"\n" /* envp (a2) = SZREG*argc ... */
- LONG_ADDI " $a2, $a2, "SZREG"\n" /* + SZREG (skip null) */
- LONG_ADD " $a2, $a2, $a1\n" /* + argv */
-
- "move $a3, $a2\n" /* iterate a3 over envp to find auxv (after NULL) */
- "0:\n" /* do { */
- REG_L " $a4, $a3, 0\n" /* a4 = *a3; */
- LONG_ADDI " $a3, $a3, "SZREG"\n" /* a3 += sizeof(void*); */
- "bne $a4, $zero, 0b\n" /* } while (a4); */
- "la.pcrel $a4, _auxv\n" /* a4 = &_auxv */
- LONG_S " $a3, $a4, 0\n" /* store a3 into _auxv */
-
- "la.pcrel $a3, environ\n" /* a3 = &environ */
- LONG_S " $a2, $a3, 0\n" /* store envp(a2) into environ */
- LONG_BSTRINS " $sp, $zero, 3, 0\n" /* sp must be 16-byte aligned */
- "bl main\n" /* main() returns the status code, we'll exit with it. */
- "li.w $a7, 93\n" /* NR_exit == 93 */
- "syscall 0\n"
+ "move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */
+ LONG_BSTRINS " $sp, $zero, 3, 0\n" /* $sp must be 16-byte aligned */
+ "bl _start_c\n" /* transfer to c runtime */
);
__builtin_unreachable();
}
--
2.25.1
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