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Message-Id: <3304844b9d5c02416d08aaffd2f009941b38163c.1687976753.git.falcon@tinylab.org>
Date: Thu, 29 Jun 2023 03:02:29 +0800
From: Zhangjin Wu <falcon@...ylab.org>
To: thomas@...ch.de, w@....eu
Cc: falcon@...ylab.org, arnd@...db.de, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: [PATCH v1 09/11] tools/nolibc: loongarch: shrink _start with _start_c
Let's move most of the _start operations to _start_c().
Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
tools/include/nolibc/arch-loongarch.h | 42 +++------------------------
1 file changed, 4 insertions(+), 38 deletions(-)
diff --git a/tools/include/nolibc/arch-loongarch.h b/tools/include/nolibc/arch-loongarch.h
index fbb4844f7993..f5cac2e81a13 100644
--- a/tools/include/nolibc/arch-loongarch.h
+++ b/tools/include/nolibc/arch-loongarch.h
@@ -145,26 +145,9 @@
_arg1; \
})
-char **environ __attribute__((weak));
-const unsigned long *_auxv __attribute__((weak));
-
#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
@@ -173,28 +156,11 @@ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_stack_pr
{
__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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