tools/nolibc: loongarch: shrink _start with _start_c
move most of the _start operations to _start_c(), include the stackprotector initialization. Signed-off-by: Zhangjin Wu <falcon@tinylab.org> Signed-off-by: Willy Tarreau <w@1wt.eu>
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@ -8,6 +8,7 @@
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#define _NOLIBC_ARCH_LOONGARCH_H
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#include "compiler.h"
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#include "crt.h"
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/* Syscalls for LoongArch :
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* - stack is 16-byte aligned
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@ -143,26 +144,9 @@
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_arg1; \
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})
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char **environ __attribute__((weak));
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const unsigned long *_auxv __attribute__((weak));
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#if __loongarch_grlen == 32
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#define LONGLOG "2"
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#define SZREG "4"
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#define REG_L "ld.w"
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#define LONG_S "st.w"
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#define LONG_ADD "add.w"
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#define LONG_ADDI "addi.w"
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#define LONG_SLL "slli.w"
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#define LONG_BSTRINS "bstrins.w"
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#else /* __loongarch_grlen == 64 */
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#define LONGLOG "3"
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#define SZREG "8"
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#define REG_L "ld.d"
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#define LONG_S "st.d"
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#define LONG_ADD "add.d"
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#define LONG_ADDI "addi.d"
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#define LONG_SLL "slli.d"
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#define LONG_BSTRINS "bstrins.d"
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#endif
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@ -170,29 +154,9 @@ const unsigned long *_auxv __attribute__((weak));
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void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void)
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{
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__asm__ volatile (
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#ifdef _NOLIBC_STACKPROTECTOR
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"bl __stack_chk_init\n" /* initialize stack protector */
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#endif
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REG_L " $a0, $sp, 0\n" /* argc (a0) was in the stack */
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LONG_ADDI " $a1, $sp, "SZREG"\n" /* argv (a1) = sp + SZREG */
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LONG_SLL " $a2, $a0, "LONGLOG"\n" /* envp (a2) = SZREG*argc ... */
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LONG_ADDI " $a2, $a2, "SZREG"\n" /* + SZREG (skip null) */
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LONG_ADD " $a2, $a2, $a1\n" /* + argv */
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"move $a3, $a2\n" /* iterate a3 over envp to find auxv (after NULL) */
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"0:\n" /* do { */
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REG_L " $a4, $a3, 0\n" /* a4 = *a3; */
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LONG_ADDI " $a3, $a3, "SZREG"\n" /* a3 += sizeof(void*); */
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"bne $a4, $zero, 0b\n" /* } while (a4); */
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"la.pcrel $a4, _auxv\n" /* a4 = &_auxv */
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LONG_S " $a3, $a4, 0\n" /* store a3 into _auxv */
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"la.pcrel $a3, environ\n" /* a3 = &environ */
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LONG_S " $a2, $a3, 0\n" /* store envp(a2) into environ */
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LONG_BSTRINS " $sp, $zero, 3, 0\n" /* sp must be 16-byte aligned */
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"bl main\n" /* main() returns the status code, we'll exit with it. */
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"li.w $a7, 93\n" /* NR_exit == 93 */
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"syscall 0\n"
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"move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */
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LONG_BSTRINS " $sp, $zero, 3, 0\n" /* $sp must be 16-byte aligned */
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"bl _start_c\n" /* transfer to c runtime */
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);
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__builtin_unreachable();
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}
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