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>

diff --git a/tools/include/nolibc/arch-loongarch.h b/tools/include/nolibc/arch-loongarch.h
index 590155a..bf98f62 100644 (file)
--- a/tools/include/nolibc/arch-loongarch.h
+++ b/tools/include/nolibc/arch-loongarch.h
@@ -8,6 +8,7 @@
 #define _NOLIBC_ARCH_LOONGARCH_H
 
 #include "compiler.h"
+#include "crt.h"
 
 /* Syscalls for LoongArch :
  *   - stack is 16-byte aligned
@@ -143,26 +144,9 @@
        _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
 
@@ -170,29 +154,9 @@ const unsigned long *_auxv __attribute__((weak));
 void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void)
 {
        __asm__ volatile (
-#ifdef _NOLIBC_STACKPROTECTOR
-               "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();
 }