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Diffstat (limited to 'tools/include/nolibc/arch-loongarch.h')
-rw-r--r--tools/include/nolibc/arch-loongarch.h83
1 files changed, 21 insertions, 62 deletions
diff --git a/tools/include/nolibc/arch-loongarch.h b/tools/include/nolibc/arch-loongarch.h
index ad3f266e7093..bf98f6220195 100644
--- 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
@@ -22,18 +23,19 @@
* On LoongArch, select() is not implemented so we have to use pselect6().
*/
#define __ARCH_WANT_SYS_PSELECT6
+#define _NOLIBC_SYSCALL_CLOBBERLIST \
+ "memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8"
#define my_syscall0(num) \
({ \
register long _num __asm__ ("a7") = (num); \
register long _arg1 __asm__ ("a0"); \
\
- __asm__ volatile ( \
+ __asm__ volatile ( \
"syscall 0\n" \
: "=r"(_arg1) \
: "r"(_num) \
- : "memory", "$t0", "$t1", "$t2", "$t3", \
- "$t4", "$t5", "$t6", "$t7", "$t8" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg1; \
})
@@ -43,12 +45,11 @@
register long _num __asm__ ("a7") = (num); \
register long _arg1 __asm__ ("a0") = (long)(arg1); \
\
- __asm__ volatile ( \
+ __asm__ volatile ( \
"syscall 0\n" \
: "+r"(_arg1) \
: "r"(_num) \
- : "memory", "$t0", "$t1", "$t2", "$t3", \
- "$t4", "$t5", "$t6", "$t7", "$t8" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg1; \
})
@@ -59,13 +60,12 @@
register long _arg1 __asm__ ("a0") = (long)(arg1); \
register long _arg2 __asm__ ("a1") = (long)(arg2); \
\
- __asm__ volatile ( \
+ __asm__ volatile ( \
"syscall 0\n" \
: "+r"(_arg1) \
: "r"(_arg2), \
"r"(_num) \
- : "memory", "$t0", "$t1", "$t2", "$t3", \
- "$t4", "$t5", "$t6", "$t7", "$t8" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg1; \
})
@@ -77,13 +77,12 @@
register long _arg2 __asm__ ("a1") = (long)(arg2); \
register long _arg3 __asm__ ("a2") = (long)(arg3); \
\
- __asm__ volatile ( \
+ __asm__ volatile ( \
"syscall 0\n" \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_arg3), \
"r"(_num) \
- : "memory", "$t0", "$t1", "$t2", "$t3", \
- "$t4", "$t5", "$t6", "$t7", "$t8" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg1; \
})
@@ -96,13 +95,12 @@
register long _arg3 __asm__ ("a2") = (long)(arg3); \
register long _arg4 __asm__ ("a3") = (long)(arg4); \
\
- __asm__ volatile ( \
+ __asm__ volatile ( \
"syscall 0\n" \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_arg3), "r"(_arg4), \
"r"(_num) \
- : "memory", "$t0", "$t1", "$t2", "$t3", \
- "$t4", "$t5", "$t6", "$t7", "$t8" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg1; \
})
@@ -116,13 +114,12 @@
register long _arg4 __asm__ ("a3") = (long)(arg4); \
register long _arg5 __asm__ ("a4") = (long)(arg5); \
\
- __asm__ volatile ( \
+ __asm__ volatile ( \
"syscall 0\n" \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
"r"(_num) \
- : "memory", "$t0", "$t1", "$t2", "$t3", \
- "$t4", "$t5", "$t6", "$t7", "$t8" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg1; \
})
@@ -137,67 +134,29 @@
register long _arg5 __asm__ ("a4") = (long)(arg5); \
register long _arg6 __asm__ ("a5") = (long)(arg6); \
\
- __asm__ volatile ( \
+ __asm__ volatile ( \
"syscall 0\n" \
: "+r"(_arg1) \
: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \
"r"(_num) \
- : "memory", "$t0", "$t1", "$t2", "$t3", \
- "$t4", "$t5", "$t6", "$t7", "$t8" \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_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
/* startup code */
-void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_stack_protector _start(void)
+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();
}
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