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libc: aarch64 setjmp, untested

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This commit is contained in:
K. Lange 2023-04-21 16:59:11 +09:00
parent 0621fa81b6
commit 491849427b
2 changed files with 47 additions and 0 deletions
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4
base/usr/include/setjmp.h
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@ -5,7 +5,11 @@
_Begin_C_Header
/* i386 */
#ifdef __aarch64__
#define _JBLEN 32
#else
#define _JBLEN 9
#endif
typedef long long jmp_buf[_JBLEN];

43
libc/arch/aarch64/setjmp.c Normal file
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@ -0,0 +1,43 @@
#include <stdio.h>
#include <setjmp.h>
asm (
".globl setjmp\n"
"setjmp:\n"
"mov x2, sp\n"
"stp x2, x29, [x0]\n"
"stp x30, x1, [x0, (1 * 16)]\n"
"stp x19, x20, [x0, (2 * 16)]\n"
"stp x21, x22, [x0, (3 * 16)]\n"
"stp x23, x24, [x0, (4 * 16)]\n"
"stp x25, x26, [x0, (5 * 16)]\n"
"stp x27, x28, [x0, (6 * 16)]\n"
"mov x0, 0\n"
"ret\n"
".globl longjmp\n"
"longjmp:\n"
"ldp x2, x29, [x0]\n"
"ldp x30, x1, [x0, (1 * 16)]\n"
"ldp x19, x20, [x0, (2 * 16)]\n"
"ldp x21, x22, [x0, (3 * 16)]\n"
"ldp x23, x24, [x0, (4 * 16)]\n"
"ldp x25, x26, [x0, (5 * 16)]\n"
"ldp x27, x28, [x0, (6 * 16)]\n"
"mov sp, x2\n"
"mov x0, 1\n"
"ret\n"
);
#if 0
int _setjmp(jmp_buf env);
void _longjmp(jmp_buf env, int val);
int setjmp(jmp_buf env) {
fprintf(stderr, "setjmp called\n");
return _setjmp(env);
}
void longjmp(jmp_buf env, int val) {
fprintf(stderr, "longjmp called\n");
_longjmp(env,val);
}
#endif