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Add fork support for x86_64

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This commit is contained in:
Lucas Schumacher 2025-04-11 23:50:36 -04:00
parent 80d5606a81
commit 06de3cc17d
1 changed files with 33 additions and 5 deletions
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38
print.c
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@ -30,9 +30,9 @@ long print(const void *buf, long count) {
return 0;
}
#if defined(__aarch64__)
#define CLONE_CHILD_SETTID 0x1000000
#define CLONE_CHILD_CLEARTID 0x200000
#if defined(__aarch64__)
long int fork() {
long int rtn;
long int flags = CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID;
@ -42,8 +42,8 @@ long int fork() {
"mov x0, %1\n" // clone flags
"mov x1, #0\n" // child stack pointer
"mov x2, #0\n" // parent_tidptr
"mov x3, #0\n" // child_tidptr
"mov x4, #0\n" // tls
"mov x3, #0\n" // tls
"mov x4, #0\n" // child_tidptr
"svc #0\n" // Make the syscall
"mov %0, x0\n" // save return value
// Output operands
@ -55,6 +55,34 @@ long int fork() {
);
return rtn;
}
#elif defined(__x86_64__)
long int fork() {
long int rtn;
/*
long int flags = CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID;
asm volatile(
"movq %%rax, 56\n" // syscall number for 'clone' is 56 for x86-64
"movq %%rdi, %1\n" // clone flags
"movq %%rsi, 0\n" // child stack pointer
"movq %%rdx, 0\n" // parent tidptr
"movq %%r10, 0\n" // child tidptr
"movq %%r8, 0\n" // tls
"syscall\n" // syscall
"movq %0, %%rax\n" // save return value
: "=r"(rtn)
: "r"(flags)
: "rax", "rdi", "rsi", "rdx", "r10", "r8", "r9", "r10", "r11"
);
*/
asm volatile(
"syscall\n" // syscall
"movq %0, %%rax\n" // save return value
: "=r"(rtn)
: "a"(57)
:
);
return rtn;
}
#endif
void exit(int status) {
@ -87,7 +115,7 @@ void exit(int status) {
int main() {
#if defined(__aarch64__)
#if defined(__x86_64__) || defined(__aarch64__)
long int pid = fork();
char msg[17] = {' '};
msg[16] = '\n';
@ -99,7 +127,7 @@ int main() {
msg[i] = c;
}
print(msg, 17);
#elif
#else
char *msg = "Hello World!\n";
print(msg, 13);
#endif