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ulib Make syscall() safe (add "cc" to clobbers)

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Kamil Kowalczyk
2025-09-20 20:22:53 +02:00
parent d50bdd0051
commit 8a9687c007
1 changed files with 9 additions and 19 deletions
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28
ulib/syscall/syscall.c
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@ -2,26 +2,16 @@
uint64_t syscall(uint64_t num, uint64_t arg1, uint64_t arg2,
uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6) {
uint64_t ret = 0;
asm volatile (
"mov %[SYSNUM], %%rax\n"
"mov %[ARG1], %%rdi\n"
"mov %[ARG2], %%rsi\n"
"mov %[ARG3], %%rdx\n"
"mov %[ARG4], %%r10\n"
"mov %[ARG5], %%r8\n"
"mov %[ARG6], %%r9\n"
uint64_t ret;
asm volatile(
"mov %[a4], %%r10\n"
"mov %[a5], %%r8\n"
"mov %[a6], %%r9\n"
"int $0x80\n"
"mov %%rax, %[RESULT]\n"
: [RESULT]"=r"(ret)
: [SYSNUM]"r"(num),
[ARG1]"r"(arg1),
[ARG2]"r"(arg2),
[ARG3]"r"(arg3),
[ARG4]"r"(arg4),
[ARG5]"r"(arg5),
[ARG6]"r"(arg6)
: "rax", "rdi", "rsi", "rdx", "r10", "r8", "r9", "memory"
: "=a"(ret)
: "a"(num), "D"(arg1), "S"(arg2), "d"(arg3),
[a4]"r"(arg4), [a5]"r"(arg5), [a6]"r"(arg6)
: "r10", "r8", "r9", "memory", "cc"
);
return ret;
}