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proper call clobbers

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This commit is contained in:
Stepan Usatiuk
2023-10-26 23:21:43 +02:00
parent 9fa74148dd
commit eff3c63ecf
1 changed files with 11 additions and 13 deletions
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24
src/kernel/syscalls_interface.c
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@@ -5,22 +5,20 @@
#include "syscalls_interface.h"
#include "syscalls_defs.h"
uint64_t putchar(char c) {
uint64_t do_syscall(uint64_t num, uint64_t a1_rsi) {
uint64_t res;
uint64_t id = SYSCALL_PUTCHAR_ID;
asm("syscall"
: "=r"(res)
: "Di"(id), "Si"(c)
: "memory");
asm volatile("syscall"
: "=r"(res)
: "D"(num), "S"(a1_rsi)
: "cc", "rdx", "rcx", "r8",
"r9", "r10", "r11", "r15", "memory");
return res;
}
uint64_t putchar(char c) {
return do_syscall(SYSCALL_PUTCHAR_ID, c);
}
uint64_t sleep(uint64_t micros) {
uint64_t res;
uint64_t id = SYSCALL_SLEEP_ID;
asm("syscall"
: "=r"(res)
: "Di"(id), "Si"(micros)
: "memory");
return res;
return do_syscall(SYSCALL_SLEEP_ID, micros);
}