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#include <unistd.h>
#include <sys/mman.h>
#include <kjarna/syscall.h>
#include <stdnoreturn.h>
__attribute__((always_inline))
static inline int64_t syscall1(int syscall_index, uint64_t p1)
{
int64_t result;
__asm__ (
"movq %1, %%rax\n"
"movq %2, %%rdi\n"
"syscall\n"
: "=a"(result)
: "g"(syscall_index), "g"(p1)
: "rdi");
return result;
}
__attribute__((always_inline))
static inline int64_t syscall2(int syscall_index, uint64_t p1, uint64_t p2)
{
int64_t result;
__asm__ (
"movq %1, %%rax\n"
"movq %2, %%rdi\n"
"movq %3, %%rsi\n"
"syscall\n"
: "=a"(result)
: "g"(syscall_index), "g"(p1), "g"(p2)
: "rdi", "rsi");
return result;
}
__attribute__((always_inline))
static inline int64_t syscall3(int syscall_index, uint64_t p1, uint64_t p2, uint64_t p3)
{
int64_t result;
__asm__ (
"movq %1, %%rax\n"
"movq %2, %%rdi\n"
"movq %3, %%rsi\n"
"movq %4, %%rdx\n"
"syscall\n"
: "=a"(result)
: "g"(syscall_index), "g"(p1), "g"(p2), "g"(p3)
: "rdi", "rsi","rdx");
return result;
}
__attribute__((always_inline))
static inline int64_t syscall6(int syscall_index, uint64_t p1, uint64_t p2, uint64_t p3, uint64_t p4, uint64_t p5, uint64_t p6)
{
int64_t result;
__asm__ (
"movq %1, %%rax\n"
"movq %2, %%rdi\n"
"movq %3, %%rsi\n"
"movq %4, %%rdx\n"
"movq %5, %%r10\n"
"movq %6, %%r8\n"
"movq %7, %%r9\n"
"syscall\n"
: "=a"(result)
: "g"(syscall_index), "g"(p1), "g"(p2), "g"(p3), "g"(p4), "g"(p5), "g"(p6)
: "rdi", "rsi","rdx", "r10", "r8", "r9");
return result;
}
int open(const char *path, int flags, int mode)
{
return (int)syscall3(SYS_OPEN, (uintptr_t)path, flags, mode);
}
int close(int fd)
{
return (int)syscall1(SYS_CLOSE, fd);
}
off_t lseek(int fd, off_t offset, int whence)
{
return syscall3(SYS_LSEEK, fd, offset, whence);
}
ssize_t read(int fd, void *buffer, size_t length)
{
return syscall3(SYS_READ, fd, (uintptr_t)buffer, length);
}
ssize_t write(int fd, const void *buffer, size_t length)
{
return syscall3(SYS_WRITE, fd, (uintptr_t)buffer, length);
}
void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
{
return (void *)syscall6(SYS_MMAP, (uintptr_t)addr, length, prot, flags, fd, offset);
}
int munmap(void *addr, size_t length)
{
return syscall2(SYS_MUNMAP, (uintptr_t)addr, length);
}
noreturn void _exit(int status)
{
syscall1(SYS_EXIT, status);
while(true);
}
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