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|
#import "Basic";
#import "POSIX";
// This prototype is suposed to allow me to use the "open" posix syscall
// that returns a file-descriptor (fd) that can then be used by the mmap
// syscall that allows to map a file to memory.
//
// Syscall info: https://filippo.io/linux-syscall-table/
main :: () {
//sys_exit(-1);
size_stat, error_stat := sys_stat("./dummy");
print("> dymmy has stat size % widh error %\n", size_stat.st_size, error_stat);
fd, error_open := sys_open("./dummy", O_RDONLY, O_RDONLY);
print("> opened dummy with fd % and errno %\n", fd, error_open);
if fd < 0 return;
//LOOPER :: "\\|/-";
//idx := 0;
//loop: string;
//loop.count = 1;
//for 0..3 {
//sleep_milliseconds(1000);
//loop.data = *LOOPER.data[idx];
//idx = (idx + 1) % LOOPER.count;
//print("\rlooping %", loop);
//}
size_lseek, error_lseek := sys_lseek(fd, 0, SEEK_END);
print("\r> dummy has lseek size % with error %\n", size_lseek, error_lseek);
size_fstat, error_fstat := sys_fstat(fd);
print("\r> dummy has fstat size % with error %\n", size_fstat.st_size, error_fstat);
error_close := sys_close(fd);
print("\r> close(%) with errno %\n", fd, error_close);
print("---\n");
error :s64;
fd, error = sys_open("./fail", O_RDONLY, O_RDONLY);
print("$ open(fail) returned fd % and error %\n", fd, error);
error = sys_close(456);
print("$ close(456) returned error %\n", error);
}
sys_stat :: (path: string) -> result: stat_t, error: s64{
print("\r# sys_stat\n");
#if OS == .LINUX {
SYS_STAT :: 4;
stats: stat_t = ---;
result: s64 = ---;
#if CPU == .X64 {
print("\r# LINUX:ASM\n");
path_p: *s8 = xx path.data;
stats_p := *stats;
#asm SYSCALL_SYSRET {
mov rax: gpr === a, SYS_STAT;
mov rdi: gpr === di, path_p;
mov rsi: gpr === si, stats_p;
syscall
rcx: gpr === c, // Implicitly used by syscall to store RIP
r11: gpr === 11, // Implicitly used by syscall to store RFLAGS
rax, rdi, rsi;
mov result, rax;
}
if result < 0
return .{}, -result; // Error.
else
return stats, 0; // OK.
} else {
print("\r# LINUX:LIBC\n");
path_p: *s8 = xx path.data;
error := syscall(SYS_STAT, path_p, *stats);
if error < 0
return .{}, errno(); // Error.
else
return stats, 0; // OK.
}
} else {
print("TODO Implement this\n"); // TODO Implement this.
}
}
sys_fstat :: (file_descriptor: s64) -> result: stat_t, error: s64{
print("\r# sys_fstat\n");
#if OS == .LINUX {
SYS_FSTAT :: 5;
stats: stat_t = ---;
stats_p := *stats;
result: s64 = ---;
#if CPU == .X64 {
print("\r# LINUX:ASM\n");
#asm SYSCALL_SYSRET {
mov rax: gpr === a, SYS_FSTAT;
mov rdi: gpr === di, file_descriptor;
mov rsi: gpr === si, stats_p;
syscall
rcx: gpr === c, // Implicitly used by syscall to store RIP
r11: gpr === 11, // Implicitly used by syscall to store RFLAGS
rax, rdi, rsi;
mov result, rax;
}
if result < 0
return .{}, -result; // Error.
else
return stats, 0; // OK.
} else {
print("\r# LINUX:LIBC\n");
error := syscall(SYS_FSTAT, file_descriptor, *result);
if error < 0
return .{}, errno(); // Error.
else
return stats, 0; // OK.
}
} else {
print("TODO Implement this\n"); // TODO Implement this.
}
}
sys_lseek :: (file_descriptor: s64, offset: s64, whence: s64) -> offset_location: s64, error: s64 {
print("\r# sys_lseek\n");
#if OS == .LINUX {
SYS_LSEEK :: 8;
result: s64 = ---;
#if CPU == .X64 {
print("\r# LINUX:ASM\n");
#asm SYSCALL_SYSRET {
mov rax: gpr === a, SYS_LSEEK;
mov rdi: gpr === di, file_descriptor;
mov rsi: gpr === si, offset;
mov rdx: gpr === d, whence;
//syscall rcx, r11, rax, rdi, rsi, rdx; // TODO Cleanup?
syscall
rcx: gpr === c, // Implicitly used by syscall to store RIP
r11: gpr === 11, // Implicitly used by syscall to store RFLAGS
rax, rdi, rsi, rdx;
mov result, rax;
}
if result < 0
return -1, -result; // Error.
else
return result, 0; // OK.
} else {
print("\r# LINUX:LIBC\n");
result = syscall(SYS_LSEEK, file_descriptor, offset, whence);
if result < 0
return -1, errno(); // Error.
else
return result, 0; // OK.
}
} else {
print("TODO Implement this\n"); // TODO Implement this.
}
}
sys_open :: (path: string, flags: s64, mode: s64) -> file_descriptor: s64, error: s64 {
print("\r# sys_open\n");
#if OS == .LINUX {
SYS_OPEN :: 2;
data: *s8 = xx path.data;
result: s64 = ---;
#if CPU == .X64 {
print("\r# LINUX:ASM\n");
#asm SYSCALL_SYSRET {
mov rax: gpr === a, SYS_OPEN;
mov rdi: gpr === di, data;
mov rsi: gpr === si, flags;
mov rdx: gpr === d, mode; // TODO Is this really used?
//syscall rcx, r11, rax, rdi, rsi, rdx; // TODO Cleanup?
syscall
rcx: gpr === c, // Implicitly used by syscall to store RIP
r11: gpr === 11, // Implicitly used by syscall to store RFLAGS
rax, rdi, rsi, rdx;
mov result, rax;
}
if result < 0
return -1, -result; // Error.
else
return result, 0; // OK.
} else {
print("\r# LINUX:LIBC\n");
result = syscall(SYS_OPEN, data, flags, mode);
if result < 0
return -1, errno(); // Error.
else
return result, 0; // OK.
}
} else {
print("TODO Implement this\n"); // TODO Implement this.
}
}
sys_close :: (file_descriptor: s64) -> error: s64 {
print("\r# sys_close\n");
#if OS == .LINUX {
SYS_CLOSE :: 3;
result: s64 = ---;
#if CPU == .X64 {
print("\r# LINUX:ASM\n");
#asm SYSCALL_SYSRET {
mov rax: gpr === a, SYS_CLOSE;
mov rdi: gpr === di, file_descriptor;
syscall
rcx: gpr === c, // Implicitly used by syscall to store RIP
r11: gpr === 11, // Implicitly used by syscall to store RFLAGS
rax, rdi;
mov result, rax;
}
return ifx result < 0 then -result else 0;
} else {
print("\r# LINUX:LIBC\n");
result = syscall(SYS_CLOSE, file_descriptor);
return ifx result < 0 then errno() else 0;
}
} else {
print("TODO Implement this\n"); // TODO Implement this.
}
}
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