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// MIT License, Copyright (c) 2020 Marvin Borner
// Syscall implementation
#include <arg.h>
#include <errno.h>
#include <sys.h>
#if defined(userspace)
/**
* Definitions
*/
#define ERRIFY(ret) \
if (ret < 0) { \
errno = -ret; \
return -1; \
} \
errno = 0; \
return ret
s32 sys0(enum sys num);
s32 sys0(enum sys num)
{
int a;
__asm__ volatile("int $0x80" : "=a"(a) : "0"(num));
ERRIFY(a);
}
s32 sys1(enum sys num, int d1);
s32 sys1(enum sys num, int d1)
{
int a;
__asm__ volatile("int $0x80" : "=a"(a) : "0"(num), "b"((int)d1));
ERRIFY(a);
}
s32 sys2(enum sys num, int d1, int d2);
s32 sys2(enum sys num, int d1, int d2)
{
int a;
__asm__ volatile("int $0x80" : "=a"(a) : "0"(num), "b"((int)d1), "c"((int)d2));
ERRIFY(a);
}
s32 sys3(enum sys num, int d1, int d2, int d3);
s32 sys3(enum sys num, int d1, int d2, int d3)
{
int a;
__asm__ volatile("int $0x80"
: "=a"(a)
: "0"(num), "b"((int)d1), "c"((int)d2), "d"((int)d3));
ERRIFY(a);
}
s32 sys4(enum sys num, int d1, int d2, int d3, int d4);
s32 sys4(enum sys num, int d1, int d2, int d3, int d4)
{
int a;
__asm__ volatile("int $0x80"
: "=a"(a)
: "0"(num), "b"((int)d1), "c"((int)d2), "d"((int)d3), "S"((int)d4));
ERRIFY(a);
}
s32 sys5(enum sys num, int d1, int d2, int d3, int d4, int d5);
s32 sys5(enum sys num, int d1, int d2, int d3, int d4, int d5)
{
int a;
__asm__ volatile("int $0x80"
: "=a"(a)
: "0"(num), "b"((int)d1), "c"((int)d2), "d"((int)d3), "S"((int)d4),
"D"((int)d5));
ERRIFY(a);
}
/**
* Syscalls
*/
void *sys_alloc(u32 size)
{
return (void *)sys1(SYS_ALLOC, (int)size);
}
u32 shalloc(u32 size)
{
return (u32)sys1(SYS_SHALLOC, (int)size);
}
void *shaccess(u32 id)
{
return (void *)sys1(SYS_SHACCESS, (int)id);
}
// TODO: Freeing by ptr + size could be a security risk -> only by address!
void sys_free(void *ptr, u32 size)
{
sys2(SYS_FREE, (int)ptr, (int)size);
}
void loop(void)
{
sys0(SYS_LOOP);
}
s32 read(const char *path, void *buf, u32 offset, u32 count)
{
return sys4(SYS_READ, (int)path, (int)buf, (int)offset, (int)count);
}
s32 write(const char *path, const void *buf, u32 offset, u32 count)
{
return sys4(SYS_WRITE, (int)path, (int)buf, (int)offset, (int)count);
}
s32 ioctl(const char *path, ...)
{
va_list ap;
int args[4] = { 0 };
va_start(ap, path);
for (int i = 0; i < 4; i++)
args[i] = va_arg(ap, int);
va_end(ap);
return sys5(SYS_IOCTL, (int)path, args[0], args[1], args[2], args[3]);
}
s32 stat(const char *path, struct stat *buf)
{
return sys2(SYS_STAT, (int)path, (int)buf);
}
s32 poll(const char **files)
{
return sys1(SYS_POLL, (int)files);
}
s32 exec(const char *path, ...)
{
va_list ap;
int args[4] = { 0 };
va_start(ap, path);
for (int i = 0; i < 4; i++)
args[i] = va_arg(ap, int);
va_end(ap);
return sys5(SYS_EXEC, (int)path, args[0], args[1], args[2], args[3]);
}
s32 yield(void)
{
return sys0(SYS_YIELD);
}
static void atexit_trigger(void);
void exit(s32 status)
{
atexit_trigger();
sys1(SYS_EXIT, (int)status);
while (1)
yield();
}
s32 boot(u32 cmd)
{
return sys2(SYS_BOOT, SYS_BOOT_MAGIC, cmd);
}
u32 time(void)
{
return (u32)sys0(SYS_TIME);
}
/**
* At exit
*/
#define ATEXIT_MAX 32
static u32 slot = 0;
static void (*funcs[ATEXIT_MAX])(void) = { 0 };
static void atexit_trigger(void)
{
while (slot-- > 0) {
if (funcs[slot]) {
funcs[slot]();
funcs[slot] = NULL;
}
}
}
void atexit(void (*func)(void))
{
if (slot < ATEXIT_MAX)
funcs[slot++] = func;
}
#endif
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