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Rework syscall ABI.

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Syscalls now accept two parameters, allowing for things like "int count = read(buf, len)"
Rather than providing safe signatures for syscalls, the user is now given helper functions to safely parse incoming values, c-strings and slices.
This commit is contained in:
Toby Jaffey 2025-12-09 21:51:35 +00:00
parent f046a590c0
commit 76fba39a21
28 changed files with 543 additions and 537 deletions
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99
host/host.c
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@ -13,28 +13,6 @@
// stash terminal settings on startup
static struct termios orig_termios;
// syscalls exposed to vm environement
typedef enum {
F_PRINT,
F_PRINTDEC,
F_PRINTHEX,
F_PUTC,
F_PRINTLN,
F_MILLIS,
F_GETC,
} f_code_t;
// Map exposed syscalls to syscalls
const uvm32_mapping_t env[] = {
{ .syscall = UVM32_SYSCALL_PRINTLN, .typ = UVM32_SYSCALL_TYP_BUF_TERMINATED_WR, .code = F_PRINTLN },
{ .syscall = UVM32_SYSCALL_PRINT, .typ = UVM32_SYSCALL_TYP_BUF_TERMINATED_WR, .code = F_PRINT },
{ .syscall = UVM32_SYSCALL_PRINTDEC, .typ = UVM32_SYSCALL_TYP_U32_WR, .code = F_PRINTDEC },
{ .syscall = UVM32_SYSCALL_PRINTHEX, .typ = UVM32_SYSCALL_TYP_U32_WR, .code = F_PRINTHEX },
{ .syscall = UVM32_SYSCALL_PUTC, .typ = UVM32_SYSCALL_TYP_U32_WR, .code = F_PUTC },
{ .syscall = UVM32_SYSCALL_MILLIS, .typ = UVM32_SYSCALL_TYP_U32_RD, .code = F_MILLIS },
{ .syscall = UVM32_SYSCALL_GETC, .typ = UVM32_SYSCALL_TYP_U32_RD, .code = F_GETC },
};
void disableRawMode(void) {
tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios);
printf("\033[?25h"); // show cursor
@ -165,7 +143,8 @@ int main(int argc, char *argv[]) {
return 1;
}
uvm32_init(&vmst, env, sizeof(env) / sizeof(env[0]));
uvm32_init(&vmst);
if (!uvm32_load(&vmst, rom, romlen)) {
printf("load failed!\n");
return 1;
@ -201,52 +180,44 @@ int main(int argc, char *argv[]) {
}
break;
case UVM32_EVT_SYSCALL:
switch((f_code_t)evt.data.syscall.code) {
case F_PRINT:
printf("%.*s", evt.data.syscall.val.buf.len, evt.data.syscall.val.buf.ptr);
break;
case F_PRINTLN:
printf("%.*s\n", evt.data.syscall.val.buf.len, evt.data.syscall.val.buf.ptr);
break;
case F_PRINTDEC:
printf("%d", evt.data.syscall.val.u32);
break;
case F_PUTC:
printf("%c", evt.data.syscall.val.u32);
break;
case F_PRINTHEX:
printf("%08x", evt.data.syscall.val.u32);
break;
case F_GETC: {
uint8_t ch;
if (poll_getch(&ch)) {
*evt.data.syscall.val.u32p = ch;
} else {
*evt.data.syscall.val.u32p = 0xFFFFFFFF; // nothing
switch(evt.data.syscall.code) {
case UVM32_SYSCALL_PRINTBUF: {
uvm32_evt_syscall_buf_t buf = uvm32_getbuf(&vmst, &evt, ARG0, ARG1);
while(buf.len--) {
printf("%02x", *buf.ptr++);
}
} break;
case F_MILLIS: {
case UVM32_SYSCALL_PRINT: {
const char *str = uvm32_getcstr(&vmst, &evt, ARG0);
printf("%s", str);
} break;
case UVM32_SYSCALL_PRINTLN: {
const char *str = uvm32_getcstr(&vmst, &evt, ARG0);
printf("%s\n", str);
} break;
case UVM32_SYSCALL_PRINTDEC:
printf("%d", uvm32_getval(&vmst, &evt, ARG0));
break;
case UVM32_SYSCALL_PUTC:
printf("%c", uvm32_getval(&vmst, &evt, ARG0));
break;
case UVM32_SYSCALL_PRINTHEX:
printf("%d", uvm32_getval(&vmst, &evt, ARG0));
break;
case UVM32_SYSCALL_MILLIS: {
clock_t now = clock() / (CLOCKS_PER_SEC / 1000);
*evt.data.syscall.val.u32p = now - start_time;
uvm32_setval(&vmst, &evt, RET, now - start_time);
} break;
default: // catch any others
switch(evt.data.syscall.typ) {
case UVM32_SYSCALL_TYP_BUF_TERMINATED_WR:
printf("UVM32_SYSCALL_TYP_BUF_TERMINATED_WR code=%d val=", evt.data.syscall.code);
hexdump(evt.data.syscall.val.buf.ptr, evt.data.syscall.val.buf.len);
printf("\n");
break;
case UVM32_SYSCALL_TYP_VOID:
printf("UVM32_SYSCALL_TYP_VOID code=%d\n", evt.data.syscall.code);
break;
case UVM32_SYSCALL_TYP_U32_WR:
printf("UVM32_SYSCALL_TYP_U32_WR code=%d val=%d (0x%08x)\n", evt.data.syscall.code, evt.data.syscall.val.u32, evt.data.syscall.val.u32);
break;
case UVM32_SYSCALL_TYP_U32_RD:
printf("UVM32_SYSCALL_TYP_U32_RD code=%d\n", evt.data.syscall.code);
*evt.data.syscall.val.u32p = 123456;
break;
case UVM32_SYSCALL_GETC: {
uint8_t c;
if (poll_getch(&c)) {
uvm32_setval(&vmst, &evt, RET, c);
} else {
uvm32_setval(&vmst, &evt, RET, 0xFFFFFFFF);
}
} break;
default:
printf("Unhandled syscall 0x%08x\n", evt.data.syscall.code);
break;
}
break;