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Toby Jaffey 2025-12-09 00:15:25 +00:00
parent 136f7a30bd
commit b34b144a8c
1 changed files with 34 additions and 10 deletions
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@ -152,20 +152,39 @@ Here is a full example of a working VM host from [apps/host-mini](apps/host-mini
// Precompiled binary program to print integers // Precompiled binary program to print integers
// This code expects to print via syscall 0x13C (UVM32_SYSCALL_PRINTD in common/uvm32_common_custom.h) // This code expects to print via syscall 0x13C (UVM32_SYSCALL_PRINTD in common/uvm32_common_custom.h)
uint8_t rom[] = { uint8_t rom[] = {
0x23, 0x26, 0x11, 0x00, 0xef, 0x00, 0x00, 0x01, 0x73, 0x50, 0x80, 0x13, 0x23, 0x26, 0x11, 0x00, 0xef, 0x00, 0xc0, 0x00, 0xb7, 0x08, 0x00, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x93, 0x07, 0x00, 0x00, 0x73, 0x00, 0x00, 0x00, 0x37, 0xf5, 0xff, 0xff, 0xb7, 0x15, 0x00, 0x00,
0x13, 0x07, 0xa0, 0x00, 0x73, 0x90, 0xc7, 0x13, 0x93, 0x87, 0x17, 0x00, 0x37, 0xe6, 0xff, 0xff, 0x13, 0x07, 0xf0, 0x01, 0xb7, 0x47, 0x00, 0x00,
0xe3, 0x9c, 0xe7, 0xfe, 0x67, 0x80, 0x00, 0x00 0xb7, 0x06, 0x00, 0x01, 0x13, 0x08, 0xd5, 0xcc, 0x93, 0x82, 0x35, 0x33,
0x13, 0x03, 0x76, 0xe6, 0x93, 0x83, 0x35, 0xb3, 0x13, 0x86, 0x16, 0x00,
0x63, 0xc8, 0x02, 0x09, 0x13, 0x0e, 0x03, 0x00, 0x63, 0xca, 0x63, 0x06,
0x93, 0x0e, 0x00, 0x00, 0x93, 0x05, 0x00, 0x00, 0x13, 0x0f, 0x00, 0x00,
0x93, 0x0f, 0x00, 0x00, 0x93, 0x06, 0x00, 0x02, 0x13, 0x85, 0x06, 0xfe,
0x63, 0x62, 0xa7, 0x04, 0x33, 0x85, 0xd5, 0x01, 0x63, 0xee, 0xa7, 0x02,
0x13, 0x05, 0x00, 0x00, 0x93, 0x08, 0x06, 0x00, 0x33, 0x8f, 0xef, 0x03,
0xb3, 0x8f, 0xd5, 0x41, 0x73, 0x00, 0x00, 0x00, 0x13, 0x5f, 0xbf, 0x40,
0xb3, 0x8f, 0xcf, 0x01, 0x33, 0x0f, 0x0f, 0x01, 0xb3, 0x85, 0xff, 0x03,
0x93, 0xd5, 0xc5, 0x00, 0x33, 0x05, 0xef, 0x03, 0x93, 0x5e, 0xc5, 0x00,
0x93, 0x86, 0x16, 0x00, 0x6f, 0xf0, 0xdf, 0xfb, 0x13, 0x85, 0x06, 0x00,
0x93, 0x08, 0x00, 0x00, 0x73, 0x00, 0x00, 0x00, 0x13, 0x0e, 0x1e, 0x09,
0xe3, 0xda, 0xc3, 0xf9, 0x13, 0x05, 0xa0, 0x00, 0x93, 0x08, 0x00, 0x00,
0x73, 0x00, 0x00, 0x00, 0x13, 0x08, 0x98, 0x19, 0xe3, 0xdc, 0x02, 0xf7,
0x37, 0x05, 0x00, 0x80, 0x13, 0x05, 0x05, 0x0e, 0x93, 0x08, 0x30, 0x00,
0x73, 0x00, 0x00, 0x00, 0x67, 0x80, 0x00, 0x00, 0x48, 0x65, 0x6c, 0x6c,
0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x00
}; };
// Create an identifier for our host handler // Create an identifier for our host handler
// syscalls exposed to vm environement
typedef enum { typedef enum {
F_PRINTD, F_PUTC,
F_PRINTLN,
} f_code_t; } f_code_t;
// Map VM syscall UVM32_SYSCALL_PRINTD (0x13C) to F_PRINTD, tell VM to expect write of a U32 // Map exposed syscalls to syscalls
const uvm32_mapping_t env[] = { const uvm32_mapping_t env[] = {
{ .syscall = UVM32_SYSCALL_PRINTD, .typ = UVM32_SYSCALL_TYP_U32_WR, .code = F_PRINTD }, { .syscall = UVM32_SYSCALL_PRINTLN, .typ = UVM32_SYSCALL_TYP_BUF_TERMINATED_WR, .code = F_PRINTLN },
{ .syscall = UVM32_SYSCALL_PUTC, .typ = UVM32_SYSCALL_TYP_U32_WR, .code = F_PUTC },
}; };
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
@ -185,12 +204,17 @@ int main(int argc, char *argv[]) {
break; break;
case UVM32_EVT_SYSCALL: // vm has paused to handle UVM32_SYSCALL case UVM32_EVT_SYSCALL: // vm has paused to handle UVM32_SYSCALL
switch((f_code_t)evt.data.syscall.code) { switch((f_code_t)evt.data.syscall.code) {
case F_PRINTD: case F_PUTC:
// Type of F_PRINTD is UVM32_SYSCALL_TYP_U32_WR, so expect value in evt.data.syscall.val.u32 printf("%c", evt.data.syscall.val.u32);
printf("%d\n", evt.data.syscall.val.u32); break;
case F_PRINTLN:
printf("%.*s\n", evt.data.syscall.val.buf.len, evt.data.syscall.val.buf.ptr);
break; break;
} }
break; break;
case UVM32_EVT_ERR:
printf("UVM32_EVT_ERR '%s' (%d)\n", evt.data.err.errstr, (int)evt.data.err.errcode);
break;
default: default:
break; break;
} }