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Make yield a regular syscall taking an argument.

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Allows "wait for interrupt"/"wait for event" type operation where VM code blocks until the host has something for it.
This commit is contained in:
Toby Jaffey 2025-12-10 10:35:18 +00:00
parent d52baca7b2
commit e07eeab043
14 changed files with 88 additions and 24 deletions
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6
uvm32/uvm32.c
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@ -170,14 +170,10 @@ uint32_t uvm32_run(uvm32_state_t *vmst, uvm32_evt_t *evt, uint32_t instr_meter)
case UVM32_SYSCALL_HALT:
setStatus(vmst, UVM32_STATUS_ENDED);
break;
case UVM32_SYSCALL_YIELD:
vmst->ioevt.typ = UVM32_EVT_YIELD;
setStatus(vmst, UVM32_STATUS_PAUSED);
break;
case UVM32_SYSCALL_STACKPROTECT: {
// don't allow errant code to change it once set
if (vmst->stack_canary == (uint8_t *)UVM32_NULL) {
uint32_t param0 = vmst->core.regs[10];
uint32_t param0 = vmst->core.regs[10]; // a0
uint32_t mem_offset = param0 - MINIRV32_RAM_IMAGE_OFFSET;
// check data fits in ram

1
uvm32/uvm32.h
View file

@ -26,7 +26,6 @@ typedef enum {
typedef enum {
UVM32_EVT_ERR,
UVM32_EVT_SYSCALL,
UVM32_EVT_YIELD,
UVM32_EVT_END,
} uvm32_evt_typ_t;