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Align stack pointer to 16 bytes, needed if UVM32_MEMORY_SIZE is not multiple of 16.

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On memory rd trap, set appropriate error code
This commit is contained in:
Toby Jaffey 2025-12-10 23:27:24 +00:00
parent ac1975a820
commit b83fc74c8d
1 changed files with 6 additions and 1 deletions
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7
uvm32/uvm32.c
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@ -74,7 +74,7 @@ void uvm32_init(uvm32_state_t *vmst) {
// setup stack pointer
// la sp, _sstack
// addi sp,sp,-16
vmst->core.regs[2] = (MINIRV32_RAM_IMAGE_OFFSET + UVM32_MEMORY_SIZE) - 16;
vmst->core.regs[2] = ((MINIRV32_RAM_IMAGE_OFFSET + UVM32_MEMORY_SIZE) & ~0xF) - 16; // 16 byte align stack
vmst->core.regs[10] = 0x00; //hart ID
vmst->core.regs[11] = 0;
vmst->core.extraflags |= 3; // Machine-mode.
@ -190,6 +190,7 @@ uint32_t uvm32_run(uvm32_state_t *vmst, uvm32_evt_t *evt, uint32_t instr_meter)
// check data fits in ram
if (mem_offset > UVM32_MEMORY_SIZE) {
setStatusErr(vmst, UVM32_ERR_INTERNAL_CORE);
setup_err_evt(vmst, evt);
}
@ -212,6 +213,10 @@ uint32_t uvm32_run(uvm32_state_t *vmst, uvm32_evt_t *evt, uint32_t instr_meter)
break;
} // end switch(syscall)
} break; // end ecall
case 6:
setStatusErr(vmst, UVM32_ERR_MEM_RD);
setup_err_evt(vmst, evt);
break;
default:
// unhandled exception
setStatusErr(vmst, UVM32_ERR_INTERNAL_CORE);