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hv_exc: Add a hacky STEP feature to interrupt guest after a while

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This should eventually be a proper single step feature or something, but
for now...

Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2021-05-09 03:15:25 +09:00
parent bcdafe8d00
commit ed32cf6328
3 changed files with 7 additions and 0 deletions
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1
proxyclient/proxy.py
View file

@ -91,6 +91,7 @@ class EXC_RET(IntEnum):
UNHANDLED = 1 UNHANDLED = 1
HANDLED = 2 HANDLED = 2
EXIT_GUEST = 3 EXIT_GUEST = 3
STEP = 4
ExcInfo = Struct( ExcInfo = Struct(
"spsr" / RegAdapter(SPSR), "spsr" / RegAdapter(SPSR),

5
src/hv_exc.c
View file

@ -35,12 +35,17 @@ static void hv_exc_proxy(u64 *regs, uartproxy_exc_code_t type)
int ret = uartproxy_run(&start); int ret = uartproxy_run(&start);
switch (ret) { switch (ret) {
case EXC_RET_STEP:
case EXC_RET_HANDLED: case EXC_RET_HANDLED:
memcpy(regs, exc_info.regs, sizeof(exc_info.regs)); memcpy(regs, exc_info.regs, sizeof(exc_info.regs));
msr(SPSR_EL2, exc_info.spsr); msr(SPSR_EL2, exc_info.spsr);
msr(ELR_EL2, exc_info.elr); msr(ELR_EL2, exc_info.elr);
msr(SP_EL0, exc_info.sp[0]); msr(SP_EL0, exc_info.sp[0]);
msr(SP_EL1, exc_info.sp[1]); msr(SP_EL1, exc_info.sp[1]);
if (ret == EXC_RET_STEP) {
msr(CNTV_TVAL_EL0, 256);
msr(CNTV_CTL_EL0, 1);
}
return; return;
case EXC_EXIT_GUEST: case EXC_EXIT_GUEST:
hv_exit_guest(); hv_exit_guest();

1
src/uartproxy.h
View file

@ -24,6 +24,7 @@ typedef enum _uartproxy_exc_ret_t {
EXC_RET_UNHANDLED = 1, EXC_RET_UNHANDLED = 1,
EXC_RET_HANDLED = 2, EXC_RET_HANDLED = 2,
EXC_EXIT_GUEST = 3, EXC_EXIT_GUEST = 3,
EXC_RET_STEP = 4,
} uartproxy_exc_ret_t; } uartproxy_exc_ret_t;
struct uartproxy_exc_info { struct uartproxy_exc_info {