diff options
Diffstat (limited to 'cpu-exec.c')
| -rw-r--r-- | cpu-exec.c | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/cpu-exec.c b/cpu-exec.c index c776605e05..026980a552 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -1156,11 +1156,47 @@ int cpu_signal_handler(int host_signum, void *pinfo, siginfo_t *info = pinfo; struct ucontext *uc = puc; unsigned long pc; - int is_write; + uint16_t *pinsn; + int is_write = 0; pc = uc->uc_mcontext.psw.addr; - /* XXX: compute is_write */ - is_write = 0; + + /* ??? On linux, the non-rt signal handler has 4 (!) arguments instead + of the normal 2 arguments. The 3rd argument contains the "int_code" + from the hardware which does in fact contain the is_write value. + The rt signal handler, as far as I can tell, does not give this value + at all. Not that we could get to it from here even if it were. */ + /* ??? This is not even close to complete, since it ignores all + of the read-modify-write instructions. */ + pinsn = (uint16_t *)pc; + switch (pinsn[0] >> 8) { + case 0x50: /* ST */ + case 0x42: /* STC */ + case 0x40: /* STH */ + is_write = 1; + break; + case 0xc4: /* RIL format insns */ + switch (pinsn[0] & 0xf) { + case 0xf: /* STRL */ + case 0xb: /* STGRL */ + case 0x7: /* STHRL */ + is_write = 1; + } + break; + case 0xe3: /* RXY format insns */ + switch (pinsn[2] & 0xff) { + case 0x50: /* STY */ + case 0x24: /* STG */ + case 0x72: /* STCY */ + case 0x70: /* STHY */ + case 0x8e: /* STPQ */ + case 0x3f: /* STRVH */ + case 0x3e: /* STRV */ + case 0x2f: /* STRVG */ + is_write = 1; + } + break; + } return handle_cpu_signal(pc, (unsigned long)info->si_addr, is_write, &uc->uc_sigmask, puc); } |