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authorRichard Henderson <rth@twiddle.net>2010-06-04 12:14:12 -0700
committerAurelien Jarno <aurelien@aurel32.net>2010-06-11 18:15:41 +0200
commit6a1621b917352122ad025e102f450de382dae407 (patch)
treebc003fa0cf2a7b7531ab3af9d619e50a6fa90718 /cpu-exec.c
parent4d58be0628bf1d30b8c1b3600f0ce44db1b38b2f (diff)
tcg-s390: Compute is_write in cpu_signal_handler.
Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'cpu-exec.c')
-rw-r--r--cpu-exec.c42
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);
}