replay: fix watchpoint processing for reverse debugging

This patch enables reverse debugging with watchpoints.
Reverse continue scans the execution to find the breakpoints
and watchpoints that should fire. It uses helper function
replay_breakpoint() for that. But this function needs to access
icount, which can't be correct in the middle of TB.
Therefore, in case of watchpoint, we have to retranslate the block
to allow this access.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Message-Id: <162072430303.827403.7379783546934958566.stgit@pasha-ThinkPad-X280>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index e1da81ed2f9c80c7c60557e241fb1cbd66dc38ef..1c8717684ab240b6add2454bed546381ca2a1df8 100644 (file)
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -904,6 +904,16 @@ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
         if (watchpoint_address_matches(wp, addr, len)
             && (wp->flags & flags)) {
             if (replay_running_debug()) {
+                /*
+                 * replay_breakpoint reads icount.
+                 * Force recompile to succeed, because icount may
+                 * be read only at the end of the block.
+                 */
+                if (!cpu->can_do_io) {
+                    /* Force execution of one insn next time.  */
+                    cpu->cflags_next_tb = 1 | CF_LAST_IO | curr_cflags(cpu);
+                    cpu_loop_exit_restore(cpu, ra);
+                }
                 /*
                  * Don't process the watchpoints when we are
                  * in a reverse debugging operation.