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exec.c: Record watchpoint fault address and direction 

When we check whether we've hit a watchpoint we know the address
that we were attempting to access and whether it was a read or a
write. Record this information in the CPUWatchpoint struct so that
target-specific code can report it to the guest.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Peter Maydell 2014-09-12 14:06:48 +01:00
parent 3ee887e8ff
commit 08225676b2
2 changed files with 11 additions and 2 deletions
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7
exec.c
View File

@ -1673,7 +1673,12 @@ static void check_watchpoint(int offset, int len, int flags)
QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
if (cpu_watchpoint_address_matches(wp, vaddr, len)
&& (wp->flags & flags)) {
wp->flags |= BP_WATCHPOINT_HIT;
if (flags == BP_MEM_READ) {
wp->flags |= BP_WATCHPOINT_HIT_READ;
} else {
wp->flags |= BP_WATCHPOINT_HIT_WRITE;
}
wp->hitaddr = vaddr;
if (!cpu->watchpoint_hit) {
cpu->watchpoint_hit = wp;
tb_check_watchpoint(cpu);

6
include/qom/cpu.h
View File

@ -170,6 +170,7 @@ typedef struct CPUBreakpoint {
typedef struct CPUWatchpoint {
vaddr vaddr;
vaddr len;
vaddr hitaddr;
int flags; /* BP_* */
QTAILQ_ENTRY(CPUWatchpoint) entry;
} CPUWatchpoint;
@ -622,9 +623,12 @@ void cpu_single_step(CPUState *cpu, int enabled);
#define BP_MEM_WRITE 0x02
#define BP_MEM_ACCESS (BP_MEM_READ | BP_MEM_WRITE)
#define BP_STOP_BEFORE_ACCESS 0x04
#define BP_WATCHPOINT_HIT 0x08
/* 0x08 currently unused */
#define BP_GDB 0x10
#define BP_CPU 0x20
#define BP_WATCHPOINT_HIT_READ 0x40
#define BP_WATCHPOINT_HIT_WRITE 0x80
#define BP_WATCHPOINT_HIT (BP_WATCHPOINT_HIT_READ | BP_WATCHPOINT_HIT_WRITE)
int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
CPUBreakpoint **breakpoint);