arm: Correctly handle watchpoints for BE32 CPUs

In BE32 mode, sub-word size watchpoints can fail to trigger because the
address of the access is adjusted in the opcode helpers before being
compared with the watchpoint registers.  This patch reverses the address
adjustment before performing the comparison with the help of a new CPUClass
hook.

This version of the patch augments and tidies up comments a little.

Signed-off-by: Julian Brown <julian@codesourcery.com>
Message-id: caaf64ffc72f6ae183015337b7afdbd4b8989cb6.1484929304.git.julian@codesourcery.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/exec.c b/exec.c
index 8b9ed73b15..6fa337b8d8 100644
--- a/exec.c
+++ b/exec.c
@@ -2115,6 +2115,7 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
         return;
     }
     vaddr = (cpu->mem_io_vaddr & TARGET_PAGE_MASK) + offset;
+    vaddr = cc->adjust_watchpoint_address(cpu, vaddr, len);
     QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
         if (cpu_watchpoint_address_matches(wp, vaddr, len)
             && (wp->flags & flags)) {