[GDB] Add watch and rwatch hardware watchpoints

src/tests/gdbstub_test.S

@@ -1,4 +1,9 @@
 	.arch i386
+
+	.section ".data"
+watch_me:
+	.long 0xfeedbeef
+
 	.section ".text"
 	.code32
 gdbstub_test:
@@ -29,5 +34,21 @@ gdbstub_test:
 	int	$3
 	nop
 
+	/* 6. Access watch test */
+	movl	$0x600d0000, %ecx
+	movl	watch_me, %eax
+	movl	$0xbad00000, %ecx
+	int	$3
+	movl	$0x600d0001, %ecx
+	movl	%eax, watch_me
+	movl	$0xbad00001, %ecx
+	int	$3
+
+	/* 7. Write watch test */
+	movl	$0x600d0002, %ecx
+	movl	%eax, watch_me
+	movl	$0xbad00002, %ecx
+	int	$3
+
 1:
 	jmp	1b

src/tests/gdbstub_test.gdb

@@ -77,6 +77,34 @@ define gpxe_test_step
 	gpxe_assert ({char}($eip-1)) (char)0x90 "gpxe_test_step" # nop = 0x90
 end
 
+define gpxe_test_awatch
+	awatch watch_me
+
+	c
+	gpxe_assert $ecx 0x600d0000 "gpxe_test_awatch"
+	if $ecx == 0x600d0000
+		c
+	end
+
+	c
+	gpxe_assert $ecx 0x600d0001 "gpxe_test_awatch"
+	if $ecx == 0x600d0001
+		c
+	end
+
+	delete
+end
+
+define gpxe_test_watch
+	watch watch_me
+	c
+	gpxe_assert $ecx 0x600d0002 "gpxe_test_watch"
+	if $ecx == 0x600d0002
+		c
+	end
+	delete
+end
+
 gpxe_load_symbols
 gpxe_start_tests
 gpxe_test_regs_read
@@ -84,3 +112,5 @@ gpxe_test_regs_write
 gpxe_test_mem_read
 gpxe_test_mem_write
 gpxe_test_step
+gpxe_test_awatch
+gpxe_test_watch