Not committing this yet since KVM does not support I/O breakpoints, but posting
it because it is useful for TCG too.
TCG fails the tests because it doesn't preserve DRn_FIXED_1 on mov to dr6 and
dr7, and also because it lacks support for ICEBP, but it is easy to fix the
former and disable the ICEBP test.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
x86/debug.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/x86/debug.c b/x86/debug.c
index d04de23..a71a8ae 100644
--- a/x86/debug.c
+++ b/x86/debug.c
@@ -11,6 +11,7 @@
#include "libcflat.h"
#include "desc.h"
+#include "processor.h"
static volatile unsigned long bp_addr[10], dr6[10];
static volatile unsigned int n;
@@ -71,6 +72,8 @@ int main(int ac, char **av)
handle_exception(DB_VECTOR, handle_db);
handle_exception(BP_VECTOR, handle_bp);
+ write_cr4(read_cr4() | X86_CR4_DE);
+
sw_bp:
asm volatile("int3");
report("#BP", bp_addr[0] == (unsigned long)&&sw_bp + 1);
@@ -146,5 +149,51 @@ sw_icebp:
bp_addr[0] == (unsigned long)&&sw_icebp + 1 &&
dr6[0] == 0xffff0ff0);
+ n = 0;
+ set_dr1((void *)0xe1ul);
+ set_dr7(0x0020400a);
+ set_dr6(0);
+
+ asm volatile(
+ "out %ax,$0xe0\n\t"
+ "out %al,$0xe1\n\t");
+hw_wp_out1:
+
+ set_dr1((void *)0xe0ul);
+ set_dr7(0x00e0400a);
+ asm volatile(
+ "out %al,$0xe0\n\t");
+hw_wp_out2:
+
+ report("hw I/O port watchpoint (out)",
+ n == 3 &&
+ bp_addr[0] == ((unsigned long)&&hw_wp_out1 - 2) &&
+ bp_addr[1] == ((unsigned long)&&hw_wp_out1) &&
+ bp_addr[2] == ((unsigned long)&&hw_wp_out2) &&
+ dr6[0] == 0xffff0ff2);
+
+ n = 0;
+ set_dr1((void *)0xe1ul);
+ set_dr7(0x0020400a);
+ set_dr6(0);
+
+ asm volatile(
+ "in $0xe0,%%ax\n\t"
+ "in $0xe1,%%al\n\t" : : : "rax");
+hw_wp_in1:
+
+ set_dr1((void *)0xe0ul);
+ set_dr7(0x00e0400a);
+
+ asm volatile(
+ "in $0xe0,%%al\n\t" : : : "rax");
+hw_wp_in2:
+ report("hw I/O port watchpoint (in)",
+ n == 3 &&
+ bp_addr[0] == ((unsigned long)&&hw_wp_in1 - 2) &&
+ bp_addr[1] == ((unsigned long)&&hw_wp_in1) &&
+ bp_addr[2] == ((unsigned long)&&hw_wp_in2) &&
+ dr6[0] == 0xffff0ff2);
+
return report_summary();
}
--
2.5.0
--
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