From: tip-bot for Marcin Slusarz on
Commit-ID: cc05152ab72d7a65e6ea97d286af4f878c8f7371
Gitweb: http://git.kernel.org/tip/cc05152ab72d7a65e6ea97d286af4f878c8f7371
Author: Marcin Slusarz <marcin.slusarz(a)gmail.com>
AuthorDate: Sat, 31 Jul 2010 22:51:01 +0200
Committer: Frederic Weisbecker <fweisbec(a)gmail.com>
CommitDate: Mon, 2 Aug 2010 01:32:01 +0200

x86,mmiotrace: Add support for tracing STOS instruction

Add support for stos access tracing with mmiotrace.

Signed-off-by: Marcin Slusarz <marcin.slusarz(a)gmail.com>
Acked-by: Pekka Paalanen <pq(a)iki.fi>
Cc: Nouveau <nouveau(a)lists.freedesktop.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Ingo Molnar <mingo(a)elte.hu>
Cc: Steven Rostedt <rostedt(a)goodmis.org>
LKML-Reference: <20100731205101.GA5860(a)joi.lan>
Signed-off-by: Frederic Weisbecker <fweisbec(a)gmail.com>
---
arch/x86/mm/pf_in.c | 30 +++++++++++++++++-------------
1 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/arch/x86/mm/pf_in.c b/arch/x86/mm/pf_in.c
index 308e325..38e6d17 100644
--- a/arch/x86/mm/pf_in.c
+++ b/arch/x86/mm/pf_in.c
@@ -40,16 +40,16 @@ static unsigned char prefix_codes[] = {
static unsigned int reg_rop[] = {
0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
};
-static unsigned int reg_wop[] = { 0x88, 0x89 };
+static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
static unsigned int imm_wop[] = { 0xC6, 0xC7 };
/* IA32 Manual 3, 3-432*/
-static unsigned int rw8[] = { 0x88, 0x8A, 0xC6 };
+static unsigned int rw8[] = { 0x88, 0x8A, 0xC6, 0xAA };
static unsigned int rw32[] = {
- 0x89, 0x8B, 0xC7, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
+ 0x89, 0x8B, 0xC7, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
};
-static unsigned int mw8[] = { 0x88, 0x8A, 0xC6, 0xB60F, 0xBE0F };
+static unsigned int mw8[] = { 0x88, 0x8A, 0xC6, 0xB60F, 0xBE0F, 0xAA };
static unsigned int mw16[] = { 0xB70F, 0xBF0F };
-static unsigned int mw32[] = { 0x89, 0x8B, 0xC7 };
+static unsigned int mw32[] = { 0x89, 0x8B, 0xC7, 0xAB };
static unsigned int mw64[] = {};
#else /* not __i386__ */
static unsigned char prefix_codes[] = {
@@ -63,20 +63,20 @@ static unsigned char prefix_codes[] = {
static unsigned int reg_rop[] = {
0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
};
-static unsigned int reg_wop[] = { 0x88, 0x89 };
+static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
static unsigned int imm_wop[] = { 0xC6, 0xC7 };
-static unsigned int rw8[] = { 0xC6, 0x88, 0x8A };
+static unsigned int rw8[] = { 0xC6, 0x88, 0x8A, 0xAA };
static unsigned int rw32[] = {
- 0xC7, 0x89, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
+ 0xC7, 0x89, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
};
/* 8 bit only */
-static unsigned int mw8[] = { 0xC6, 0x88, 0x8A, 0xB60F, 0xBE0F };
+static unsigned int mw8[] = { 0xC6, 0x88, 0x8A, 0xB60F, 0xBE0F, 0xAA };
/* 16 bit only */
static unsigned int mw16[] = { 0xB70F, 0xBF0F };
/* 16 or 32 bit */
static unsigned int mw32[] = { 0xC7 };
/* 16, 32 or 64 bit */
-static unsigned int mw64[] = { 0x89, 0x8B };
+static unsigned int mw64[] = { 0x89, 0x8B, 0xAB };
#endif /* not __i386__ */

struct prefix_bits {
@@ -410,7 +410,6 @@ static unsigned long *get_reg_w32(int no, struct pt_regs *regs)
unsigned long get_ins_reg_val(unsigned long ins_addr, struct pt_regs *regs)
{
unsigned int opcode;
- unsigned char mod_rm;
int reg;
unsigned char *p;
struct prefix_bits prf;
@@ -437,8 +436,13 @@ unsigned long get_ins_reg_val(unsigned long ins_addr, struct pt_regs *regs)
goto err;

do_work:
- mod_rm = *p;
- reg = ((mod_rm >> 3) & 0x7) | (prf.rexr << 3);
+ /* for STOS, source register is fixed */
+ if (opcode == 0xAA || opcode == 0xAB) {
+ reg = arg_AX;
+ } else {
+ unsigned char mod_rm = *p;
+ reg = ((mod_rm >> 3) & 0x7) | (prf.rexr << 3);
+ }
switch (get_ins_reg_width(ins_addr)) {
case 1:
return *get_reg_w8(reg, prf.rex, regs);
--
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