[Nouveau] [PATCH] x86, mmiotrace: add support for tracing STOS instruction

[Marcin Slusarz]

Signed-off-by: Marcin Slusarz <marcin.slus...@gmail.com>
Cc: Pekka Paalanen <p...@iki.fi>
---
 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);
-- 
1.7.1.1

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