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

    Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
    Cc: Pekka Paalanen <pq@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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