KVM: x86 emulator: simplify emulate_2op_SrcV()

emulate_2op_SrcV(), and its siblings, emulate_2op_SrcV_nobyte()
and emulate_2op_SrcB(), all use the same calling conventions
and all get passed exactly the same parameters.  Simplify them
by passing just the emulation context.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index fe5eb6d..458914d 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -205,64 +205,62 @@ struct gprefix {
 #define ON64(x)
 #endif
 
-#define ____emulate_2op(_op, _src, _dst, _eflags, _x, _y, _suffix, _dsttype) \
+#define ____emulate_2op(ctxt, _op, _x, _y, _suffix, _dsttype)  \
        do {                                                            \
                __asm__ __volatile__ (                                  \
                        _PRE_EFLAGS("0", "4", "2")                      \
                        _op _suffix " %"_x"3,%1; "                      \
                        _POST_EFLAGS("0", "4", "2")                     \
-                       : "=m" (_eflags), "+q" (*(_dsttype*)&(_dst).val),\
+                       : "=m" ((ctxt)->eflags),                        \
+                         "+q" (*(_dsttype*)&(ctxt)->dst.val),          \
                          "=&r" (_tmp)                                  \
-                       : _y ((_src).val), "i" (EFLAGS_MASK));          \
+                       : _y ((ctxt)->src.val), "i" (EFLAGS_MASK));     \
        } while (0)
 
 
 /* Raw emulation: instruction has two explicit operands. */
-#define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \
+#define __emulate_2op_nobyte(ctxt,_op,_wx,_wy,_lx,_ly,_qx,_qy)         \
        do {                                                            \
                unsigned long _tmp;                                     \
                                                                        \
-               switch ((_dst).bytes) {                                 \
+               switch ((ctxt)->dst.bytes) {                            \
                case 2:                                                 \
-                       ____emulate_2op(_op,_src,_dst,_eflags,_wx,_wy,"w",u16);\
+                       ____emulate_2op(ctxt,_op,_wx,_wy,"w",u16);      \
                        break;                                          \
                case 4:                                                 \
-                       ____emulate_2op(_op,_src,_dst,_eflags,_lx,_ly,"l",u32);\
+                       ____emulate_2op(ctxt,_op,_lx,_ly,"l",u32);      \
                        break;                                          \
                case 8:                                                 \
-                       ON64(____emulate_2op(_op,_src,_dst,_eflags,_qx,_qy,"q",u64)); \
+                       ON64(____emulate_2op(ctxt,_op,_qx,_qy,"q",u64)); \
                        break;                                          \
                }                                                       \
        } while (0)
 
-#define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \
+#define __emulate_2op(ctxt,_op,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy)                     \
        do {                                                                 \
                unsigned long _tmp;                                          \
-               switch ((_dst).bytes) {                                      \
+               switch ((ctxt)->dst.bytes) {                                 \
                case 1:                                                      \
-                       ____emulate_2op(_op,_src,_dst,_eflags,_bx,_by,"b",u8); \
+                       ____emulate_2op(ctxt,_op,_bx,_by,"b",u8);            \
                        break;                                               \
                default:                                                     \
-                       __emulate_2op_nobyte(_op, _src, _dst, _eflags,       \
+                       __emulate_2op_nobyte(ctxt, _op,                      \
                                             _wx, _wy, _lx, _ly, _qx, _qy);  \
                        break;                                               \
                }                                                            \
        } while (0)
 
 /* Source operand is byte-sized and may be restricted to just %cl. */
-#define emulate_2op_SrcB(_op, _src, _dst, _eflags)                      \
-       __emulate_2op(_op, _src, _dst, _eflags,                         \
-                     "b", "c", "b", "c", "b", "c", "b", "c")
+#define emulate_2op_SrcB(ctxt, _op)                                    \
+       __emulate_2op(ctxt, _op, "b", "c", "b", "c", "b", "c", "b", "c")
 
 /* Source operand is byte, word, long or quad sized. */
-#define emulate_2op_SrcV(_op, _src, _dst, _eflags)                      \
-       __emulate_2op(_op, _src, _dst, _eflags,                         \
-                     "b", "q", "w", "r", _LO32, "r", "", "r")
+#define emulate_2op_SrcV(ctxt, _op)                                    \
+       __emulate_2op(ctxt, _op, "b", "q", "w", "r", _LO32, "r", "", "r")
 
 /* Source operand is word, long or quad sized. */
-#define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags)               \
-       __emulate_2op_nobyte(_op, _src, _dst, _eflags,                  \
-                            "w", "r", _LO32, "r", "", "r")
+#define emulate_2op_SrcV_nobyte(ctxt, _op)                             \
+       __emulate_2op_nobyte(ctxt, _op, "w", "r", _LO32, "r", "", "r")
 
 /* Instruction has three operands and one operand is stored in ECX register */
 #define __emulate_2op_cl(_op, _cl, _src, _dst, _eflags, _suffix, _type)        \
@@ -1681,26 +1679,26 @@ static int em_grp2(struct x86_emulate_ctxt *ctxt)
 {
        switch (ctxt->modrm_reg) {
        case 0: /* rol */
-               emulate_2op_SrcB("rol", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcB(ctxt, "rol");
                break;
        case 1: /* ror */
-               emulate_2op_SrcB("ror", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcB(ctxt, "ror");
                break;
        case 2: /* rcl */
-               emulate_2op_SrcB("rcl", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcB(ctxt, "rcl");
                break;
        case 3: /* rcr */
-               emulate_2op_SrcB("rcr", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcB(ctxt, "rcr");
                break;
        case 4: /* sal/shl */
        case 6: /* sal/shl */
-               emulate_2op_SrcB("sal", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcB(ctxt, "sal");
                break;
        case 5: /* shr */
-               emulate_2op_SrcB("shr", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcB(ctxt, "shr");
                break;
        case 7: /* sar */
-               emulate_2op_SrcB("sar", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcB(ctxt, "sar");
                break;
        }
        return X86EMUL_CONTINUE;
@@ -1714,7 +1712,7 @@ static int em_grp3(struct x86_emulate_ctxt *ctxt)
 
        switch (ctxt->modrm_reg) {
        case 0 ... 1:   /* test */
-               emulate_2op_SrcV("test", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcV(ctxt, "test");
                break;
        case 2: /* not */
                ctxt->dst.val = ~ctxt->dst.val;
@@ -2459,7 +2457,7 @@ static int em_das(struct x86_emulate_ctxt *ctxt)
        ctxt->src.type = OP_IMM;
        ctxt->src.val = 0;
        ctxt->src.bytes = 1;
-       emulate_2op_SrcV("or", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "or");
        ctxt->eflags &= ~(X86_EFLAGS_AF | X86_EFLAGS_CF);
        if (cf)
                ctxt->eflags |= X86_EFLAGS_CF;
@@ -2509,49 +2507,49 @@ static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
 
 static int em_add(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("add", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "add");
        return X86EMUL_CONTINUE;
 }
 
 static int em_or(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("or", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "or");
        return X86EMUL_CONTINUE;
 }
 
 static int em_adc(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("adc", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "adc");
        return X86EMUL_CONTINUE;
 }
 
 static int em_sbb(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("sbb", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "sbb");
        return X86EMUL_CONTINUE;
 }
 
 static int em_and(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("and", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "and");
        return X86EMUL_CONTINUE;
 }
 
 static int em_sub(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("sub", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "sub");
        return X86EMUL_CONTINUE;
 }
 
 static int em_xor(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("xor", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "xor");
        return X86EMUL_CONTINUE;
 }
 
 static int em_cmp(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("cmp", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "cmp");
        /* Disable writeback. */
        ctxt->dst.type = OP_NONE;
        return X86EMUL_CONTINUE;
@@ -2559,7 +2557,7 @@ static int em_cmp(struct x86_emulate_ctxt *ctxt)
 
 static int em_test(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV("test", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV(ctxt, "test");
        return X86EMUL_CONTINUE;
 }
 
@@ -2577,7 +2575,7 @@ static int em_xchg(struct x86_emulate_ctxt *ctxt)
 
 static int em_imul(struct x86_emulate_ctxt *ctxt)
 {
-       emulate_2op_SrcV_nobyte("imul", ctxt->src, ctxt->dst, ctxt->eflags);
+       emulate_2op_SrcV_nobyte(ctxt, "imul");
        return X86EMUL_CONTINUE;
 }
 
@@ -4121,7 +4119,7 @@ twobyte_insn:
                ctxt->dst.type = OP_NONE;
                /* only subword offset */
                ctxt->src.val &= (ctxt->dst.bytes << 3) - 1;
-               emulate_2op_SrcV_nobyte("bt", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcV_nobyte(ctxt, "bt");
                break;
        case 0xa4: /* shld imm8, r, r/m */
        case 0xa5: /* shld cl, r, r/m */
@@ -4135,7 +4133,7 @@ twobyte_insn:
                break;
        case 0xab:
              bts:              /* bts */
-               emulate_2op_SrcV_nobyte("bts", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcV_nobyte(ctxt, "bts");
                break;
        case 0xac: /* shrd imm8, r, r/m */
        case 0xad: /* shrd cl, r, r/m */
@@ -4150,7 +4148,7 @@ twobyte_insn:
                 */
                ctxt->src.orig_val = ctxt->src.val;
                ctxt->src.val = ctxt->regs[VCPU_REGS_RAX];
-               emulate_2op_SrcV("cmp", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcV(ctxt, "cmp");
                if (ctxt->eflags & EFLG_ZF) {
                        /* Success: write back to memory. */
                        ctxt->dst.val = ctxt->src.orig_val;
@@ -4165,7 +4163,7 @@ twobyte_insn:
                break;
        case 0xb3:
              btr:              /* btr */
-               emulate_2op_SrcV_nobyte("btr", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcV_nobyte(ctxt, "btr");
                break;
        case 0xb4:              /* lfs */
                rc = emulate_load_segment(ctxt, VCPU_SREG_FS);
@@ -4192,7 +4190,7 @@ twobyte_insn:
                break;
        case 0xbb:
              btc:              /* btc */
-               emulate_2op_SrcV_nobyte("btc", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcV_nobyte(ctxt, "btc");
                break;
        case 0xbc: {            /* bsf */
                u8 zf;
@@ -4224,7 +4222,7 @@ twobyte_insn:
                                                        (s16) ctxt->src.val;
                break;
        case 0xc0 ... 0xc1:     /* xadd */
-               emulate_2op_SrcV("add", ctxt->src, ctxt->dst, ctxt->eflags);
+               emulate_2op_SrcV(ctxt, "add");
                /* Write back the register source. */
                ctxt->src.val = ctxt->dst.orig_val;
                write_register_operand(&ctxt->src);