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[XenPPC] [xenppc-unstable] [X86EMUL] Mark MOV instruction as not needing

from [Xen patchbot-xenppc-unstable] [Permanent Link][Original]
To: xen-ppc-devel@xxxxxxxxxxxxxxxxxxx
Subject: [XenPPC] [xenppc-unstable] [X86EMUL] Mark MOV instruction as not needing writeback.
From: Xen patchbot-xenppc-unstable <patchbot-xenppc-unstable@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 06 Jun 2006 20:05:38 +0000
Delivery-date: Tue, 06 Jun 2006 13:07:24 -0700
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# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxxxx
# Node ID 89d7acdd8951342c1d75a5485f732f8164e5ccb1
# Parent  5e3827f7a93a96a1d043cb0e523a0f821830af94
[X86EMUL] Mark MOV instruction as not needing writeback.
Fix the test harness for x86/64 -- map emulated addresses
to low 4GB of address space.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 tools/tests/test_x86_emulator.c |  131 +++++++++++++++++++++++-----------------
 xen/arch/x86/x86_emulate.c      |    4 -
 2 files changed, 80 insertions(+), 55 deletions(-)

diff -r 5e3827f7a93a -r 89d7acdd8951 tools/tests/test_x86_emulator.c
--- a/tools/tests/test_x86_emulator.c   Mon Jun 05 17:17:27 2006 +0100
+++ b/tools/tests/test_x86_emulator.c   Tue Jun 06 08:05:13 2006 +0100
@@ -13,6 +13,7 @@ typedef int64_t            s64;
 typedef int64_t            s64;
 #include <public/xen.h>
 #include <asm-x86/x86_emulate.h>
+#include <sys/mman.h>
 
 static int read_any(
     unsigned long addr,
@@ -85,23 +86,30 @@ int main(int argc, char **argv)
     struct x86_emulate_ctxt ctxt;
     struct cpu_user_regs regs;
     char instr[20] = { 0x01, 0x08 }; /* add %ecx,(%eax) */
-    unsigned int res = 0x7FFFFFFF;
-    u32 cmpxchg8b_res[2] = { 0x12345678, 0x87654321 };
+    unsigned int *res;
     int rc;
 
     ctxt.regs = &regs;
     ctxt.mode = X86EMUL_MODE_PROT32;
 
+    res = mmap((void *)0x100000, 0x1000, PROT_READ|PROT_WRITE,
+               MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
+    if ( res == MAP_FAILED )
+    {
+        fprintf(stderr, "mmap to low address failed\n");
+        exit(1);
+    }
+
     printf("%-40s", "Testing addl %%ecx,(%%eax)...");
     instr[0] = 0x01; instr[1] = 0x08;
     regs.eflags = 0x200;
     regs.eip    = (unsigned long)&instr[0];
     regs.ecx    = 0x12345678;
-    ctxt.cr2    = (unsigned long)&res;
-    res         = 0x7FFFFFFF;
-    rc = x86_emulate_memop(&ctxt, &emulops);
-    if ( (rc != 0) || 
-         (res != 0x92345677) || 
+    ctxt.cr2    = (unsigned long)res;
+    *res        = 0x7FFFFFFF;
+    rc = x86_emulate_memop(&ctxt, &emulops);
+    if ( (rc != 0) || 
+         (*res != 0x92345677) || 
          (regs.eflags != 0xa94) ||
          (regs.eip != (unsigned long)&instr[2]) )
         goto fail;
@@ -116,11 +124,25 @@ int main(int argc, char **argv)
 #else
     regs.ecx    = 0x12345678UL;
 #endif
-    ctxt.cr2    = (unsigned long)&res;
-    rc = x86_emulate_memop(&ctxt, &emulops);
-    if ( (rc != 0) || 
-         (res != 0x92345677) || 
+    ctxt.cr2    = (unsigned long)res;
+    rc = x86_emulate_memop(&ctxt, &emulops);
+    if ( (rc != 0) || 
+         (*res != 0x92345677) || 
          (regs.ecx != 0x8000000FUL) ||
+         (regs.eip != (unsigned long)&instr[2]) )
+        goto fail;
+    printf("okay\n");
+
+    printf("%-40s", "Testing movl (%%eax),%%ecx...");
+    instr[0] = 0x8b; instr[1] = 0x08;
+    regs.eflags = 0x200;
+    regs.eip    = (unsigned long)&instr[0];
+    regs.ecx    = ~0UL;
+    ctxt.cr2    = (unsigned long)res;
+    rc = x86_emulate_memop(&ctxt, &emulops);
+    if ( (rc != 0) || 
+         (*res != 0x92345677) || 
+         (regs.ecx != 0x92345677UL) ||
          (regs.eip != (unsigned long)&instr[2]) )
         goto fail;
     printf("okay\n");
@@ -131,10 +153,10 @@ int main(int argc, char **argv)
     regs.eip    = (unsigned long)&instr[0];
     regs.eax    = 0x92345677UL;
     regs.ecx    = 0xAA;
-    ctxt.cr2    = (unsigned long)&res;
-    rc = x86_emulate_memop(&ctxt, &emulops);
-    if ( (rc != 0) || 
-         (res != 0x923456AA) || 
+    ctxt.cr2    = (unsigned long)res;
+    rc = x86_emulate_memop(&ctxt, &emulops);
+    if ( (rc != 0) || 
+         (*res != 0x923456AA) || 
          (regs.eflags != 0x244) ||
          (regs.eax != 0x92345677UL) ||
          (regs.eip != (unsigned long)&instr[4]) )
@@ -147,10 +169,10 @@ int main(int argc, char **argv)
     regs.eip    = (unsigned long)&instr[0];
     regs.eax    = 0xAABBCC77UL;
     regs.ecx    = 0xFF;
-    ctxt.cr2    = (unsigned long)&res;
-    rc = x86_emulate_memop(&ctxt, &emulops);
-    if ( (rc != 0) || 
-         (res != 0x923456AA) || 
+    ctxt.cr2    = (unsigned long)res;
+    rc = x86_emulate_memop(&ctxt, &emulops);
+    if ( (rc != 0) || 
+         (*res != 0x923456AA) || 
          ((regs.eflags&0x240) != 0x200) ||
          (regs.eax != 0xAABBCCAA) ||
          (regs.ecx != 0xFF) ||
@@ -163,10 +185,10 @@ int main(int argc, char **argv)
     regs.eflags = 0x200;
     regs.eip    = (unsigned long)&instr[0];
     regs.ecx    = 0x12345678;
-    ctxt.cr2    = (unsigned long)&res;
-    rc = x86_emulate_memop(&ctxt, &emulops);
-    if ( (rc != 0) || 
-         (res != 0x12345678) || 
+    ctxt.cr2    = (unsigned long)res;
+    rc = x86_emulate_memop(&ctxt, &emulops);
+    if ( (rc != 0) || 
+         (*res != 0x12345678) || 
          (regs.eflags != 0x200) ||
          (regs.ecx != 0x923456AA) ||
          (regs.eip != (unsigned long)&instr[2]) )
@@ -176,14 +198,14 @@ int main(int argc, char **argv)
     printf("%-40s", "Testing lock cmpxchgl %%ecx,(%%eax)...");
     instr[0] = 0xf0; instr[1] = 0x0f; instr[2] = 0xb1; instr[3] = 0x08;
     regs.eflags = 0x200;
-    res         = 0x923456AA;
+    *res        = 0x923456AA;
     regs.eip    = (unsigned long)&instr[0];
     regs.eax    = 0x923456AAUL;
     regs.ecx    = 0xDDEEFF00L;
-    ctxt.cr2    = (unsigned long)&res;
-    rc = x86_emulate_memop(&ctxt, &emulops);
-    if ( (rc != 0) || 
-         (res != 0xDDEEFF00) || 
+    ctxt.cr2    = (unsigned long)res;
+    rc = x86_emulate_memop(&ctxt, &emulops);
+    if ( (rc != 0) || 
+         (*res != 0xDDEEFF00) || 
          (regs.eflags != 0x244) ||
          (regs.eax != 0x923456AAUL) ||
          (regs.eip != (unsigned long)&instr[4]) )
@@ -192,54 +214,57 @@ int main(int argc, char **argv)
 
     printf("%-40s", "Testing rep movsw...");
     instr[0] = 0xf3; instr[1] = 0x66; instr[2] = 0xa5;
-    res         = 0x22334455;
+    *res        = 0x22334455;
     regs.eflags = 0x200;
     regs.ecx    = 23;
     regs.eip    = (unsigned long)&instr[0];
-    regs.esi    = (unsigned long)&res + 0;
-    regs.edi    = (unsigned long)&res + 2;
+    regs.esi    = (unsigned long)res + 0;
+    regs.edi    = (unsigned long)res + 2;
     regs.error_code = 0; /* read fault */
     ctxt.cr2    = regs.esi;
     rc = x86_emulate_memop(&ctxt, &emulops);
     if ( (rc != 0) || 
-         (res != 0x44554455) ||
+         (*res != 0x44554455) ||
          (regs.eflags != 0x200) ||
          (regs.ecx != 22) || 
-         (regs.esi != ((unsigned long)&res + 2)) ||
-         (regs.edi != ((unsigned long)&res + 4)) ||
+         (regs.esi != ((unsigned long)res + 2)) ||
+         (regs.edi != ((unsigned long)res + 4)) ||
          (regs.eip != (unsigned long)&instr[0]) )
         goto fail;
     printf("okay\n");
 
     printf("%-40s", "Testing btrl $0x1,(%edi)...");
     instr[0] = 0x0f; instr[1] = 0xba; instr[2] = 0x37; instr[3] = 0x01;
-    res         = 0x2233445F;
-    regs.eflags = 0x200;
-    regs.eip    = (unsigned long)&instr[0];
-    regs.edi    = (unsigned long)&res;
+    *res        = 0x2233445F;
+    regs.eflags = 0x200;
+    regs.eip    = (unsigned long)&instr[0];
+    regs.edi    = (unsigned long)res;
     ctxt.cr2    = regs.edi;
     rc = x86_emulate_memop(&ctxt, &emulops);
     if ( (rc != 0) || 
-         (res != 0x2233445D) ||
+         (*res != 0x2233445D) ||
          ((regs.eflags&0x201) != 0x201) ||
          (regs.eip != (unsigned long)&instr[4]) )
         goto fail;
     printf("okay\n");
+
+    res[0] = 0x12345678;
+    res[1] = 0x87654321;
 
     printf("%-40s", "Testing cmpxchg8b (%edi) [succeeding]...");
     instr[0] = 0x0f; instr[1] = 0xc7; instr[2] = 0x0f;
     regs.eflags = 0x200;
-    regs.eax    = cmpxchg8b_res[0];
-    regs.edx    = cmpxchg8b_res[1];
+    regs.eax    = res[0];
+    regs.edx    = res[1];
     regs.ebx    = 0x9999AAAA;
     regs.ecx    = 0xCCCCFFFF;
     regs.eip    = (unsigned long)&instr[0];
-    regs.edi    = (unsigned long)cmpxchg8b_res;
+    regs.edi    = (unsigned long)res;
     ctxt.cr2    = regs.edi;
     rc = x86_emulate_memop(&ctxt, &emulops);
     if ( (rc != 0) || 
-         (cmpxchg8b_res[0] != 0x9999AAAA) ||
-         (cmpxchg8b_res[1] != 0xCCCCFFFF) ||
+         (res[0] != 0x9999AAAA) ||
+         (res[1] != 0xCCCCFFFF) ||
          ((regs.eflags&0x240) != 0x240) ||
          (regs.eip != (unsigned long)&instr[3]) )
         goto fail;
@@ -248,12 +273,12 @@ int main(int argc, char **argv)
     printf("%-40s", "Testing cmpxchg8b (%edi) [failing]...");
     instr[0] = 0x0f; instr[1] = 0xc7; instr[2] = 0x0f;
     regs.eip    = (unsigned long)&instr[0];
-    regs.edi    = (unsigned long)cmpxchg8b_res;
+    regs.edi    = (unsigned long)res;
     ctxt.cr2    = regs.edi;
     rc = x86_emulate_memop(&ctxt, &emulops);
     if ( (rc != 0) || 
-         (cmpxchg8b_res[0] != 0x9999AAAA) ||
-         (cmpxchg8b_res[1] != 0xCCCCFFFF) ||
+         (res[0] != 0x9999AAAA) ||
+         (res[1] != 0xCCCCFFFF) ||
          (regs.eax != 0x9999AAAA) ||
          (regs.edx != 0xCCCCFFFF) ||
          ((regs.eflags&0x240) != 0x200) ||
@@ -265,11 +290,11 @@ int main(int argc, char **argv)
     instr[0] = 0x0f; instr[1] = 0xbe; instr[2] = 0x08;
     regs.eip    = (unsigned long)&instr[0];
     regs.ecx    = 0x12345678;
-    ctxt.cr2    = (unsigned long)&res;
-    res         = 0x82;
+    ctxt.cr2    = (unsigned long)res;
+    *res        = 0x82;
     rc = x86_emulate_memop(&ctxt, &emulops);
     if ( (rc != 0) ||
-         (res != 0x82) ||
+         (*res != 0x82) ||
          (regs.ecx != 0xFFFFFF82) ||
          ((regs.eflags&0x240) != 0x200) ||
          (regs.eip != (unsigned long)&instr[3]) )
@@ -280,11 +305,11 @@ int main(int argc, char **argv)
     instr[0] = 0x0f; instr[1] = 0xb7; instr[2] = 0x08;
     regs.eip    = (unsigned long)&instr[0];
     regs.ecx    = 0x12345678;
-    ctxt.cr2    = (unsigned long)&res;
-    res         = 0x1234aa82;
+    ctxt.cr2    = (unsigned long)res;
+    *res        = 0x1234aa82;
     rc = x86_emulate_memop(&ctxt, &emulops);
     if ( (rc != 0) ||
-         (res != 0x1234aa82) ||
+         (*res != 0x1234aa82) ||
          (regs.ecx != 0xaa82) ||
          ((regs.eflags&0x240) != 0x200) ||
          (regs.eip != (unsigned long)&instr[3]) )
diff -r 5e3827f7a93a -r 89d7acdd8951 xen/arch/x86/x86_emulate.c
--- a/xen/arch/x86/x86_emulate.c        Mon Jun 05 17:17:27 2006 +0100
+++ b/xen/arch/x86/x86_emulate.c        Tue Jun 06 08:05:13 2006 +0100
@@ -100,8 +100,8 @@ static uint8_t opcode_table[256] = {
     ByteOp|DstMem|SrcReg|ModRM, DstMem|SrcReg|ModRM,
     ByteOp|DstMem|SrcReg|ModRM, DstMem|SrcReg|ModRM,
     /* 0x88 - 0x8F */
-    ByteOp|DstMem|SrcReg|ModRM, DstMem|SrcReg|ModRM,
-    ByteOp|DstReg|SrcMem|ModRM, DstReg|SrcMem|ModRM,
+    ByteOp|DstMem|SrcReg|ModRM|Mov, DstMem|SrcReg|ModRM|Mov,
+    ByteOp|DstReg|SrcMem|ModRM|Mov, DstReg|SrcMem|ModRM|Mov,
     0, 0, 0, DstMem|SrcNone|ModRM|Mov,
     /* 0x90 - 0x9F */
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

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