1 files changed, 0 insertions, 72 deletions
diff --git a/gitlab/issues_text/target_i386/host_missing/accel_TCG/2495 b/gitlab/issues_text/target_i386/host_missing/accel_TCG/2495
deleted file mode 100644
index 4d6c2322c..000000000
--- a/gitlab/issues_text/target_i386/host_missing/accel_TCG/2495
+++ /dev/null
@@ -1,72 +0,0 @@
-A bug in x86-64 MMX instructions
-Description of problem:
-It seems QEMU emits invalid TCG when lifting MMX instructions with redundant REX prefixes. For example, when lifting `490f7ec0 (movq r8, mm0)`, QEMU generates the following valid TCG.
-
-```
- ---- 00000000004011f2 0000000000000000
- call enter_mmx,$0x0,$0,env
- ld_i64 loc0,env,$0x270
- mov_i64 r8,loc0
- mov_i64 rip,$0x4011f6
- exit_tb $0x0
- set_label $L0
- exit_tb $0x7f84f82ec143
-```
-
-However, after changing the value of the rex prefix to `4f` , so the instruction becomes `4f0f7ec0 (rex.WRXB movq r8, mm0)`, the lifted TCG is changed to:
-
-```
- ---- 00000000004011f2 0000000000000000
- call enter_mmx,$0x0,$0,env
- ld_i64 loc0,env,$0x2f0 // The offset to MM0 is changed
- mov_i64 r8,loc0
- mov_i64 rip,$0x4011f6
- exit_tb $0x0
- set_label $L0
- exit_tb $0x7f98e82ec143
-```
-
-I have observed this bug in numerous MMX instructions. For example, `410fdaff (rex.B pminub mm7, mm7)` is lifted to the wrong TCGs.
-
-It seems this bug looks similar to #2474.
-Steps to reproduce:
-1. Write `test.c` 
-```
-#include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-
-uint8_t i_R8[8] = { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
-uint8_t i_MM0[8] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
-uint8_t o_R8[8];
-
-void __attribute__ ((noinline)) show_state() {
-    printf("R8: ");
-    for (int i = 0; i < 8; i++) {
-        printf("%02x ", o_R8[i]);
-    }
-    printf("\n");
-}
-
-void __attribute__ ((noinline)) run() {
-    __asm__ (
-        ".intel_syntax noprefix\n"
-        "mov r8, qword ptr [rip + i_R8]\n"
-        "movq mm0, qword ptr [rip + i_MM0]\n"
-        ".byte 0x4f, 0x0f, 0x7e, 0xc0\n"
-        "mov qword ptr [rip + o_R8], r8\n"
-        ".att_syntax\n"
-    );
-}
-
-int main(int argc, char **argv) {
-    run();
-    show_state();
-    return 0;
-}
-```    
-2. Compile `test.bin` using this command: `gcc-12 -O2 -no-pie ./test.c -o ./test.bin`
-3. Run QEMU using this command: `qemu-x86_64 ./test.bin` 
-4. The program, runs on top of the buggy QEMU, prints the value of R8 as `00 00 00 00 00 00 00 00`. It should print `ff ff ff ff ff ff ff ff` after the bug is fixed.
-Additional information:
-