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[Qemu-devel] [PATCH 09/43] windbg: handler of fs/gs register
From: |
Mihail Abakumov |
Subject: |
[Qemu-devel] [PATCH 09/43] windbg: handler of fs/gs register |
Date: |
Tue, 26 Sep 2017 14:04:57 +0300 |
User-agent: |
StGit/0.17.1-dirty |
Added handler of fs/gs register. It tries to find and check KPCR and version
address.
Signed-off-by: Mihail Abakumov <address@hidden>
Signed-off-by: Pavel Dovgalyuk <address@hidden>
Signed-off-by: Dmitriy Koltunov <address@hidden>
---
include/exec/windbgstub-utils.h | 5 +++
windbgstub-utils.c | 63 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 66 insertions(+), 2 deletions(-)
diff --git a/include/exec/windbgstub-utils.h b/include/exec/windbgstub-utils.h
index 90fb766839..f2402ebb34 100755
--- a/include/exec/windbgstub-utils.h
+++ b/include/exec/windbgstub-utils.h
@@ -62,6 +62,11 @@
_t; \
})
+typedef struct InitedAddr {
+ target_ulong addr;
+ bool is_init;
+} InitedAddr;
+
bool windbg_on_load(void);
void windbg_on_exit(void);
diff --git a/windbgstub-utils.c b/windbgstub-utils.c
index b5fb6db3f2..662096647e 100755
--- a/windbgstub-utils.c
+++ b/windbgstub-utils.c
@@ -11,10 +11,69 @@
#include "exec/windbgstub-utils.h"
+#ifdef TARGET_X86_64
+# define OFFSET_SELF_PCR 0x18
+# define OFFSET_VERS 0x108
+#else
+# define OFFSET_SELF_PCR 0x1C
+# define OFFSET_VERS 0x34
+#endif
+
+typedef struct KDData {
+ InitedAddr KPCR;
+ InitedAddr version;
+} KDData;
+
+static KDData *kd;
+
bool windbg_on_load(void)
{
- return false;
+ CPUState *cpu = qemu_get_cpu(0);
+ CPUArchState *env = cpu->env_ptr;
+
+ if (!kd) {
+ kd = g_new0(KDData, 1);
+ }
+
+ if (!kd->KPCR.is_init) {
+
+ #ifdef TARGET_X86_64
+ kd->KPCR.addr = env->segs[R_GS].base;
+ #else
+ kd->KPCR.addr = env->segs[R_FS].base;
+ #endif
+
+ static target_ulong prev_KPCR;
+ if (!kd->KPCR.addr || prev_KPCR == kd->KPCR.addr) {
+ return false;
+ }
+ prev_KPCR = kd->KPCR.addr;
+
+ if (kd->KPCR.addr != READ_VMEM(cpu, kd->KPCR.addr + OFFSET_SELF_PCR,
+ target_ulong)) {
+ return false;
+ }
+
+ kd->KPCR.is_init = true;
+ }
+
+ if (!kd->version.is_init && kd->KPCR.is_init) {
+ kd->version.addr = READ_VMEM(cpu, kd->KPCR.addr + OFFSET_VERS,
+ target_ulong);
+ if (!kd->version.addr) {
+ return false;
+ }
+ kd->version.is_init = true;
+ }
+
+ WINDBG_DEBUG("windbg_on_load: KPCR " FMT_ADDR, kd->KPCR.addr);
+ WINDBG_DEBUG("windbg_on_load: version " FMT_ADDR, kd->version.addr);
+
+ return true;
}
void windbg_on_exit(void)
-{}
+{
+ g_free(kd);
+ kd = NULL;
+}
- [Qemu-devel] [PATCH 03/43] windbg: modified windbgkd.h, (continued)
- [Qemu-devel] [PATCH 03/43] windbg: modified windbgkd.h, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 04/43] windbg: added '-windbg' option, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 05/43] windbg: added helper features, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 06/43] windbg: added WindbgState, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 07/43] windbg: added chardev, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 09/43] windbg: handler of fs/gs register,
Mihail Abakumov <=
- [Qemu-devel] [PATCH 08/43] windbg: hook to wrmsr operation, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 10/43] windbg: structures for parsing data stream, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 12/43] windbg: send data and control packets, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 13/43] windbg: handler of parsing context, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 11/43] windbg: parsing data stream, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 14/43] windbg: init DBGKD_ANY_WAIT_STATE_CHANGE, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 15/43] windbg: sized data buffer, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 16/43] windbg: generate ExceptionStateChange, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 17/43] windbg: generate LoadSymbolsStateChange, Mihail Abakumov, 2017/09/26
- [Qemu-devel] [PATCH 18/43] windbg: windbg_vm_stop, Mihail Abakumov, 2017/09/26