[Qemu-devel] [RFC][PATCH 06/14 v7] target-i386: Add API to write cpu status to core file

[Wen Congyang]

The core file has register's value. But it does not include all register.
Store the cpu status into QEMU note, and the user can get more information
from vmcore.

Signed-off-by: Wen Congyang <address@hidden>
---
 cpu-all.h               |   20 ++++++
 target-i386/arch_dump.c |  154 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 174 insertions(+), 0 deletions(-)

diff --git a/cpu-all.h b/cpu-all.h
index f7c6321..ad69269 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -540,6 +540,10 @@ int cpu_write_elf64_note(write_core_dump_function f, 
CPUState *env, int cpuid,
                          target_phys_addr_t *offset, void *opaque);
 int cpu_write_elf32_note(write_core_dump_function f, CPUState *env, int cpuid,
                          target_phys_addr_t *offset, void *opaque);
+int cpu_write_elf64_qemunote(write_core_dump_function f, CPUState *env,
+                             target_phys_addr_t *offset, void *opaque);
+int cpu_write_elf32_qemunote(write_core_dump_function f, CPUState *env,
+                             target_phys_addr_t *offset, void *opaque);
 #else
 static inline int cpu_write_elf64_note(write_core_dump_function f,
                                        CPUState *env, int cpuid,
@@ -554,6 +558,22 @@ static inline int 
cpu_write_elf32_note(write_core_dump_function f,
 {
     return -1;
 }
+
+static inline int cpu_write_elf64_qemunote(write_core_dump_function f,
+                                           CPUState *env,
+                                           target_phys_addr_t *offset,
+                                           void *opaque);
+{
+    return -1;
+}
+
+static inline int cpu_write_elf32_qemunote(write_core_dump_function f,
+                                           CPUState *env,
+                                           target_phys_addr_t *offset,
+                                           void *opaque)
+{
+    return -1;
+}
 #endif
 
 #endif /* CPU_ALL_H */
diff --git a/target-i386/arch_dump.c b/target-i386/arch_dump.c
index 3239c40..560c8a3 100644
--- a/target-i386/arch_dump.c
+++ b/target-i386/arch_dump.c
@@ -247,3 +247,157 @@ int cpu_write_elf32_note(write_core_dump_function f, 
CPUState *env, int cpuid,
 
     return 0;
 }
+
+struct QEMUCPUSegment {
+    uint32_t selector;
+    uint32_t limit;
+    uint32_t flags;
+    uint32_t pad;
+    uint64_t base;
+};
+
+typedef struct QEMUCPUSegment QEMUCPUSegment;
+
+struct QEMUCPUState {
+    uint32_t version;
+    uint32_t size;
+    uint64_t rax, rbx, rcx, rdx, rsi, rdi, rsp, rbp;
+    uint64_t r8, r9, r10, r11, r12, r13, r14, r15;
+    uint64_t rip, rflags;
+    QEMUCPUSegment cs, ds, es, fs, gs, ss;
+    QEMUCPUSegment ldt, tr, gdt, idt;
+    uint64_t cr[5];
+};
+
+typedef struct QEMUCPUState QEMUCPUState;
+
+static void copy_segment(QEMUCPUSegment *d, SegmentCache *s)
+{
+    d->pad = 0;
+    d->selector = s->selector;
+    d->limit = s->limit;
+    d->flags = s->flags;
+    d->base = s->base;
+}
+
+static void qemu_get_cpustate(QEMUCPUState *s, CPUState *env)
+{
+    memset(s, 0, sizeof(QEMUCPUState));
+
+    s->version = 1;
+    s->size = sizeof(QEMUCPUState);
+
+    s->rax = env->regs[R_EAX];
+    s->rbx = env->regs[R_EBX];
+    s->rcx = env->regs[R_ECX];
+    s->rdx = env->regs[R_EDX];
+    s->rsi = env->regs[R_ESI];
+    s->rdi = env->regs[R_EDI];
+    s->rsp = env->regs[R_ESP];
+    s->rbp = env->regs[R_EBP];
+#ifdef TARGET_X86_64
+    s->r8  = env->regs[8];
+    s->r9  = env->regs[9];
+    s->r10 = env->regs[10];
+    s->r11 = env->regs[11];
+    s->r12 = env->regs[12];
+    s->r13 = env->regs[13];
+    s->r14 = env->regs[14];
+    s->r15 = env->regs[15];
+#endif
+    s->rip = env->eip;
+    s->rflags = env->eflags;
+
+    copy_segment(&s->cs, &env->segs[R_CS]);
+    copy_segment(&s->ds, &env->segs[R_DS]);
+    copy_segment(&s->es, &env->segs[R_ES]);
+    copy_segment(&s->fs, &env->segs[R_FS]);
+    copy_segment(&s->gs, &env->segs[R_GS]);
+    copy_segment(&s->ss, &env->segs[R_SS]);
+    copy_segment(&s->ldt, &env->ldt);
+    copy_segment(&s->tr, &env->tr);
+    copy_segment(&s->gdt, &env->gdt);
+    copy_segment(&s->idt, &env->idt);
+
+    s->cr[0] = env->cr[0];
+    s->cr[1] = env->cr[1];
+    s->cr[2] = env->cr[2];
+    s->cr[3] = env->cr[3];
+    s->cr[4] = env->cr[4];
+}
+
+int cpu_write_elf64_qemunote(write_core_dump_function f, CPUState *env,
+                             target_phys_addr_t *offset, void *opaque)
+{
+    QEMUCPUState state;
+    Elf64_Nhdr *note;
+    char *buf;
+    int descsz, note_size, name_size = 5;
+    const char *name = "QEMU";
+    int ret;
+
+    qemu_get_cpustate(&state, env);
+
+    descsz = sizeof(state);
+    note_size = ((sizeof(Elf32_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
+                (descsz + 3) / 4) * 4;
+    note = g_malloc(note_size);
+
+    memset(note, 0, note_size);
+    note->n_namesz = cpu_to_le32(name_size);
+    note->n_descsz = cpu_to_le32(descsz);
+    note->n_type = 0;
+    buf = (char *)note;
+    buf += ((sizeof(Elf32_Nhdr) + 3) / 4) * 4;
+    memcpy(buf, name, name_size);
+    buf += ((name_size + 3) / 4) * 4;
+    memcpy(buf, &state, sizeof(state));
+
+    ret = f(*offset, note, note_size, opaque);
+    g_free(note);
+    if (ret < 0) {
+        return -1;
+    }
+
+    *offset += note_size;
+
+    return 0;
+}
+
+int cpu_write_elf32_qemunote(write_core_dump_function f, CPUState *env,
+                             target_phys_addr_t *offset, void *opaque)
+{
+    QEMUCPUState state;
+    Elf32_Nhdr *note;
+    char *buf;
+    int descsz, note_size, name_size = 5;
+    const char *name = "QEMU";
+    int ret;
+
+    qemu_get_cpustate(&state, env);
+
+    descsz = sizeof(state);
+    note_size = ((sizeof(Elf32_Nhdr) + 3) / 4 + (name_size + 3) / 4 +
+                (descsz + 3) / 4) * 4;
+    note = g_malloc(note_size);
+
+    memset(note, 0, note_size);
+    note->n_namesz = cpu_to_le32(name_size);
+    note->n_descsz = cpu_to_le32(descsz);
+    note->n_type = 0;
+    buf = (char *)note;
+    buf += ((sizeof(Elf32_Nhdr) + 3) / 4) * 4;
+    memcpy(buf, name, name_size);
+    buf += ((name_size + 3) / 4) * 4;
+    memcpy(buf, &state, sizeof(state));
+
+    ret = f(*offset, note, note_size, opaque);
+    g_free(note);
+    if (ret < 0) {
+        return -1;
+    }
+
+    *offset += note_size;
+
+    return 0;
+}
-- 
1.7.1