[Qemu-devel] [RFC][PATCH 5/8 v3] target-i386: Add API to write elf notes to core file

[Wen Congyang <wency@cn.fujitsu.com>]

The core file contains register's value. These API write registers to
core file, and them will be called in the following patch.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 cpu-all.h               |    6 +
 target-i386/arch-dump.c |  246 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 252 insertions(+), 0 deletions(-)

diff --git a/cpu-all.h b/cpu-all.h
index a1f3bc2..038934d 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -587,8 +587,14 @@ int cpu_memory_rw_debug(CPUState *env, target_ulong addr,
 
 #if defined(TARGET_I386)
 void cpu_get_memory_mapping(MemoryMappingList *list, CPUState *env);
+int cpu_write_elf64_note(Monitor *mon, int fd, CPUState *env, int cpuid,
+                         target_phys_addr_t *offset);
+int cpu_write_elf32_note(Monitor *mon, int fd, CPUState *env, int cpuid,
+                         target_phys_addr_t *offset);
 #else
 #define cpu_get_memory_mapping(list, env)
+#define cpu_write_elf64_note(mon, fd, env, cpuid, offset) ({ -1; })
+#define cpu_write_elf32_note(mon, fd, env, cpuid, offset) ({ -1; })
 #endif
 
 #endif /* CPU_ALL_H */
diff --git a/target-i386/arch-dump.c b/target-i386/arch-dump.c
index 2e921c7..4ecb981 100644
--- a/target-i386/arch-dump.c
+++ b/target-i386/arch-dump.c
@@ -11,8 +11,11 @@
  *
  */
 
+#include <elf.h>
+
 #include "cpu.h"
 #include "cpu-all.h"
+#include "monitor.h"
 
 /* PAE Paging or IA-32e Paging */
 static void walk_pte(MemoryMappingList *list, target_phys_addr_t pte_start_addr,
@@ -252,3 +255,246 @@ void cpu_get_memory_mapping(MemoryMappingList *list, CPUState *env)
         walk_pde2(list, pde_addr, env->a20_mask, pse);
     }
 }
+
+#ifdef TARGET_X86_64
+typedef struct {
+    target_ulong r15, r14, r13, r12, rbp, rbx, r11, r10;
+    target_ulong r9, r8, rax, rcx, rdx, rsi, rdi, orig_rax;
+    target_ulong rip, cs, eflags;
+    target_ulong rsp, ss;
+    target_ulong fs_base, gs_base;
+    target_ulong ds, es, fs, gs;
+} x86_64_user_regs_struct;
+
+static int x86_64_write_elf64_note(Monitor *mon, int fd, CPUState *env, int id,
+                                   target_phys_addr_t *offset)
+{
+    x86_64_user_regs_struct regs;
+    Elf64_Nhdr *note;
+    char *buf;
+    int descsz, note_size, name_size = 5;
+    const char *name = "CORE";
+    int ret;
+
+    regs.r15 = env->regs[15];
+    regs.r14 = env->regs[14];
+    regs.r13 = env->regs[13];
+    regs.r12 = env->regs[12];
+    regs.r11 = env->regs[11];
+    regs.r10 = env->regs[10];
+    regs.r9  = env->regs[9];
+    regs.r8  = env->regs[8];
+    regs.rbp = env->regs[R_EBP];
+    regs.rsp = env->regs[R_ESP];
+    regs.rdi = env->regs[R_EDI];
+    regs.rsi = env->regs[R_ESI];
+    regs.rdx = env->regs[R_EDX];
+    regs.rcx = env->regs[R_ECX];
+    regs.rbx = env->regs[R_EBX];
+    regs.rax = env->regs[R_EAX];
+    regs.rip = env->eip;
+    regs.eflags = env->eflags;
+
+    regs.orig_rax = 0; /* FIXME */
+    regs.cs = env->segs[R_CS].selector;
+    regs.ss = env->segs[R_SS].selector;
+    regs.fs_base = env->segs[R_FS].base;
+    regs.gs_base = env->segs[R_GS].base;
+    regs.ds = env->segs[R_DS].selector;
+    regs.es = env->segs[R_ES].selector;
+    regs.fs = env->segs[R_FS].selector;
+    regs.gs = env->segs[R_GS].selector;
+
+    descsz = 336; /* sizeof(prstatus_t) is 336 on x86_64 box */
+    note_size = ((sizeof(Elf64_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 = cpu_to_le32(NT_PRSTATUS);
+    buf = (char *)note;
+    buf += ((sizeof(Elf64_Nhdr) + 3) / 4) * 4;
+    memcpy(buf, name, name_size);
+    buf += ((name_size + 3) / 4) * 4;
+    memcpy(buf + 32, &id, 4); /* pr_pid */
+    buf += descsz - sizeof(x86_64_user_regs_struct)-sizeof(target_ulong);
+    memcpy(buf, &regs, sizeof(x86_64_user_regs_struct));
+
+    lseek(fd, *offset, SEEK_SET);
+    ret = write(fd, note, note_size);
+    g_free(note);
+    if (ret < 0) {
+        monitor_printf(mon, "dump: failed to write elf prstatus.\n");
+        return -1;
+    }
+
+    *offset += note_size;
+
+    return 0;
+}
+#endif
+
+typedef struct {
+    uint32_t ebx, ecx, edx, esi, edi, ebp, eax;
+    unsigned short ds, __ds, es, __es;
+    unsigned short fs, __fs, gs, __gs;
+    uint32_t orig_eax, eip;
+    unsigned short cs, __cs;
+    uint32_t eflags, esp;
+    unsigned short ss, __ss;
+} x86_user_regs_struct;
+
+static int x86_write_elf64_note(Monitor *mon, int fd, CPUState *env, int id,
+                                target_phys_addr_t *offset)
+{
+    x86_user_regs_struct regs;
+    Elf64_Nhdr *note;
+    char *buf;
+    int descsz, note_size, name_size = 5;
+    const char *name = "CORE";
+    int ret;
+
+    regs.ebp = env->regs[R_EBP] & 0xffffffff;
+    regs.esp = env->regs[R_ESP] & 0xffffffff;
+    regs.edi = env->regs[R_EDI] & 0xffffffff;
+    regs.esi = env->regs[R_ESI] & 0xffffffff;
+    regs.edx = env->regs[R_EDX] & 0xffffffff;
+    regs.ecx = env->regs[R_ECX] & 0xffffffff;
+    regs.ebx = env->regs[R_EBX] & 0xffffffff;
+    regs.eax = env->regs[R_EAX] & 0xffffffff;
+    regs.eip = env->eip & 0xffffffff;
+    regs.eflags = env->eflags & 0xffffffff;
+
+    regs.cs = env->segs[R_CS].selector;
+    regs.__cs = 0;
+    regs.ss = env->segs[R_SS].selector;
+    regs.__ss = 0;
+    regs.ds = env->segs[R_DS].selector;
+    regs.__ds = 0;
+    regs.es = env->segs[R_ES].selector;
+    regs.__es = 0;
+    regs.fs = env->segs[R_FS].selector;
+    regs.__fs = 0;
+    regs.gs = env->segs[R_GS].selector;
+    regs.__gs = 0;
+
+    descsz = 144; /* sizeof(prstatus_t) is 144 on x86 box */
+    note_size = ((sizeof(Elf64_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 = cpu_to_le32(NT_PRSTATUS);
+    buf = (char *)note;
+    buf += ((sizeof(Elf64_Nhdr) + 3) / 4) * 4;
+    memcpy(buf, name, name_size);
+    buf += ((name_size + 3) / 4) * 4;
+    memcpy(buf + 24, &id, 4); /* pr_pid */
+    buf += descsz - sizeof(x86_user_regs_struct)-4;
+    memcpy(buf, &regs, sizeof(x86_user_regs_struct));
+
+    lseek(fd, *offset, SEEK_SET);
+    ret = write(fd, note, note_size);
+    g_free(note);
+    if (ret < 0) {
+        monitor_printf(mon, "dump: failed to write elf prstatus.\n");
+        return -1;
+    }
+
+    *offset += note_size;
+
+    return 0;
+}
+
+static int x86_write_elf32_note(Monitor *mon, int fd, CPUState *env, int id,
+                                target_phys_addr_t *offset)
+{
+    x86_user_regs_struct regs;
+    Elf32_Nhdr *note;
+    char *buf;
+    int descsz, note_size, name_size = 5;
+    const char *name = "CORE";
+    int ret;
+
+    regs.ebp = env->regs[R_EBP] & 0xffffffff;
+    regs.esp = env->regs[R_ESP] & 0xffffffff;
+    regs.edi = env->regs[R_EDI] & 0xffffffff;
+    regs.esi = env->regs[R_ESI] & 0xffffffff;
+    regs.edx = env->regs[R_EDX] & 0xffffffff;
+    regs.ecx = env->regs[R_ECX] & 0xffffffff;
+    regs.ebx = env->regs[R_EBX] & 0xffffffff;
+    regs.eax = env->regs[R_EAX] & 0xffffffff;
+    regs.eip = env->eip & 0xffffffff;
+    regs.eflags = env->eflags & 0xffffffff;
+
+    regs.cs = env->segs[R_CS].selector;
+    regs.__cs = 0;
+    regs.ss = env->segs[R_SS].selector;
+    regs.__ss = 0;
+    regs.ds = env->segs[R_DS].selector;
+    regs.__ds = 0;
+    regs.es = env->segs[R_ES].selector;
+    regs.__es = 0;
+    regs.fs = env->segs[R_FS].selector;
+    regs.__fs = 0;
+    regs.gs = env->segs[R_GS].selector;
+    regs.__gs = 0;
+
+    descsz = 144; /* sizeof(prstatus_t) is 144 on x86 box */
+    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 = cpu_to_le32(NT_PRSTATUS);
+    buf = (char *)note;
+    buf += ((sizeof(Elf32_Nhdr) + 3) / 4) * 4;
+    memcpy(buf, name, name_size);
+    buf += ((name_size + 3) / 4) * 4;
+    memcpy(buf + 24, &id, 4); /* pr_pid */
+    buf += descsz - sizeof(x86_user_regs_struct)-4;
+    memcpy(buf, &regs, sizeof(x86_user_regs_struct));
+
+    lseek(fd, *offset, SEEK_SET);
+    ret = write(fd, note, note_size);
+    g_free(note);
+    if (ret < 0) {
+        monitor_printf(mon, "dump: failed to write elf prstatus.\n");
+        return -1;
+    }
+
+    *offset += note_size;
+
+    return 0;
+}
+
+int cpu_write_elf64_note(Monitor *mon, int fd, CPUState *env, int cpuid,
+                         target_phys_addr_t *offset)
+{
+    int ret;
+#ifdef TARGET_X86_64
+    bool lma = !!(first_cpu->hflags & HF_LMA_MASK);
+
+    if (lma) {
+        ret = x86_64_write_elf64_note(mon, fd, env, cpuid, offset);
+    } else {
+#endif
+        ret = x86_write_elf64_note(mon, fd, env, cpuid, offset);
+#ifdef TARGET_X86_64
+    }
+#endif
+
+    return ret;
+}
+
+int cpu_write_elf32_note(Monitor *mon, int fd, CPUState *env, int cpuid,
+                         target_phys_addr_t *offset)
+{
+    return x86_write_elf32_note(mon, fd, env, cpuid, offset);
+}
-- 
1.7.1