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target-ppc: dump-guest-memory support

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This patch add support for dumping guest memory using dump-guest-memory
monitor command.

Before patch:

(qemu) dump-guest-memory testcrash
this feature or command is not currently supported
(qemu)

After patch:

(qemu) dump-guest-memory testcrash
(qemu)

crash was able to read the file

crash> bt
PID: 0      TASK: c000000000c0d0d0  CPU: 0   COMMAND: "swapper/0"

 R0:  0000000028000084    R1:  c000000000cafa50    R2:  c000000000cb05b0
 R3:  0000000000000000    R4:  c000000000bc4cb0    R5:  0000000000000000
 R6:  001efe93b8000000    R7:  0000000000000000    R8:  0000000000000000
 R9:  b000000000001032    R10: 0000000000000001    R11: 0001eb2117e00d55
....
...

NOTE: Currently crash tools doesn't look at ELF notes in the dump on ppc64.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aneesh Kumar K.V 2013-10-01 21:49:33 +05:30 committed by Alexander Graf
parent bb6b684363
commit e62fbc54d4
5 changed files with 265 additions and 2 deletions
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3
include/elf.h
View File

@ -1359,6 +1359,9 @@ typedef struct elf64_shdr {
#define NT_S390_TODPREG 0x303 /* s390 TOD programmable register */
#define NT_S390_TODCMP 0x302 /* s390 TOD clock comparator register */
#define NT_S390_TIMER 0x301 /* s390 timer register */
#define NT_PPC_VMX 0x100 /* PowerPC Altivec/VMX registers */
#define NT_PPC_SPE 0x101 /* PowerPC SPE/EVR registers */
#define NT_PPC_VSX 0x102 /* PowerPC VSX registers */
/* Note header in a PT_NOTE section */

2
target-ppc/Makefile.objs
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@ -2,7 +2,7 @@ obj-y += cpu-models.o
obj-y += translate.o
ifeq ($(CONFIG_SOFTMMU),y)
obj-y += machine.o mmu_helper.o mmu-hash32.o
obj-$(TARGET_PPC64) += mmu-hash64.o
obj-$(TARGET_PPC64) += mmu-hash64.o arch_dump.o
endif
obj-$(CONFIG_KVM) += kvm.o kvm_ppc.o
obj-$(call lnot,$(CONFIG_KVM)) += kvm-stub.o

253
target-ppc/arch_dump.c Normal file
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@ -0,0 +1,253 @@
/*
* writing ELF notes for ppc64 arch
*
*
* Copyright IBM, Corp. 2013
*
* Authors:
* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include "cpu.h"
#include "elf.h"
#include "exec/cpu-all.h"
#include "sysemu/dump.h"
#include "sysemu/kvm.h"
struct PPC64UserRegStruct {
uint64_t gpr[32];
uint64_t nip;
uint64_t msr;
uint64_t orig_gpr3;
uint64_t ctr;
uint64_t link;
uint64_t xer;
uint64_t ccr;
uint64_t softe;
uint64_t trap;
uint64_t dar;
uint64_t dsisr;
uint64_t result;
} QEMU_PACKED;
struct PPC64ElfPrstatus {
char pad1[112];
struct PPC64UserRegStruct pr_reg;
uint64_t pad2[4];
} QEMU_PACKED;
struct PPC64ElfFpregset {
uint64_t fpr[32];
uint64_t fpscr;
} QEMU_PACKED;
struct PPC64ElfVmxregset {
ppc_avr_t avr[32];
ppc_avr_t vscr;
union {
ppc_avr_t unused;
uint32_t value;
} vrsave;
} QEMU_PACKED;
struct PPC64ElfVsxregset {
uint64_t vsr[32];
} QEMU_PACKED;
struct PPC64ElfSperegset {
uint32_t evr[32];
uint64_t spe_acc;
uint32_t spe_fscr;
} QEMU_PACKED;
typedef struct noteStruct {
Elf64_Nhdr hdr;
char name[5];
char pad3[3];
union {
struct PPC64ElfPrstatus prstatus;
struct PPC64ElfFpregset fpregset;
struct PPC64ElfVmxregset vmxregset;
struct PPC64ElfVsxregset vsxregset;
struct PPC64ElfSperegset speregset;
} contents;
} QEMU_PACKED Note;
static void ppc64_write_elf64_prstatus(Note *note, PowerPCCPU *cpu)
{
int i;
uint64_t cr;
struct PPC64ElfPrstatus *prstatus;
struct PPC64UserRegStruct *reg;
note->hdr.n_type = cpu_to_be32(NT_PRSTATUS);
prstatus = &note->contents.prstatus;
memset(prstatus, 0, sizeof(*prstatus));
reg = &prstatus->pr_reg;
for (i = 0; i < 32; i++) {
reg->gpr[i] = cpu_to_be64(cpu->env.gpr[i]);
}
reg->nip = cpu_to_be64(cpu->env.nip);
reg->msr = cpu_to_be64(cpu->env.msr);
reg->ctr = cpu_to_be64(cpu->env.ctr);
reg->link = cpu_to_be64(cpu->env.lr);
reg->xer = cpu_to_be64(cpu_read_xer(&cpu->env));
cr = 0;
for (i = 0; i < 8; i++) {
cr |= (cpu->env.crf[i] & 15) << (4 * (7 - i));
}
reg->ccr = cpu_to_be64(cr);
}
static void ppc64_write_elf64_fpregset(Note *note, PowerPCCPU *cpu)
{
int i;
struct PPC64ElfFpregset *fpregset;
note->hdr.n_type = cpu_to_be32(NT_PRFPREG);
fpregset = &note->contents.fpregset;
memset(fpregset, 0, sizeof(*fpregset));
for (i = 0; i < 32; i++) {
fpregset->fpr[i] = cpu_to_be64(cpu->env.fpr[i]);
}
fpregset->fpscr = cpu_to_be64(cpu->env.fpscr);
}
static void ppc64_write_elf64_vmxregset(Note *note, PowerPCCPU *cpu)
{
int i;
struct PPC64ElfVmxregset *vmxregset;
note->hdr.n_type = cpu_to_be32(NT_PPC_VMX);
vmxregset = &note->contents.vmxregset;
memset(vmxregset, 0, sizeof(*vmxregset));
for (i = 0; i < 32; i++) {
vmxregset->avr[i].u64[0] = cpu_to_be64(cpu->env.avr[i].u64[0]);
vmxregset->avr[i].u64[1] = cpu_to_be64(cpu->env.avr[i].u64[1]);
}
vmxregset->vscr.u32[3] = cpu_to_be32(cpu->env.vscr);
}
static void ppc64_write_elf64_vsxregset(Note *note, PowerPCCPU *cpu)
{
int i;
struct PPC64ElfVsxregset *vsxregset;
note->hdr.n_type = cpu_to_be32(NT_PPC_VSX);
vsxregset = &note->contents.vsxregset;
memset(vsxregset, 0, sizeof(*vsxregset));
for (i = 0; i < 32; i++) {
vsxregset->vsr[i] = cpu_to_be64(cpu->env.vsr[i]);
}
}
static void ppc64_write_elf64_speregset(Note *note, PowerPCCPU *cpu)
{
struct PPC64ElfSperegset *speregset;
note->hdr.n_type = cpu_to_be32(NT_PPC_SPE);
speregset = &note->contents.speregset;
memset(speregset, 0, sizeof(*speregset));
speregset->spe_acc = cpu_to_be64(cpu->env.spe_acc);
speregset->spe_fscr = cpu_to_be32(cpu->env.spe_fscr);
}
struct NoteFuncDescStruct {
int contents_size;
void (*note_contents_func)(Note *note, PowerPCCPU *cpu);
} note_func[] = {
{sizeof(((Note *)0)->contents.prstatus), ppc64_write_elf64_prstatus},
{sizeof(((Note *)0)->contents.fpregset), ppc64_write_elf64_fpregset},
{sizeof(((Note *)0)->contents.vmxregset), ppc64_write_elf64_vmxregset},
{sizeof(((Note *)0)->contents.vsxregset), ppc64_write_elf64_vsxregset},
{sizeof(((Note *)0)->contents.speregset), ppc64_write_elf64_speregset},
{ 0, NULL}
};
typedef struct NoteFuncDescStruct NoteFuncDesc;
int cpu_get_dump_info(ArchDumpInfo *info,
const struct GuestPhysBlockList *guest_phys_blocks)
{
/*
* Currently only handling PPC64 big endian.
*/
info->d_machine = EM_PPC64;
info->d_endian = ELFDATA2MSB;
info->d_class = ELFCLASS64;
return 0;
}
ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
{
int name_size = 8; /* "CORE" or "QEMU" rounded */
size_t elf_note_size = 0;
int note_head_size;
NoteFuncDesc *nf;
if (class != ELFCLASS64) {
return -1;
}
assert(machine == EM_PPC64);
note_head_size = sizeof(Elf64_Nhdr);
for (nf = note_func; nf->note_contents_func; nf++) {
elf_note_size = elf_note_size + note_head_size + name_size +
nf->contents_size;
}
return (elf_note_size) * nr_cpus;
}
static int ppc64_write_all_elf64_notes(const char *note_name,
WriteCoreDumpFunction f,
PowerPCCPU *cpu, int id,
void *opaque)
{
Note note;
int ret = -1;
int note_size;
NoteFuncDesc *nf;
for (nf = note_func; nf->note_contents_func; nf++) {
note.hdr.n_namesz = cpu_to_be32(sizeof(note.name));
note.hdr.n_descsz = cpu_to_be32(nf->contents_size);
strncpy(note.name, note_name, sizeof(note.name));
(*nf->note_contents_func)(&note, cpu);
note_size = sizeof(note) - sizeof(note.contents) + nf->contents_size;
ret = f(&note, note_size, opaque);
if (ret < 0) {
return -1;
}
}
return 0;
}
int ppc64_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
int cpuid, void *opaque)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
return ppc64_write_all_elf64_notes("CORE", f, cpu, cpuid, opaque);
}
int ppc64_cpu_write_elf64_qemunote(WriteCoreDumpFunction f,
CPUState *cpu, void *opaque)
{
return 0;
}

5
target-ppc/cpu-qom.h
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@ -108,7 +108,10 @@ void ppc_cpu_dump_statistics(CPUState *cpu, FILE *f,
hwaddr ppc_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
int ppc_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
int ppc_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
int ppc64_cpu_write_elf64_qemunote(WriteCoreDumpFunction f,
CPUState *cpu, void *opaque);
int ppc64_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
int cpuid, void *opaque);
#ifndef CONFIG_USER_ONLY
extern const struct VMStateDescription vmstate_ppc_cpu;
#endif

4
target-ppc/translate_init.c
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@ -8572,6 +8572,10 @@ static void ppc_cpu_class_init(ObjectClass *oc, void *data)
#ifndef CONFIG_USER_ONLY
cc->get_phys_page_debug = ppc_cpu_get_phys_page_debug;
cc->vmsd = &vmstate_ppc_cpu;
#if defined(TARGET_PPC64)
cc->write_elf64_note = ppc64_cpu_write_elf64_note;
cc->write_elf64_qemunote = ppc64_cpu_write_elf64_qemunote;
#endif
#endif
cc->gdb_num_core_regs = 71;