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authorAndrew Jones <drjones@redhat.com>2016-01-11 20:56:22 +0100
committerPeter Maydell <peter.maydell@linaro.org>2016-01-15 14:40:25 +0000
commitda2b91409ffe33f0a59acff1843ce1758325f2ec (patch)
treec925e0d912a0de055f34f6b3cce405dfb801c93d /target-arm
parentb6e05aa473b52e049654fae834453232e6b6e798 (diff)
downloadqemu-arm-da2b91409ffe33f0a59acff1843ce1758325f2ec.tar.gz
target-arm: support QMP dump-guest-memory
Add the support needed for creating prstatus elf notes. This allows us to use QMP dump-guest-memory. Signed-off-by: Andrew Jones <drjones@redhat.com> Message-id: 1452542185-10914-6-git-send-email-drjones@redhat.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> [PMM: moved setting of cpu::write_elf64_note inside !CONFIG_USER_ONLY ifdef to avoid compile failure for linux-user build] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target-arm')
-rw-r--r--target-arm/Makefile.objs3
-rw-r--r--target-arm/arch_dump.c230
-rw-r--r--target-arm/cpu-qom.h5
-rw-r--r--target-arm/cpu.c2
4 files changed, 238 insertions, 2 deletions
diff --git a/target-arm/Makefile.objs b/target-arm/Makefile.objs
index 9460b409a5..a80eb39743 100644
--- a/target-arm/Makefile.objs
+++ b/target-arm/Makefile.objs
@@ -1,5 +1,5 @@
obj-y += arm-semi.o
-obj-$(CONFIG_SOFTMMU) += machine.o
+obj-$(CONFIG_SOFTMMU) += machine.o psci.o arch_dump.o
obj-$(CONFIG_KVM) += kvm.o
obj-$(call land,$(CONFIG_KVM),$(call lnot,$(TARGET_AARCH64))) += kvm32.o
obj-$(call land,$(CONFIG_KVM),$(TARGET_AARCH64)) += kvm64.o
@@ -7,6 +7,5 @@ obj-$(call lnot,$(CONFIG_KVM)) += kvm-stub.o
obj-y += translate.o op_helper.o helper.o cpu.o
obj-y += neon_helper.o iwmmxt_helper.o
obj-y += gdbstub.o
-obj-$(CONFIG_SOFTMMU) += psci.o
obj-$(TARGET_AARCH64) += cpu64.o translate-a64.o helper-a64.o gdbstub64.o
obj-y += crypto_helper.o
diff --git a/target-arm/arch_dump.c b/target-arm/arch_dump.c
new file mode 100644
index 0000000000..f7a4873787
--- /dev/null
+++ b/target-arm/arch_dump.c
@@ -0,0 +1,230 @@
+/* Support for writing ELF notes for ARM architectures
+ *
+ * Copyright (C) 2015 Red Hat Inc.
+ *
+ * Author: Andrew Jones <drjones@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+#include "elf.h"
+#include "sysemu/dump.h"
+
+/* struct user_pt_regs from arch/arm64/include/uapi/asm/ptrace.h */
+struct aarch64_user_regs {
+ uint64_t regs[31];
+ uint64_t sp;
+ uint64_t pc;
+ uint64_t pstate;
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct aarch64_user_regs) != 272);
+
+/* struct elf_prstatus from include/uapi/linux/elfcore.h */
+struct aarch64_elf_prstatus {
+ char pad1[32]; /* 32 == offsetof(struct elf_prstatus, pr_pid) */
+ uint32_t pr_pid;
+ char pad2[76]; /* 76 == offsetof(struct elf_prstatus, pr_reg) -
+ offsetof(struct elf_prstatus, pr_ppid) */
+ struct aarch64_user_regs pr_reg;
+ uint32_t pr_fpvalid;
+ char pad3[4];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct aarch64_elf_prstatus) != 392);
+
+struct aarch64_note {
+ Elf64_Nhdr hdr;
+ char name[8]; /* align_up(sizeof("CORE"), 4) */
+ struct aarch64_elf_prstatus prstatus;
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct aarch64_note) != 412);
+
+static void aarch64_note_init(struct aarch64_note *note, DumpState *s,
+ const char *name, Elf64_Word namesz,
+ Elf64_Word type, Elf64_Word descsz)
+{
+ memset(note, 0, sizeof(*note));
+
+ note->hdr.n_namesz = cpu_to_dump32(s, namesz);
+ note->hdr.n_descsz = cpu_to_dump32(s, descsz);
+ note->hdr.n_type = cpu_to_dump32(s, type);
+
+ memcpy(note->name, name, namesz);
+}
+
+int arm_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
+ int cpuid, void *opaque)
+{
+ struct aarch64_note note;
+ CPUARMState *env = &ARM_CPU(cs)->env;
+ DumpState *s = opaque;
+ uint64_t pstate, sp;
+ int ret, i;
+
+ aarch64_note_init(&note, s, "CORE", 5, NT_PRSTATUS, sizeof(note.prstatus));
+
+ note.prstatus.pr_pid = cpu_to_dump32(s, cpuid);
+
+ if (!is_a64(env)) {
+ aarch64_sync_32_to_64(env);
+ pstate = cpsr_read(env);
+ sp = 0;
+ } else {
+ pstate = pstate_read(env);
+ sp = env->xregs[31];
+ }
+
+ for (i = 0; i < 31; ++i) {
+ note.prstatus.pr_reg.regs[i] = cpu_to_dump64(s, env->xregs[i]);
+ }
+ note.prstatus.pr_reg.sp = cpu_to_dump64(s, sp);
+ note.prstatus.pr_reg.pc = cpu_to_dump64(s, env->pc);
+ note.prstatus.pr_reg.pstate = cpu_to_dump64(s, pstate);
+
+ ret = f(&note, sizeof(note), s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+/* struct pt_regs from arch/arm/include/asm/ptrace.h */
+struct arm_user_regs {
+ uint32_t regs[17];
+ char pad[4];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct arm_user_regs) != 72);
+
+/* struct elf_prstatus from include/uapi/linux/elfcore.h */
+struct arm_elf_prstatus {
+ char pad1[24]; /* 24 == offsetof(struct elf_prstatus, pr_pid) */
+ uint32_t pr_pid;
+ char pad2[44]; /* 44 == offsetof(struct elf_prstatus, pr_reg) -
+ offsetof(struct elf_prstatus, pr_ppid) */
+ struct arm_user_regs pr_reg;
+ uint32_t pr_fpvalid;
+} QEMU_PACKED arm_elf_prstatus;
+
+QEMU_BUILD_BUG_ON(sizeof(struct arm_elf_prstatus) != 148);
+
+struct arm_note {
+ Elf32_Nhdr hdr;
+ char name[8]; /* align_up(sizeof("CORE"), 4) */
+ struct arm_elf_prstatus prstatus;
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct arm_note) != 168);
+
+static void arm_note_init(struct arm_note *note, DumpState *s,
+ const char *name, Elf32_Word namesz,
+ Elf32_Word type, Elf32_Word descsz)
+{
+ memset(note, 0, sizeof(*note));
+
+ note->hdr.n_namesz = cpu_to_dump32(s, namesz);
+ note->hdr.n_descsz = cpu_to_dump32(s, descsz);
+ note->hdr.n_type = cpu_to_dump32(s, type);
+
+ memcpy(note->name, name, namesz);
+}
+
+int arm_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
+ int cpuid, void *opaque)
+{
+ struct arm_note note;
+ CPUARMState *env = &ARM_CPU(cs)->env;
+ DumpState *s = opaque;
+ int ret, i;
+
+ arm_note_init(&note, s, "CORE", 5, NT_PRSTATUS, sizeof(note.prstatus));
+
+ note.prstatus.pr_pid = cpu_to_dump32(s, cpuid);
+
+ for (i = 0; i < 16; ++i) {
+ note.prstatus.pr_reg.regs[i] = cpu_to_dump32(s, env->regs[i]);
+ }
+ note.prstatus.pr_reg.regs[16] = cpu_to_dump32(s, cpsr_read(env));
+
+ ret = f(&note, sizeof(note), s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+int cpu_get_dump_info(ArchDumpInfo *info,
+ const GuestPhysBlockList *guest_phys_blocks)
+{
+ ARMCPU *cpu = ARM_CPU(first_cpu);
+ CPUARMState *env = &cpu->env;
+ GuestPhysBlock *block;
+ hwaddr lowest_addr = ULLONG_MAX;
+
+ /* Take a best guess at the phys_base. If we get it wrong then crash
+ * will need '--machdep phys_offset=<phys-offset>' added to its command
+ * line, which isn't any worse than assuming we can use zero, but being
+ * wrong. This is the same algorithm the crash utility uses when
+ * attempting to guess as it loads non-dumpfile formatted files.
+ */
+ QTAILQ_FOREACH(block, &guest_phys_blocks->head, next) {
+ if (block->target_start < lowest_addr) {
+ lowest_addr = block->target_start;
+ }
+ }
+
+ if (arm_feature(env, ARM_FEATURE_AARCH64)) {
+ info->d_machine = EM_AARCH64;
+ info->d_class = ELFCLASS64;
+ info->page_size = (1 << 16); /* aarch64 max pagesize */
+ if (lowest_addr != ULLONG_MAX) {
+ info->phys_base = lowest_addr;
+ }
+ } else {
+ info->d_machine = EM_ARM;
+ info->d_class = ELFCLASS32;
+ info->page_size = (1 << 12);
+ if (lowest_addr < UINT_MAX) {
+ info->phys_base = lowest_addr;
+ }
+ }
+
+ /* We assume the relevant endianness is that of EL1; this is right
+ * for kernels, but might give the wrong answer if you're trying to
+ * dump a hypervisor that happens to be running an opposite-endian
+ * kernel.
+ */
+ info->d_endian = (env->cp15.sctlr_el[1] & SCTLR_EE) != 0
+ ? ELFDATA2MSB : ELFDATA2LSB;
+
+ return 0;
+}
+
+ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
+{
+ size_t note_size;
+
+ if (class == ELFCLASS64) {
+ note_size = sizeof(struct aarch64_note);
+ } else {
+ note_size = sizeof(struct arm_note);
+ }
+
+ return note_size * nr_cpus;
+}
diff --git a/target-arm/cpu-qom.h b/target-arm/cpu-qom.h
index 25fb1ce0f3..5bd9b7bb9f 100644
--- a/target-arm/cpu-qom.h
+++ b/target-arm/cpu-qom.h
@@ -221,6 +221,11 @@ hwaddr arm_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
int arm_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
int arm_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
+int arm_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
+ int cpuid, void *opaque);
+int arm_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
+ int cpuid, void *opaque);
+
/* Callback functions for the generic timer's timers. */
void arm_gt_ptimer_cb(void *opaque);
void arm_gt_vtimer_cb(void *opaque);
diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 775e0a46bd..450ef78a3d 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -1421,6 +1421,8 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data)
cc->get_phys_page_debug = arm_cpu_get_phys_page_debug;
cc->vmsd = &vmstate_arm_cpu;
cc->virtio_is_big_endian = arm_cpu_is_big_endian;
+ cc->write_elf64_note = arm_cpu_write_elf64_note;
+ cc->write_elf32_note = arm_cpu_write_elf32_note;
#endif
cc->gdb_num_core_regs = 26;
cc->gdb_core_xml_file = "arm-core.xml";