--- /dev/null
+/* 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 "qemu/osdep.h"
+#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 user_fpsimd_state from arch/arm64/include/uapi/asm/ptrace.h
+ *
+ * While the vregs member of user_fpsimd_state is of type __uint128_t,
+ * QEMU uses an array of uint64_t, where the high half of the 128-bit
+ * value is always in the 2n+1'th index. Thus we also break the 128-
+ * bit values into two halves in this reproduction of user_fpsimd_state.
+ */
+struct aarch64_user_vfp_state {
+ uint64_t vregs[64];
+ uint32_t fpsr;
+ uint32_t fpcr;
+ char pad[8];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct aarch64_user_vfp_state) != 528);
+
+struct aarch64_note {
+ Elf64_Nhdr hdr;
+ char name[8]; /* align_up(sizeof("CORE"), 4) */
+ union {
+ struct aarch64_elf_prstatus prstatus;
+ struct aarch64_user_vfp_state vfp;
+ };
+} QEMU_PACKED;
+
+#define AARCH64_NOTE_HEADER_SIZE offsetof(struct aarch64_note, prstatus)
+#define AARCH64_PRSTATUS_NOTE_SIZE \
+ (AARCH64_NOTE_HEADER_SIZE + sizeof(struct aarch64_elf_prstatus))
+#define AARCH64_PRFPREG_NOTE_SIZE \
+ (AARCH64_NOTE_HEADER_SIZE + sizeof(struct aarch64_user_vfp_state))
+
+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);
+}
+
+static int aarch64_write_elf64_prfpreg(WriteCoreDumpFunction f,
+ CPUARMState *env, int cpuid,
+ DumpState *s)
+{
+ struct aarch64_note note;
+ int ret, i;
+
+ aarch64_note_init(¬e, s, "CORE", 5, NT_PRFPREG, sizeof(note.vfp));
+
+ for (i = 0; i < 64; ++i) {
+ note.vfp.vregs[i] = cpu_to_dump64(s, float64_val(env->vfp.regs[i]));
+ }
+
+ if (s->dump_info.d_endian == ELFDATA2MSB) {
+ /* For AArch64 we must always swap the vfp.regs's 2n and 2n+1
+ * entries when generating BE notes, because even big endian
+ * hosts use 2n+1 for the high half.
+ */
+ for (i = 0; i < 32; ++i) {
+ uint64_t tmp = note.vfp.vregs[2*i];
+ note.vfp.vregs[2*i] = note.vfp.vregs[2*i+1];
+ note.vfp.vregs[2*i+1] = tmp;
+ }
+ }
+
+ note.vfp.fpsr = cpu_to_dump32(s, vfp_get_fpsr(env));
+ note.vfp.fpcr = cpu_to_dump32(s, vfp_get_fpcr(env));
+
+ ret = f(¬e, AARCH64_PRFPREG_NOTE_SIZE, s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+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(¬e, s, "CORE", 5, NT_PRSTATUS, sizeof(note.prstatus));
+
+ note.prstatus.pr_pid = cpu_to_dump32(s, cpuid);
+ note.prstatus.pr_fpvalid = cpu_to_dump32(s, 1);
+
+ 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(¬e, AARCH64_PRSTATUS_NOTE_SIZE, s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return aarch64_write_elf64_prfpreg(f, env, cpuid, s);
+}
+
+/* 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 user_vfp from arch/arm/include/asm/user.h */
+struct arm_user_vfp_state {
+ uint64_t vregs[32];
+ uint32_t fpscr;
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct arm_user_vfp_state) != 260);
+
+struct arm_note {
+ Elf32_Nhdr hdr;
+ char name[8]; /* align_up(sizeof("LINUX"), 4) */
+ union {
+ struct arm_elf_prstatus prstatus;
+ struct arm_user_vfp_state vfp;
+ };
+} QEMU_PACKED;
+
+#define ARM_NOTE_HEADER_SIZE offsetof(struct arm_note, prstatus)
+#define ARM_PRSTATUS_NOTE_SIZE \
+ (ARM_NOTE_HEADER_SIZE + sizeof(struct arm_elf_prstatus))
+#define ARM_VFP_NOTE_SIZE \
+ (ARM_NOTE_HEADER_SIZE + sizeof(struct arm_user_vfp_state))
+
+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);
+}
+
+static int arm_write_elf32_vfp(WriteCoreDumpFunction f, CPUARMState *env,
+ int cpuid, DumpState *s)
+{
+ struct arm_note note;
+ int ret, i;
+
+ arm_note_init(¬e, s, "LINUX", 6, NT_ARM_VFP, sizeof(note.vfp));
+
+ for (i = 0; i < 32; ++i) {
+ note.vfp.vregs[i] = cpu_to_dump64(s, float64_val(env->vfp.regs[i]));
+ }
+
+ note.vfp.fpscr = cpu_to_dump32(s, vfp_get_fpscr(env));
+
+ ret = f(¬e, ARM_VFP_NOTE_SIZE, s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+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, fpvalid = !!arm_feature(env, ARM_FEATURE_VFP);
+
+ arm_note_init(¬e, s, "CORE", 5, NT_PRSTATUS, sizeof(note.prstatus));
+
+ note.prstatus.pr_pid = cpu_to_dump32(s, cpuid);
+ note.prstatus.pr_fpvalid = cpu_to_dump32(s, fpvalid);
+
+ 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(¬e, ARM_PRSTATUS_NOTE_SIZE, s);
+ if (ret < 0) {
+ return -1;
+ } else if (fpvalid) {
+ return arm_write_elf32_vfp(f, env, cpuid, s);
+ }
+
+ 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)
+{
+ ARMCPU *cpu = ARM_CPU(first_cpu);
+ CPUARMState *env = &cpu->env;
+ size_t note_size;
+
+ if (class == ELFCLASS64) {
+ note_size = AARCH64_PRSTATUS_NOTE_SIZE;
+ note_size += AARCH64_PRFPREG_NOTE_SIZE;
+ } else {
+ note_size = ARM_PRSTATUS_NOTE_SIZE;
+ if (arm_feature(env, ARM_FEATURE_VFP)) {
+ note_size += ARM_VFP_NOTE_SIZE;
+ }
+ }
+
+ return note_size * nr_cpus;
+}
Code Review / kvmfornfv.git / blobdiff