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-rw-r--r--target/riscv/arch_dump.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/target/riscv/arch_dump.c b/target/riscv/arch_dump.c
new file mode 100644
index 0000000000..709f621d82
--- /dev/null
+++ b/target/riscv/arch_dump.c
@@ -0,0 +1,202 @@
+/* Support for writing ELF notes for RISC-V architectures
+ *
+ * Copyright (C) 2021 Huawei Technologies Co., Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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_regs_struct from arch/riscv/include/uapi/asm/ptrace.h */
+struct riscv64_user_regs {
+ uint64_t pc;
+ uint64_t regs[31];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct riscv64_user_regs) != 256);
+
+/* struct elf_prstatus from include/linux/elfcore.h */
+struct riscv64_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 riscv64_user_regs pr_reg;
+ char pad3[8];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct riscv64_elf_prstatus) != 376);
+
+struct riscv64_note {
+ Elf64_Nhdr hdr;
+ char name[8]; /* align_up(sizeof("CORE"), 4) */
+ struct riscv64_elf_prstatus prstatus;
+} QEMU_PACKED;
+
+#define RISCV64_NOTE_HEADER_SIZE offsetof(struct riscv64_note, prstatus)
+#define RISCV64_PRSTATUS_NOTE_SIZE \
+ (RISCV64_NOTE_HEADER_SIZE + sizeof(struct riscv64_elf_prstatus))
+
+static void riscv64_note_init(struct riscv64_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 riscv_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
+ int cpuid, void *opaque)
+{
+ struct riscv64_note note;
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ DumpState *s = opaque;
+ int ret, i = 0;
+ const char name[] = "CORE";
+
+ riscv64_note_init(&note, s, name, sizeof(name),
+ NT_PRSTATUS, sizeof(note.prstatus));
+
+ note.prstatus.pr_pid = cpu_to_dump32(s, cpuid);
+
+ note.prstatus.pr_reg.pc = cpu_to_dump64(s, env->pc);
+
+ for (i = 0; i < 31; i++) {
+ note.prstatus.pr_reg.regs[i] = cpu_to_dump64(s, env->gpr[i + 1]);
+ }
+
+ ret = f(&note, RISCV64_PRSTATUS_NOTE_SIZE, s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return ret;
+}
+
+struct riscv32_user_regs {
+ uint32_t pc;
+ uint32_t regs[31];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct riscv32_user_regs) != 128);
+
+struct riscv32_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 riscv32_user_regs pr_reg;
+ char pad3[4];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct riscv32_elf_prstatus) != 204);
+
+struct riscv32_note {
+ Elf32_Nhdr hdr;
+ char name[8]; /* align_up(sizeof("CORE"), 4) */
+ struct riscv32_elf_prstatus prstatus;
+} QEMU_PACKED;
+
+#define RISCV32_NOTE_HEADER_SIZE offsetof(struct riscv32_note, prstatus)
+#define RISCV32_PRSTATUS_NOTE_SIZE \
+ (RISCV32_NOTE_HEADER_SIZE + sizeof(struct riscv32_elf_prstatus))
+
+static void riscv32_note_init(struct riscv32_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 riscv_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
+ int cpuid, void *opaque)
+{
+ struct riscv32_note note;
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ DumpState *s = opaque;
+ int ret, i;
+ const char name[] = "CORE";
+
+ riscv32_note_init(&note, s, name, sizeof(name),
+ NT_PRSTATUS, sizeof(note.prstatus));
+
+ note.prstatus.pr_pid = cpu_to_dump32(s, cpuid);
+
+ note.prstatus.pr_reg.pc = cpu_to_dump32(s, env->pc);
+
+ for (i = 0; i < 31; i++) {
+ note.prstatus.pr_reg.regs[i] = cpu_to_dump32(s, env->gpr[i + 1]);
+ }
+
+ ret = f(&note, RISCV32_PRSTATUS_NOTE_SIZE, s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return ret;
+}
+
+int cpu_get_dump_info(ArchDumpInfo *info,
+ const GuestPhysBlockList *guest_phys_blocks)
+{
+ RISCVCPU *cpu;
+ CPURISCVState *env;
+
+ if (first_cpu == NULL) {
+ return -1;
+ }
+ cpu = RISCV_CPU(first_cpu);
+ env = &cpu->env;
+
+ info->d_machine = EM_RISCV;
+
+#if defined(TARGET_RISCV64)
+ info->d_class = ELFCLASS64;
+#else
+ info->d_class = ELFCLASS32;
+#endif
+
+ info->d_endian = (env->mstatus & MSTATUS_UBE) != 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 = RISCV64_PRSTATUS_NOTE_SIZE;
+ } else {
+ note_size = RISCV32_PRSTATUS_NOTE_SIZE;
+ }
+
+ return note_size * nr_cpus;
+}
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