Add the support needed for creating prstatus elf notes. Now elf notes only contains user_regs. This allows us to use QMP dump-guest-memory.
Signed-off-by: Yifei Jiang <jiangyi...@huawei.com> Signed-off-by: Mingwang Li <limingw...@huawei.com> --- target/riscv/arch_dump.c | 189 +++++++++++++++++++++++++++++++++++++++ target/riscv/cpu.c | 2 + target/riscv/cpu.h | 4 + target/riscv/cpu_bits.h | 1 + target/riscv/meson.build | 1 + 5 files changed, 197 insertions(+) create mode 100644 target/riscv/arch_dump.c diff --git a/target/riscv/arch_dump.c b/target/riscv/arch_dump.c new file mode 100644 index 0000000000..b89ddf18c7 --- /dev/null +++ b/target/riscv/arch_dump.c @@ -0,0 +1,189 @@ +/* Support for writing ELF notes for RISC-V architectures + * + * Copyright (C) 2020 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 riscv_user_regs { + target_ulong pc; + target_ulong regs[31]; +} QEMU_PACKED; + +/* struct elf_prstatus from include/uapi/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 riscv_user_regs pr_reg; + char pad3[8]; +} QEMU_PACKED; + +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(¬e, 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(¬e, RISCV64_PRSTATUS_NOTE_SIZE, s); + if (ret < 0) { + return -1; + } + + return ret; +} + +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 riscv_user_regs pr_reg; + char pad3[4]; +} QEMU_PACKED; + +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(¬e, 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(¬e, 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; +} diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 6a0264fc6b..69999af813 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -560,6 +560,8 @@ static void riscv_cpu_class_init(ObjectClass *c, void *data) cc->get_phys_page_debug = riscv_cpu_get_phys_page_debug; /* For now, mark unmigratable: */ cc->vmsd = &vmstate_riscv_cpu; + cc->write_elf64_note = riscv_cpu_write_elf64_note; + cc->write_elf32_note = riscv_cpu_write_elf32_note; #endif #ifdef CONFIG_TCG cc->tcg_initialize = riscv_translate_init; diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index c0a326c843..4a340b0c73 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -315,6 +315,10 @@ extern const char * const riscv_intr_names[]; const char *riscv_cpu_get_trap_name(target_ulong cause, bool async); void riscv_cpu_do_interrupt(CPUState *cpu); +int riscv_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs, + int cpuid, void *opaque); +int riscv_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs, + int cpuid, void *opaque); int riscv_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg); int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg); bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request); diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h index 24b24c69c5..d7259561e7 100644 --- a/target/riscv/cpu_bits.h +++ b/target/riscv/cpu_bits.h @@ -368,6 +368,7 @@ #define MSTATUS_MIE 0x00000008 #define MSTATUS_UPIE 0x00000010 #define MSTATUS_SPIE 0x00000020 +#define MSTATUS_UBE 0x00000040 #define MSTATUS_MPIE 0x00000080 #define MSTATUS_SPP 0x00000100 #define MSTATUS_MPP 0x00001800 diff --git a/target/riscv/meson.build b/target/riscv/meson.build index 14a5c62dac..88ab850682 100644 --- a/target/riscv/meson.build +++ b/target/riscv/meson.build @@ -26,6 +26,7 @@ riscv_ss.add(files( riscv_softmmu_ss = ss.source_set() riscv_softmmu_ss.add(files( + 'arch_dump.c', 'pmp.c', 'monitor.c', 'machine.c' -- 2.19.1
