new file mode 100644
@@ -0,0 +1,167 @@
+/*
+ * Support for writing ELF notes for LoongArch architectures
+ *
+ * Copyright (c) 2023 Loongarch Technology
+ *
+ * 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"
+#include "internals.h"
+
+/* struct user_pt_regs from arch/loongarch/include/uapi/asm/ptrace.h */
+struct loongarch_user_regs {
+ uint64_t gpr[32];
+ uint64_t pad1[1];
+ /* Special CSR registers. */
+ uint64_t csr_era;
+ uint64_t csr_badv;
+ uint64_t pad2[10];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct loongarch_user_regs) != 360);
+
+/* struct elf_prstatus from include/uapi/linux/elfcore.h */
+struct loongarch_elf_prstatus {
+ char pad1[32]; /* 32 == offsetof(struct elf_prstatus, pr_pid) */
+ uint32_t pr_pid;
+ /*
+ * 76 == offsetof(struct elf_prstatus, pr_reg) -
+ * offsetof(struct elf_prstatus, pr_ppid)
+ */
+ char pad2[76];
+ struct loongarch_user_regs pr_reg;
+ uint32_t pr_fpvalid;
+ char pad3[4];
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct loongarch_elf_prstatus) != 480);
+
+/* struct user_fp_state from arch/loongarch/include/uapi/asm/ptrace.h */
+struct loongarch_fpu_struct {
+ uint64_t fpr[32];
+ uint64_t fcc;
+ unsigned int fcsr;
+} QEMU_PACKED;
+
+QEMU_BUILD_BUG_ON(sizeof(struct loongarch_fpu_struct) != 268);
+
+struct loongarch_note {
+ Elf64_Nhdr hdr;
+ char name[8]; /* align_up(sizeof("CORE"), 4) */
+ union {
+ struct loongarch_elf_prstatus prstatus;
+ struct loongarch_fpu_struct fpu;
+ };
+} QEMU_PACKED;
+
+#define LOONGARCH_NOTE_HEADER_SIZE offsetof(struct loongarch_note, prstatus)
+#define LOONGARCH_PRSTATUS_NOTE_SIZE \
+ (LOONGARCH_NOTE_HEADER_SIZE + sizeof(struct loongarch_elf_prstatus))
+#define LOONGARCH_PRFPREG_NOTE_SIZE \
+ (LOONGARCH_NOTE_HEADER_SIZE + sizeof(struct loongarch_fpu_struct))
+
+static void loongarch_note_init(struct loongarch_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 loongarch_write_elf64_fprpreg(WriteCoreDumpFunction f,
+ CPULoongArchState *env, int cpuid,
+ DumpState *s)
+{
+ struct loongarch_note note;
+ int ret, i;
+
+ loongarch_note_init(¬e, s, "CORE", 5, NT_PRFPREG, sizeof(note.fpu));
+ note.fpu.fcsr = cpu_to_dump64(s, env->fcsr0);
+
+ for (i = 0; i < 8; i++) {
+ note.fpu.fcc |= env->cf[i] << (8 * i);
+ }
+ note.fpu.fcc = cpu_to_dump64(s, note.fpu.fcc);
+
+ for (i = 0; i < 32; ++i) {
+ note.fpu.fpr[i] = cpu_to_dump64(s, env->fpr[i].vreg.UD[0]);
+ }
+
+ ret = f(¬e, LOONGARCH_PRFPREG_NOTE_SIZE, s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+int loongarch_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
+ int cpuid, DumpState *s)
+{
+ struct loongarch_note note;
+ CPULoongArchState *env = &LOONGARCH_CPU(cs)->env;
+ int ret, i;
+
+ loongarch_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);
+
+ for (i = 0; i < 32; ++i) {
+ note.prstatus.pr_reg.gpr[i] = cpu_to_dump64(s, env->gpr[i]);
+ }
+ note.prstatus.pr_reg.csr_era = cpu_to_dump64(s, env->CSR_ERA);
+ note.prstatus.pr_reg.csr_badv = cpu_to_dump64(s, env->CSR_BADV);
+ ret = f(¬e, LOONGARCH_PRSTATUS_NOTE_SIZE, s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ ret = loongarch_write_elf64_fprpreg(f, env, cpuid, s);
+ if (ret < 0) {
+ return -1;
+ }
+
+ return ret;
+}
+
+int cpu_get_dump_info(ArchDumpInfo *info,
+ const GuestPhysBlockList *guest_phys_blocks)
+{
+ info->d_machine = EM_LOONGARCH;
+ info->d_endian = ELFDATA2LSB;
+ info->d_class = ELFCLASS64;
+
+ return 0;
+}
+
+ssize_t cpu_get_note_size(int class, int machine, int nr_cpus)
+{
+ size_t note_size = 0;
+
+ if (class == ELFCLASS64) {
+ note_size = LOONGARCH_PRSTATUS_NOTE_SIZE + LOONGARCH_PRFPREG_NOTE_SIZE;
+ }
+
+ return note_size * nr_cpus;
+}
@@ -754,6 +754,7 @@ static const TCGCPUOps loongarch_tcg_ops = {
#include "hw/core/sysemu-cpu-ops.h"
static const struct SysemuCPUOps loongarch_sysemu_ops = {
+ .write_elf64_note = loongarch_cpu_write_elf64_note,
.get_phys_page_debug = loongarch_cpu_get_phys_page_debug,
};
@@ -72,5 +72,7 @@ void write_fcc(CPULoongArchState *env, uint64_t val);
int loongarch_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n);
int loongarch_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n);
void loongarch_cpu_register_gdb_regs_for_features(CPUState *cs);
+int loongarch_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
+ int cpuid, DumpState *s);
#endif
@@ -8,6 +8,7 @@ loongarch_ss.add(files(
loongarch_system_ss = ss.source_set()
loongarch_system_ss.add(files(
+ 'arch_dump.c',
'cpu_helper.c',
'loongarch-qmp-cmds.c',
'machine.c',
Add the support needed for creating prstatus elf notes. This allows us to use QMP dump-guest-memory. Now ELF notes of LoongArch only supports general elf notes, LSX and LASX is not supported, since it is mainly used to dump guest memory. Signed-off-by: Bibo Mao <maobibo@loongson.cn> --- target/loongarch/arch_dump.c | 167 +++++++++++++++++++++++++++++++++++ target/loongarch/cpu.c | 1 + target/loongarch/internals.h | 2 + target/loongarch/meson.build | 1 + 4 files changed, 171 insertions(+) create mode 100644 target/loongarch/arch_dump.c