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/*
* 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);
note.fpu.fcc = cpu_to_dump64(s, read_fcc(env));
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;
}
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