11 files changed, 574 insertions, 0 deletions

diff --git a/tools/perf/arch/loongarch/Build b/tools/perf/arch/loongarch/Build
new file mode 100644
index 000000000000..e63eabc2c8f4
--- /dev/null
+++ b/tools/perf/arch/loongarch/Build
@@ -0,0 +1 @@
+perf-util-y += util/
diff --git a/tools/perf/arch/loongarch/Makefile b/tools/perf/arch/loongarch/Makefile
new file mode 100644
index 000000000000..087e099fb453
--- /dev/null
+++ b/tools/perf/arch/loongarch/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+PERF_HAVE_JITDUMP := 1
+HAVE_KVM_STAT_SUPPORT := 1
diff --git a/tools/perf/arch/loongarch/annotate/instructions.c b/tools/perf/arch/loongarch/annotate/instructions.c
new file mode 100644
index 000000000000..70262d5f1444
--- /dev/null
+++ b/tools/perf/arch/loongarch/annotate/instructions.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Perf annotate functions.
+ *
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+static int loongarch_call__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms,
+		struct disasm_line *dl __maybe_unused)
+{
+	char *c, *endptr, *tok, *name;
+	struct map *map = ms->map;
+	struct addr_map_symbol target = {
+		.ms = { .map = map, },
+	};
+
+	c = strchr(ops->raw, '#');
+	if (c++ == NULL)
+		return -1;
+
+	ops->target.addr = strtoull(c, &endptr, 16);
+
+	name = strchr(endptr, '<');
+	name++;
+
+	if (arch->objdump.skip_functions_char &&
+	    strchr(name, arch->objdump.skip_functions_char))
+		return -1;
+
+	tok = strchr(name, '>');
+	if (tok == NULL)
+		return -1;
+
+	*tok = '\0';
+	ops->target.name = strdup(name);
+	*tok = '>';
+
+	if (ops->target.name == NULL)
+		return -1;
+
+	target.addr = map__objdump_2mem(map, ops->target.addr);
+
+	if (maps__find_ams(ms->maps, &target) == 0 &&
+	    map__rip_2objdump(target.ms.map, map__map_ip(target.ms.map, target.addr)) == ops->target.addr)
+		ops->target.sym = target.ms.sym;
+
+	return 0;
+}
+
+static struct ins_ops loongarch_call_ops = {
+	.parse	   = loongarch_call__parse,
+	.scnprintf = call__scnprintf,
+};
+
+static int loongarch_jump__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms,
+		struct disasm_line *dl __maybe_unused)
+{
+	struct map *map = ms->map;
+	struct symbol *sym = ms->sym;
+	struct addr_map_symbol target = {
+		.ms = { .map = map, },
+	};
+	const char *c = strchr(ops->raw, '#');
+	u64 start, end;
+
+	ops->jump.raw_comment = strchr(ops->raw, arch->objdump.comment_char);
+	ops->jump.raw_func_start = strchr(ops->raw, '<');
+
+	if (ops->jump.raw_func_start && c > ops->jump.raw_func_start)
+		c = NULL;
+
+	if (c++ != NULL)
+		ops->target.addr = strtoull(c, NULL, 16);
+	else
+		ops->target.addr = strtoull(ops->raw, NULL, 16);
+
+	target.addr = map__objdump_2mem(map, ops->target.addr);
+	start = map__unmap_ip(map, sym->start);
+	end = map__unmap_ip(map, sym->end);
+
+	ops->target.outside = target.addr < start || target.addr > end;
+
+	if (maps__find_ams(ms->maps, &target) == 0 &&
+	    map__rip_2objdump(target.ms.map, map__map_ip(target.ms.map, target.addr)) == ops->target.addr)
+		ops->target.sym = target.ms.sym;
+
+	if (!ops->target.outside) {
+		ops->target.offset = target.addr - start;
+		ops->target.offset_avail = true;
+	} else {
+		ops->target.offset_avail = false;
+	}
+
+	return 0;
+}
+
+static struct ins_ops loongarch_jump_ops = {
+	.parse	   = loongarch_jump__parse,
+	.scnprintf = jump__scnprintf,
+};
+
+static
+struct ins_ops *loongarch__associate_ins_ops(struct arch *arch, const char *name)
+{
+	struct ins_ops *ops = NULL;
+
+	if (!strcmp(name, "bl"))
+		ops = &loongarch_call_ops;
+	else if (!strcmp(name, "jirl"))
+		ops = &ret_ops;
+	else if (!strcmp(name, "b") ||
+		 !strncmp(name, "beq", 3) ||
+		 !strncmp(name, "bne", 3) ||
+		 !strncmp(name, "blt", 3) ||
+		 !strncmp(name, "bge", 3) ||
+		 !strncmp(name, "bltu", 4) ||
+		 !strncmp(name, "bgeu", 4))
+		ops = &loongarch_jump_ops;
+	else
+		return NULL;
+
+	arch__associate_ins_ops(arch, name, ops);
+
+	return ops;
+}
+
+static
+int loongarch__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
+{
+	if (!arch->initialized) {
+		arch->associate_instruction_ops = loongarch__associate_ins_ops;
+		arch->initialized = true;
+		arch->objdump.comment_char = '#';
+		arch->e_machine = EM_LOONGARCH;
+		arch->e_flags = 0;
+	}
+
+	return 0;
+}
diff --git a/tools/perf/arch/loongarch/include/dwarf-regs-table.h b/tools/perf/arch/loongarch/include/dwarf-regs-table.h
new file mode 100644
index 000000000000..bb3944f5764a
--- /dev/null
+++ b/tools/perf/arch/loongarch/include/dwarf-regs-table.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * dwarf-regs-table.h : Mapping of DWARF debug register numbers into
+ * register names.
+ *
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#ifdef DEFINE_DWARF_REGSTR_TABLE
+static const char * const loongarch_regstr_tbl[] = {
+	"%r0", "%r1", "%r2", "%r3", "%r4", "%r5", "%r6", "%r7",
+	"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15",
+	"%r16", "%r17", "%r18", "%r19", "%r20", "%r21", "%r22", "%r23",
+	"%r24", "%r25", "%r26", "%r27", "%r28", "%r29", "%r30", "%r31",
+};
+#endif
diff --git a/tools/perf/arch/loongarch/include/perf_regs.h b/tools/perf/arch/loongarch/include/perf_regs.h
new file mode 100644
index 000000000000..45c799fa5330
--- /dev/null
+++ b/tools/perf/arch/loongarch/include/perf_regs.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ARCH_PERF_REGS_H
+#define ARCH_PERF_REGS_H
+
+#include <stdlib.h>
+#include <linux/types.h>
+#include <asm/perf_regs.h>
+
+#define PERF_REGS_MAX PERF_REG_LOONGARCH_MAX
+
+#define PERF_REGS_MASK ((1ULL << PERF_REG_LOONGARCH_MAX) - 1)
+
+#endif /* ARCH_PERF_REGS_H */
diff --git a/tools/perf/arch/loongarch/util/Build b/tools/perf/arch/loongarch/util/Build
new file mode 100644
index 000000000000..0aa31986ecb5
--- /dev/null
+++ b/tools/perf/arch/loongarch/util/Build
@@ -0,0 +1,6 @@
+perf-util-y += header.o
+perf-util-y += perf_regs.o
+
+perf-util-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
+perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
+perf-util-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o
diff --git a/tools/perf/arch/loongarch/util/header.c b/tools/perf/arch/loongarch/util/header.c
new file mode 100644
index 000000000000..0c6d823334a2
--- /dev/null
+++ b/tools/perf/arch/loongarch/util/header.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Implementation of get_cpuid().
+ *
+ * Author: Nikita Shubin <n.shubin@yadro.com>
+ *         Bibo Mao <maobibo@loongson.cn>
+ *         Huacai Chen <chenhuacai@loongson.cn>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <api/fs/fs.h>
+#include <errno.h>
+#include "util/debug.h"
+#include "util/header.h"
+
+/*
+ * Output example from /proc/cpuinfo
+ *   CPU Family              : Loongson-64bit
+ *   Model Name              : Loongson-3C5000
+ *   CPU Revision            : 0x10
+ *   FPU Revision            : 0x01
+ */
+#define CPUINFO_MODEL	"Model Name"
+#define CPUINFO		"/proc/cpuinfo"
+
+static char *_get_field(const char *line)
+{
+	char *line2, *nl;
+
+	line2 = strrchr(line, ' ');
+	if (!line2)
+		return NULL;
+
+	line2++;
+	nl = strrchr(line, '\n');
+	if (!nl)
+		return NULL;
+
+	return strndup(line2, nl - line2);
+}
+
+static char *_get_cpuid(void)
+{
+	unsigned long line_sz;
+	char *line, *model, *cpuid;
+	FILE *file;
+
+	file = fopen(CPUINFO, "r");
+	if (file == NULL)
+		return NULL;
+
+	line = model = cpuid = NULL;
+	while (getline(&line, &line_sz, file) != -1) {
+		if (strncmp(line, CPUINFO_MODEL, strlen(CPUINFO_MODEL)))
+			continue;
+
+		model = _get_field(line);
+		if (!model)
+			goto out_free;
+		break;
+	}
+
+	if (model && (asprintf(&cpuid, "%s", model) < 0))
+		cpuid = NULL;
+
+out_free:
+	fclose(file);
+	free(model);
+	return cpuid;
+}
+
+int get_cpuid(char *buffer, size_t sz, struct perf_cpu cpu __maybe_unused)
+{
+	int ret = 0;
+	char *cpuid = _get_cpuid();
+
+	if (!cpuid)
+		return EINVAL;
+
+	if (sz < strlen(cpuid)) {
+		ret = ENOBUFS;
+		goto out_free;
+	}
+
+	scnprintf(buffer, sz, "%s", cpuid);
+
+out_free:
+	free(cpuid);
+	return ret;
+}
+
+char *get_cpuid_str(struct perf_cpu cpu __maybe_unused)
+{
+	return _get_cpuid();
+}
diff --git a/tools/perf/arch/loongarch/util/kvm-stat.c b/tools/perf/arch/loongarch/util/kvm-stat.c
new file mode 100644
index 000000000000..a7859a3a9a51
--- /dev/null
+++ b/tools/perf/arch/loongarch/util/kvm-stat.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <memory.h>
+#include "util/kvm-stat.h"
+#include "util/parse-events.h"
+#include "util/debug.h"
+#include "util/evsel.h"
+#include "util/evlist.h"
+#include "util/pmus.h"
+
+#define LOONGARCH_EXCEPTION_INT		0
+#define LOONGARCH_EXCEPTION_PIL		1
+#define LOONGARCH_EXCEPTION_PIS		2
+#define LOONGARCH_EXCEPTION_PIF		3
+#define LOONGARCH_EXCEPTION_PME		4
+#define LOONGARCH_EXCEPTION_FPD		15
+#define LOONGARCH_EXCEPTION_SXD		16
+#define LOONGARCH_EXCEPTION_ASXD	17
+#define LOONGARCH_EXCEPTION_GSPR	22
+#define  LOONGARCH_EXCEPTION_CPUCFG	100
+#define  LOONGARCH_EXCEPTION_CSR	101
+#define  LOONGARCH_EXCEPTION_IOCSR	102
+#define  LOONGARCH_EXCEPTION_IDLE	103
+#define  LOONGARCH_EXCEPTION_OTHERS	104
+#define LOONGARCH_EXCEPTION_HVC		23
+
+#define loongarch_exception_type				\
+	{LOONGARCH_EXCEPTION_INT,  "Interrupt" },		\
+	{LOONGARCH_EXCEPTION_PIL,  "Mem Read" },		\
+	{LOONGARCH_EXCEPTION_PIS,  "Mem Store" },		\
+	{LOONGARCH_EXCEPTION_PIF,  "Inst Fetch" },		\
+	{LOONGARCH_EXCEPTION_PME,  "Mem Modify" },		\
+	{LOONGARCH_EXCEPTION_FPD,  "FPU" },			\
+	{LOONGARCH_EXCEPTION_SXD,  "LSX" },			\
+	{LOONGARCH_EXCEPTION_ASXD, "LASX" },			\
+	{LOONGARCH_EXCEPTION_GSPR, "Privilege Error" },		\
+	{LOONGARCH_EXCEPTION_HVC,  "Hypercall" },		\
+	{LOONGARCH_EXCEPTION_CPUCFG, "CPUCFG" },		\
+	{LOONGARCH_EXCEPTION_CSR,    "CSR" },			\
+	{LOONGARCH_EXCEPTION_IOCSR,  "IOCSR" },			\
+	{LOONGARCH_EXCEPTION_IDLE,   "Idle" },			\
+	{LOONGARCH_EXCEPTION_OTHERS, "Others" }
+
+define_exit_reasons_table(loongarch_exit_reasons, loongarch_exception_type);
+
+const char *vcpu_id_str = "vcpu_id";
+const char *kvm_exit_reason = "reason";
+const char *kvm_entry_trace = "kvm:kvm_enter";
+const char *kvm_reenter_trace = "kvm:kvm_reenter";
+const char *kvm_exit_trace = "kvm:kvm_exit";
+const char *kvm_events_tp[] = {
+	"kvm:kvm_enter",
+	"kvm:kvm_reenter",
+	"kvm:kvm_exit",
+	"kvm:kvm_exit_gspr",
+	NULL,
+};
+
+static bool event_begin(struct evsel *evsel,
+			struct perf_sample *sample, struct event_key *key)
+{
+	return exit_event_begin(evsel, sample, key);
+}
+
+static bool event_end(struct evsel *evsel,
+		      struct perf_sample *sample __maybe_unused,
+		      struct event_key *key __maybe_unused)
+{
+	/*
+	 * LoongArch kvm is different with other architectures
+	 *
+	 * There is kvm:kvm_reenter or kvm:kvm_enter event adjacent with
+	 * kvm:kvm_exit event.
+	 *   kvm:kvm_enter   means returning to vmm and then to guest
+	 *   kvm:kvm_reenter means returning to guest immediately
+	 */
+	return evsel__name_is(evsel, kvm_entry_trace) || evsel__name_is(evsel, kvm_reenter_trace);
+}
+
+static void event_gspr_get_key(struct evsel *evsel,
+			       struct perf_sample *sample, struct event_key *key)
+{
+	unsigned int insn;
+
+	key->key = LOONGARCH_EXCEPTION_OTHERS;
+	insn = evsel__intval(evsel, sample, "inst_word");
+
+	switch (insn >> 24) {
+	case 0:
+		/* CPUCFG inst trap */
+		if ((insn >> 10) == 0x1b)
+			key->key = LOONGARCH_EXCEPTION_CPUCFG;
+		break;
+	case 4:
+		/* CSR inst trap */
+		key->key = LOONGARCH_EXCEPTION_CSR;
+		break;
+	case 6:
+		/* IOCSR inst trap */
+		if ((insn >> 15) == 0xc90)
+			key->key = LOONGARCH_EXCEPTION_IOCSR;
+		else if ((insn >> 15) == 0xc91)
+			/* Idle inst trap */
+			key->key = LOONGARCH_EXCEPTION_IDLE;
+		break;
+	default:
+		key->key = LOONGARCH_EXCEPTION_OTHERS;
+		break;
+	}
+}
+
+static struct child_event_ops child_events[] = {
+	{ .name = "kvm:kvm_exit_gspr", .get_key = event_gspr_get_key },
+	{ NULL, NULL },
+};
+
+static struct kvm_events_ops exit_events = {
+	.is_begin_event = event_begin,
+	.is_end_event = event_end,
+	.child_ops = child_events,
+	.decode_key = exit_event_decode_key,
+	.name = "VM-EXIT"
+};
+
+struct kvm_reg_events_ops kvm_reg_events_ops[] = {
+	{ .name	= "vmexit", .ops = &exit_events, },
+	{ NULL, NULL },
+};
+
+const char * const kvm_skip_events[] = {
+	NULL,
+};
+
+int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
+{
+	kvm->exit_reasons_isa = "loongarch64";
+	kvm->exit_reasons = loongarch_exit_reasons;
+	return 0;
+}
diff --git a/tools/perf/arch/loongarch/util/perf_regs.c b/tools/perf/arch/loongarch/util/perf_regs.c
new file mode 100644
index 000000000000..f94a0210c7b7
--- /dev/null
+++ b/tools/perf/arch/loongarch/util/perf_regs.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "perf_regs.h"
+#include "../../../util/perf_regs.h"
+
+static const struct sample_reg sample_reg_masks[] = {
+	SMPL_REG_END
+};
+
+uint64_t arch__intr_reg_mask(void)
+{
+	return PERF_REGS_MASK;
+}
+
+uint64_t arch__user_reg_mask(void)
+{
+	return PERF_REGS_MASK;
+}
+
+const struct sample_reg *arch__sample_reg_masks(void)
+{
+	return sample_reg_masks;
+}
diff --git a/tools/perf/arch/loongarch/util/unwind-libdw.c b/tools/perf/arch/loongarch/util/unwind-libdw.c
new file mode 100644
index 000000000000..60b1144bedd5
--- /dev/null
+++ b/tools/perf/arch/loongarch/util/unwind-libdw.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2020-2023 Loongson Technology Corporation Limited */
+
+#include <elfutils/libdwfl.h>
+#include "perf_regs.h"
+#include "../../util/unwind-libdw.h"
+#include "../../util/perf_regs.h"
+#include "../../util/sample.h"
+
+bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
+{
+	struct unwind_info *ui = arg;
+	struct regs_dump *user_regs = perf_sample__user_regs(ui->sample);
+	Dwarf_Word dwarf_regs[PERF_REG_LOONGARCH_MAX];
+
+#define REG(r) ({							\
+	Dwarf_Word val = 0;						\
+	perf_reg_value(&val, user_regs, PERF_REG_LOONGARCH_##r);	\
+	val;								\
+})
+
+	dwarf_regs[0]  = 0;
+	dwarf_regs[1]  = REG(R1);
+	dwarf_regs[2]  = REG(R2);
+	dwarf_regs[3]  = REG(R3);
+	dwarf_regs[4]  = REG(R4);
+	dwarf_regs[5]  = REG(R5);
+	dwarf_regs[6]  = REG(R6);
+	dwarf_regs[7]  = REG(R7);
+	dwarf_regs[8]  = REG(R8);
+	dwarf_regs[9]  = REG(R9);
+	dwarf_regs[10] = REG(R10);
+	dwarf_regs[11] = REG(R11);
+	dwarf_regs[12] = REG(R12);
+	dwarf_regs[13] = REG(R13);
+	dwarf_regs[14] = REG(R14);
+	dwarf_regs[15] = REG(R15);
+	dwarf_regs[16] = REG(R16);
+	dwarf_regs[17] = REG(R17);
+	dwarf_regs[18] = REG(R18);
+	dwarf_regs[19] = REG(R19);
+	dwarf_regs[20] = REG(R20);
+	dwarf_regs[21] = REG(R21);
+	dwarf_regs[22] = REG(R22);
+	dwarf_regs[23] = REG(R23);
+	dwarf_regs[24] = REG(R24);
+	dwarf_regs[25] = REG(R25);
+	dwarf_regs[26] = REG(R26);
+	dwarf_regs[27] = REG(R27);
+	dwarf_regs[28] = REG(R28);
+	dwarf_regs[29] = REG(R29);
+	dwarf_regs[30] = REG(R30);
+	dwarf_regs[31] = REG(R31);
+	dwfl_thread_state_register_pc(thread, REG(PC));
+
+	return dwfl_thread_state_registers(thread, 0, PERF_REG_LOONGARCH_MAX, dwarf_regs);
+}
diff --git a/tools/perf/arch/loongarch/util/unwind-libunwind.c b/tools/perf/arch/loongarch/util/unwind-libunwind.c
new file mode 100644
index 000000000000..f693167b86ef
--- /dev/null
+++ b/tools/perf/arch/loongarch/util/unwind-libunwind.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <errno.h>
+#include <libunwind.h>
+#include "perf_regs.h"
+#include "../../util/unwind.h"
+#include "util/debug.h"
+
+int libunwind__arch_reg_id(int regnum)
+{
+	switch (regnum) {
+	case UNW_LOONGARCH64_R1:
+		return PERF_REG_LOONGARCH_R1;
+	case UNW_LOONGARCH64_R2:
+		return PERF_REG_LOONGARCH_R2;
+	case UNW_LOONGARCH64_R3:
+		return PERF_REG_LOONGARCH_R3;
+	case UNW_LOONGARCH64_R4:
+		return PERF_REG_LOONGARCH_R4;
+	case UNW_LOONGARCH64_R5:
+		return PERF_REG_LOONGARCH_R5;
+	case UNW_LOONGARCH64_R6:
+		return PERF_REG_LOONGARCH_R6;
+	case UNW_LOONGARCH64_R7:
+		return PERF_REG_LOONGARCH_R7;
+	case UNW_LOONGARCH64_R8:
+		return PERF_REG_LOONGARCH_R8;
+	case UNW_LOONGARCH64_R9:
+		return PERF_REG_LOONGARCH_R9;
+	case UNW_LOONGARCH64_R10:
+		return PERF_REG_LOONGARCH_R10;
+	case UNW_LOONGARCH64_R11:
+		return PERF_REG_LOONGARCH_R11;
+	case UNW_LOONGARCH64_R12:
+		return PERF_REG_LOONGARCH_R12;
+	case UNW_LOONGARCH64_R13:
+		return PERF_REG_LOONGARCH_R13;
+	case UNW_LOONGARCH64_R14:
+		return PERF_REG_LOONGARCH_R14;
+	case UNW_LOONGARCH64_R15:
+		return PERF_REG_LOONGARCH_R15;
+	case UNW_LOONGARCH64_R16:
+		return PERF_REG_LOONGARCH_R16;
+	case UNW_LOONGARCH64_R17:
+		return PERF_REG_LOONGARCH_R17;
+	case UNW_LOONGARCH64_R18:
+		return PERF_REG_LOONGARCH_R18;
+	case UNW_LOONGARCH64_R19:
+		return PERF_REG_LOONGARCH_R19;
+	case UNW_LOONGARCH64_R20:
+		return PERF_REG_LOONGARCH_R20;
+	case UNW_LOONGARCH64_R21:
+		return PERF_REG_LOONGARCH_R21;
+	case UNW_LOONGARCH64_R22:
+		return PERF_REG_LOONGARCH_R22;
+	case UNW_LOONGARCH64_R23:
+		return PERF_REG_LOONGARCH_R23;
+	case UNW_LOONGARCH64_R24:
+		return PERF_REG_LOONGARCH_R24;
+	case UNW_LOONGARCH64_R25:
+		return PERF_REG_LOONGARCH_R25;
+	case UNW_LOONGARCH64_R26:
+		return PERF_REG_LOONGARCH_R26;
+	case UNW_LOONGARCH64_R27:
+		return PERF_REG_LOONGARCH_R27;
+	case UNW_LOONGARCH64_R28:
+		return PERF_REG_LOONGARCH_R28;
+	case UNW_LOONGARCH64_R29:
+		return PERF_REG_LOONGARCH_R29;
+	case UNW_LOONGARCH64_R30:
+		return PERF_REG_LOONGARCH_R30;
+	case UNW_LOONGARCH64_R31:
+		return PERF_REG_LOONGARCH_R31;
+	case UNW_LOONGARCH64_PC:
+		return PERF_REG_LOONGARCH_PC;
+	default:
+		pr_err("unwind: invalid reg id %d\n", regnum);
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}