// SPDX-License-Identifier: GPL-2.0
#include "cpumap.h"
+#include "dwarf-regs.h"
#include "debug.h"
#include "env.h"
#include "util/header.h"
#include "util/rwsem.h"
#include <linux/compiler.h>
+#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/rbtree.h>
#include <linux/string.h>
static void perf_env__init_kernel_mode(struct perf_env *env)
{
- const char *arch = perf_env__raw_arch(env);
+ const char *arch = env->arch;
- if (!strncmp(arch, "x86_64", 6) || !strncmp(arch, "aarch64", 7) ||
- !strncmp(arch, "arm64", 5) || !strncmp(arch, "mips64", 6) ||
- !strncmp(arch, "parisc64", 8) || !strncmp(arch, "riscv64", 7) ||
- !strncmp(arch, "s390x", 5) || !strncmp(arch, "sparc64", 7))
- env->kernel_is_64_bit = 1;
- else
- env->kernel_is_64_bit = 0;
+ if (!arch) {
+ static struct utsname uts = { .machine[0] = '\0', };
+
+ if (uts.machine[0] == '\0')
+ uname(&uts);
+ if (uts.machine[0] != '\0')
+ arch = uts.machine;
+ }
+
+ if (arch) {
+ if (strstr(arch, "64") || strstr(arch, "s390x"))
+ env->kernel_is_64_bit = 1;
+ else
+ env->kernel_is_64_bit = 0;
+ return;
+ }
+
+ /* Fallback if completely unresolvable (assume host-bitness) */
+ env->kernel_is_64_bit = (sizeof(void *) == 8) ? 1 : 0;
}
int perf_env__kernel_is_64_bit(struct perf_env *env)
zfree(&cache->size);
}
+struct arch_to_e_machine {
+ const char *prefix;
+ uint16_t e_machine;
+};
+
/*
- * Return architecture name in a normalized form.
- * The conversion logic comes from the Makefile.
+ * A mapping from an arch prefix string to an ELF machine that can be used in a
+ * bsearch. Some arch prefixes are shared an need additional processing as
+ * marked next to the architecture. The prefixes handle both perf's architecture
+ * naming and those from uname.
*/
-static const char *normalize_arch(char *arch)
-{
- if (!strcmp(arch, "x86_64"))
- return "x86";
- if (arch[0] == 'i' && arch[2] == '8' && arch[3] == '6')
- return "x86";
- if (!strcmp(arch, "sun4u") || !strncmp(arch, "sparc", 5))
- return "sparc";
- if (!strncmp(arch, "aarch64", 7) || !strncmp(arch, "arm64", 5))
- return "arm64";
- if (!strncmp(arch, "arm", 3) || !strcmp(arch, "sa110"))
- return "arm";
- if (!strncmp(arch, "s390", 4))
- return "s390";
- if (!strncmp(arch, "parisc", 6))
- return "parisc";
- if (!strncmp(arch, "powerpc", 7) || !strncmp(arch, "ppc", 3))
- return "powerpc";
- if (!strncmp(arch, "mips", 4))
- return "mips";
- if (!strncmp(arch, "sh", 2) && isdigit(arch[2]))
- return "sh";
- if (!strncmp(arch, "loongarch", 9))
- return "loongarch";
+static const struct arch_to_e_machine prefix_to_e_machine[] = {
+ {"aarch64", EM_AARCH64},
+ {"alpha", EM_ALPHA},
+ {"arc", EM_ARC},
+ {"arm", EM_ARM}, /* Check also for EM_AARCH64. */
+ {"avr", EM_AVR}, /* Check also for EM_AVR32. */
+ {"bfin", EM_BLACKFIN},
+ {"blackfin", EM_BLACKFIN},
+ {"cris", EM_CRIS},
+ {"csky", EM_CSKY},
+ {"hppa", EM_PARISC},
+ {"i386", EM_386},
+ {"i486", EM_386},
+ {"i586", EM_386},
+ {"i686", EM_386},
+ {"loongarch", EM_LOONGARCH},
+ {"m32r", EM_M32R},
+ {"m68k", EM_68K},
+ {"microblaze", EM_MICROBLAZE},
+ {"mips", EM_MIPS},
+ {"msp430", EM_MSP430},
+ {"parisc", EM_PARISC},
+ {"powerpc", EM_PPC}, /* Check also for EM_PPC64. */
+ {"ppc", EM_PPC}, /* Check also for EM_PPC64. */
+ {"riscv", EM_RISCV},
+ {"s390", EM_S390},
+ {"sa110", EM_ARM},
+ {"sh", EM_SH},
+ {"sparc", EM_SPARC}, /* Check also for EM_SPARCV9. */
+ {"sun4u", EM_SPARC},
+ {"x86", EM_X86_64}, /* Check also for EM_386. */
+ {"xtensa", EM_XTENSA},
+};
+
+static int compare_prefix(const void *key, const void *element)
+{
+ const char *search_key = key;
+ const struct arch_to_e_machine *map_element = element;
+ size_t prefix_len = strlen(map_element->prefix);
- return arch;
+ return strncmp(search_key, map_element->prefix, prefix_len);
+}
+
+static uint16_t perf_arch_to_e_machine(const char *perf_arch, int is_64_bit)
+{
+ /* Binary search for a matching prefix. */
+ const struct arch_to_e_machine *result;
+
+ if (!perf_arch)
+ return EM_HOST;
+
+ result = bsearch(perf_arch,
+ prefix_to_e_machine, ARRAY_SIZE(prefix_to_e_machine),
+ sizeof(prefix_to_e_machine[0]),
+ compare_prefix);
+
+ if (!result) {
+ pr_debug("Unknown perf arch for ELF machine mapping: %s\n", perf_arch);
+ return EM_NONE;
+ }
+
+ /*
+ * Handle conflicting prefixes. If the is_64_bit is unknown (-1) then
+ * assume 64-bit. We can't use perf_env__kernel_is_64_bit as that
+ * depends on the arch string.
+ */
+ switch (result->e_machine) {
+ case EM_ARM:
+ return !strcmp(perf_arch, "arm64") || !strcmp(perf_arch, "aarch64")
+ ? EM_AARCH64 : EM_ARM;
+ case EM_AVR:
+ return !strcmp(perf_arch, "avr32") ? EM_AVR32 : EM_AVR;
+ case EM_PPC:
+ if (is_64_bit == 1)
+ return EM_PPC64;
+ if (is_64_bit == 0)
+ return EM_PPC;
+ return strstarts(perf_arch, "ppc64") ? EM_PPC64 : EM_PPC;
+ case EM_SPARC:
+ if (is_64_bit == 1)
+ return EM_SPARCV9;
+ if (is_64_bit == 0)
+ return EM_SPARC;
+ return !strcmp(perf_arch, "sparc64") || !strcmp(perf_arch, "sun4u")
+ ? EM_SPARCV9 : EM_SPARC;
+ case EM_X86_64:
+ if (is_64_bit == 1)
+ return EM_X86_64;
+ if (is_64_bit == 0)
+ return EM_386;
+ return !strcmp(perf_arch, "x86_64") || !strcmp(perf_arch, "x86")
+ ? EM_X86_64 : EM_386;
+ default:
+ return result->e_machine;
+ }
+}
+
+static const char *e_machine_to_perf_arch(uint16_t e_machine)
+{
+ /*
+ * Table for if either the perf arch string differs from uname or there
+ * are >1 ELF machine with the prefix.
+ */
+ static const struct arch_to_e_machine extras[] = {
+ {"arm64", EM_AARCH64},
+ {"avr32", EM_AVR32},
+ {"powerpc", EM_PPC},
+ {"powerpc", EM_PPC64},
+ {"sparc", EM_SPARCV9},
+ {"x86", EM_386},
+ {"x86", EM_X86_64},
+ {"none", EM_NONE},
+ };
+
+ for (size_t i = 0; i < ARRAY_SIZE(extras); i++) {
+ if (extras[i].e_machine == e_machine)
+ return extras[i].prefix;
+ }
+
+ for (size_t i = 0; i < ARRAY_SIZE(prefix_to_e_machine); i++) {
+ if (prefix_to_e_machine[i].e_machine == e_machine)
+ return prefix_to_e_machine[i].prefix;
+
+ }
+ return "unknown";
+}
+
+uint16_t perf_env__e_machine_nocache(struct perf_env *env, uint32_t *e_flags)
+{
+ uint16_t e_machine = EM_NONE;
+ const char *arch = NULL;
+ int is_64_bit = -1;
+
+ if (e_flags)
+ *e_flags = 0;
+
+ if (env) {
+ arch = env->arch;
+ is_64_bit = env->kernel_is_64_bit;
+ }
+
+ if (!arch) {
+ static struct utsname uts = { .machine[0] = '\0', };
+
+ if (uts.machine[0] == '\0')
+ uname(&uts);
+ if (uts.machine[0] != '\0')
+ arch = uts.machine;
+ }
+
+ e_machine = perf_arch_to_e_machine(arch, is_64_bit);
+
+ if (e_flags)
+ *e_flags = (e_machine == EM_HOST) ? EF_HOST : 0;
+
+ return e_machine;
+}
+
+uint16_t perf_env__e_machine(struct perf_env *env, uint32_t *e_flags)
+{
+ uint16_t e_machine;
+ uint32_t local_e_flags = 0;
+
+ if (env && env->e_machine != EM_NONE) {
+ if (e_flags)
+ *e_flags = env->e_flags;
+
+ return env->e_machine;
+ }
+ e_machine = perf_env__e_machine_nocache(env, &local_e_flags);
+ /*
+ * Only cache the e_machine in perf_env if env->arch is not NULL.
+ * If env->arch is NULL, the e_machine is just a fallback to EM_HOST.
+ * Caching it permanently would prevent dynamic, more accurate
+ * thread-based session e_machine scanning later in
+ * perf_session__e_machine().
+ */
+ if (env && env->arch) {
+ env->e_machine = e_machine;
+ env->e_flags = local_e_flags;
+ }
+ if (e_flags)
+ *e_flags = local_e_flags;
+
+ return e_machine;
}
const char *perf_env__arch(struct perf_env *env)
{
- char *arch_name;
+ uint16_t e_machine;
+ const char *arch;
- if (!env || !env->arch) { /* Assume local operation */
+ if (!env) {
static struct utsname uts = { .machine[0] = '\0', };
- if (uts.machine[0] == '\0' && uname(&uts) < 0)
- return NULL;
- arch_name = uts.machine;
- } else
- arch_name = env->arch;
+ uint16_t host_e_machine;
- return normalize_arch(arch_name);
+ if (uts.machine[0] == '\0')
+ uname(&uts);
+ if (uts.machine[0] != '\0') {
+ host_e_machine = perf_arch_to_e_machine(uts.machine, -1);
+ return e_machine_to_perf_arch(host_e_machine);
+ }
+ return e_machine_to_perf_arch(EM_HOST);
+ }
+
+ /*
+ * Lazily compute/allocate arch. The e_machine may have been
+ * read from a data file and so may not be EM_HOST.
+ */
+ e_machine = perf_env__e_machine(env, /*e_flags=*/NULL);
+ arch = e_machine_to_perf_arch(e_machine);
+
+ if (e_machine == EM_RISCV && perf_env__kernel_is_64_bit(env) == 1)
+ arch = "riscv64";
+ else if (e_machine == EM_MIPS && perf_env__kernel_is_64_bit(env) == 1)
+ arch = "mips64";
+ else if (e_machine == EM_PARISC && perf_env__kernel_is_64_bit(env) == 1)
+ arch = "parisc64";
+
+ return arch;
}
const char *perf_env__arch_strerrno(struct perf_env *env __maybe_unused, int err __maybe_unused)
projects / thirdparty / kernel / linux.git / commitdiff
