#if defined(__linux__)
/* XXX Need to exclude __linux__ arches without perf_regs.h. */
-#if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__) || defined(__arm__)
+#if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__) || defined(__arm__) || defined(__powerpc__)
/* || defined(other_architecture)... */
# include <asm/perf_regs.h>
#endif
#define PERF_FRAME_REGISTERS_AARCH64 0
#endif /* _ASM_ARM64_PERF_REGS_H */
+#if defined(_UAPI_ASM_POWERPC_PERF_REGS_H)
+#define REG(R) (1ULL << PERF_REG_POWERPC_ ## R)
+/* TODO(REVIEW) The same register file is provided for 32-bit and
+ 64-bit powerpc architectures. Are the same registers needed for
+ unwinding? */
+#define PERF_FRAME_REGISTERS_POWERPC (REG(R1) | REG(R2) | REG(R3) | REG(R4) \
+ | REG(R5) | REG(R6) | REG(R7) | REG(R8) | REG(R9) | REG(R10) | REG(R11) \
+ | REG(R12) | REG(R13) | REG(R14) | REG(R15) | REG(R16) | REG(R17) \
+ | REG(R18) | REG(R19) | REG(R20) | REG(R21) | REG(R22) | REG(R23) \
+ | REG(R24) | REG(R25) | REG(R26) | REG(R27) | REG(R28) | REG(R29) \
+ | REG(R22) | REG(R23) | REG(R24) | REG(R25) | REG(R26) | REG(R27) \
+ | REG(R28) | REG(R29) | REG(R30) | REG(R31) | REG(NIP) | REG(LINK))
+/* Register ordering defined in linux arch/powerpc/include/uapi/asm/perf_regs.h. */
+#else
+/* Since asm/perf_regs.h is absent, or gives the register layout for a
+ different arch, we can't unwind powerpc perf sample frames. */
+#define PERF_FRAME_REGISTERS_POWERPC 0
+#endif /* _UAPI_ASM_POWERPC_PERF_REGS_H */
+
/* TODO(REVIEW) Replaces x86_sample_sp_pc -- is this header the right location for it? */
static inline bool
generic_sample_sp_pc (const Dwarf_Word *regs, uint32_t n_regs,
/* Initialization of PPC64 specific backend library.
- Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013, 2014 Red Hat, Inc.
+ Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013, 2014, 2026 Red Hat, Inc.
This file is part of elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2004.
#define BACKEND ppc64_
#define RELOC_PREFIX R_PPC64_
#include "libebl_CPU.h"
+#include "libebl_PERF_FLAGS.h"
/* This defines the common reloc hooks based on ppc64_reloc.def. */
#include "common-reloc.c"
/* gcc/config/ #define DWARF_FRAME_REGISTERS. */
eh->frame_nregs = (114 - 1) + 32;
HOOK (eh, set_initial_registers_tid);
+ HOOK (eh, set_initial_registers_sample);
+ HOOK (eh, sample_sp_pc);
+ HOOK (eh, sample_perf_regs_mapping);
+ eh->perf_frame_regs_mask = PERF_FRAME_REGISTERS_POWERPC;
+ __libebl_init_cached_regs_mapping(eh);
HOOK (eh, dwarf_to_regno);
HOOK (eh, unwind);
HOOK (eh, resolve_sym_value);
/* Initialization of PPC specific backend library.
- Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013 Red Hat, Inc.
+ Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013, 2026 Red Hat, Inc.
This file is part of elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2004.
#define BACKEND ppc_
#define RELOC_PREFIX R_PPC_
#include "libebl_CPU.h"
+#include "libebl_PERF_FLAGS.h"
/* This defines the common reloc hooks based on ppc_reloc.def. */
#include "common-reloc.c"
/* gcc/config/ #define DWARF_FRAME_REGISTERS. */
eh->frame_nregs = (114 - 1) + 32;
HOOK (eh, set_initial_registers_tid);
+ HOOK (eh, set_initial_registers_sample);
+ HOOK (eh, sample_sp_pc);
+ HOOK (eh, sample_perf_regs_mapping);
+ eh->perf_frame_regs_mask = PERF_FRAME_REGISTERS_POWERPC;
+ __libebl_init_cached_regs_mapping(eh);
HOOK (eh, dwarf_to_regno);
return eh;
--- /dev/null
+/* Populate process registers from a register sample.
+ Copyright (C) 2026 Red Hat, Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that 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 copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <assert.h>
+
+#define BACKEND ppc_
+#include "libebl_CPU.h"
+#include "libebl_PERF_FLAGS.h"
+
+/* LINK at dwarf_reg 65 from perf_reg 36 */
+#define LINK_DWARF 65
+#define LINK_PERF 36
+/* pc/NIP at dwarf_reg 64 from perf_reg 32 */
+#define NIP_DWARF 64
+#define NIP_PERF 32
+/* GPRS R0..R31 */
+#define GPRS 32
+
+
+bool
+ppc_sample_sp_pc (const Dwarf_Word *regs, uint32_t n_regs,
+ const int *regs_mapping, size_t n_regs_mapping,
+ Dwarf_Word *sp, Dwarf_Word *pc)
+{
+ return generic_sample_sp_pc (regs, n_regs, regs_mapping, n_regs_mapping,
+ sp, 1 /* index of sp/GPR1 in dwarf_regs */,
+ pc, 64 /* index of pc/NIP in dwarf_regs */);
+}
+
+bool
+ppc_set_initial_registers_sample (const Dwarf_Word *regs, uint32_t n_regs,
+ const int *regs_mapping, size_t n_regs_mapping,
+ ebl_tid_registers_t *setfunc,
+ void *arg)
+{
+/* TODO(REVIEW): The #ifdef here seems strictly optional as we don't
+ refer to perf_events or ptrace arch-specific declarations. */
+#if !defined(__powerpc__)
+ (void)regs; (void)n_regs;
+ (void)regs_mapping; (void)n_regs_mapping;
+ (void)setfunc; (void)arg;
+ return false;
+#else /* __powerpc__ */
+ Dwarf_Word link = 0x0;
+ Dwarf_Word pc = 0x0;
+ Dwarf_Word dwarf_regs[GPRS];
+ for (i = 0; i < GPRS; i++)
+ dwarf_regs[i] = 0x0;
+ for (i = 0; i < n_regs; i++)
+ {
+ if (i >= n_regs_mapping)
+ break;
+ if (regs_mapping[i] == LINK_DWARF)
+ link = regs[i];
+ if (regs_mapping[i] == NIP_DWARF)
+ pc = regs[i];
+ if (regs_mapping[i] < 0 || regs_mapping[i] >= GPRS)
+ continue;
+ dwarf_regs[regs_mapping[i]] = regs[i];
+ }
+
+ if (!setfunc (0, GPRS, dwarf_regs, arg))
+ return false;
+ if (!setfunc (65, 1, &link, arg))
+ return false;
+ return setfunc (-1, 1, &pc, arg);
+#endif
+}
+
+bool
+ppc_sample_perf_regs_mapping (Ebl *ebl,
+ uint64_t perf_regs_mask,
+ uint32_t abi __attribute__((unused)),
+ const int **regs_mapping,
+ size_t *n_regs_mapping)
+{
+#if !defined(__powerpc__)
+ (void)ebl; (void)perf_regs_mask;
+ (void)regs_mapping; (void)n_regs_mapping;
+ return false;
+#else /* __powerpc__ */
+ if (perf_regs_mask != 0 && ebl->cached_perf_regs_mask == perf_regs_mask)
+ {
+ *regs_mapping = ebl->cached_regs_mapping;
+ *n_regs_mapping = ebl->cached_n_regs_mapping;
+ return true;
+ }
+
+ /* Only slight remapping of perf_regs to dwarf_regs needed:
+ - GPRS 0..31 unchanged;
+ - PC 32 sent to dwarf_reg 64 (then to -1 when using setfunc);
+ - LC 36 sent to dwarf_reg 65.
+ - Other registers not used for unwinding cf ppc_initreg.c. */
+
+ /* Count bits and allocate regs_mapping: */
+ int j, k, kmax, count; uint64_t bit;
+ for (k = 0, kmax = -1, count = 0, bit = 1;
+ k < PERF_REG_POWERPC_MAX; k++, bit <<= 1)
+ {
+ if ((bit & perf_regs_mask)) {
+ count++;
+ kmax = k;
+ }
+ }
+ ebl->cached_perf_regs_mask = perf_regs_mask;
+ ebl->cached_regs_mapping = (int *)calloc (count, sizeof(int));
+ ebl->cached_n_regs_mapping = count;
+
+ /* Locations of perf_regs in the dwarf_regs array,
+ according to perf_regs_mask: */
+ for (j = 0, k = 0, bit = 1; k <= kmax; k++, bit <<= 1)
+ {
+ int i = -1;
+ if (!(bit & perf_regs_mask))
+ {
+ continue;
+ }
+ if (0 <= k && k < GPRS)
+ i = k;
+ else if (k == LINK_PERF)
+ i = LINK_DWARF;
+ else if (k == NIP_PERF)
+ i = NIP_DWARF;
+ ebl->cached_regs_mapping[j] = i;
+ j++;
+ }
+ for (; j < count; j++)
+ ebl->cached_regs_mapping[j] = -1;
+
+ *regs_mapping = ebl->cached_regs_mapping;
+ *n_regs_mapping = ebl->cached_n_regs_mapping;
+ return true;
+#endif /* __powerpc__ */
+}
+
+__typeof (ppc_sample_sp_pc)
+ ppc64_sample_sp_pc
+ __attribute__ ((alias ("ppc_sample_sp_pc")));
+
+__typeof (ppc_set_initial_registers_sample)
+ ppc64_set_initial_registers_sample
+ __attribute__ ((alias ("ppc_set_initial_registers_sample")));
+
+__typeof (ppc_sample_perf_regs_mapping)
+ ppc64_sample_perf_regs_mapping
+ __attribute__ ((alias ("ppc_sample_perf_regs_mapping")));
projects / thirdparty / elfutils.git / commitdiff
