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authorGravatar Max Filippov <jcmvbkbc@gmail.com>2015-03-17 23:26:01 +0300
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2015-03-17 21:33:52 +0100
commitef804af14e8fed9567ddbe428342da4c57b7032d (patch)
tree55c8d6620e606671d681c6339e5e823e4fbc3a9f /package/ltrace
parent48634552d6cadc42added9e740c2608885df2a5e (diff)
downloadbuildroot-ef804af14e8fed9567ddbe428342da4c57b7032d.tar.gz
buildroot-ef804af14e8fed9567ddbe428342da4c57b7032d.tar.bz2
package/ltrace: add support for xtensa
Backported from: 05143c95e4609e5592775fae5facbf77b7bfa694 Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'package/ltrace')
-rw-r--r--package/ltrace/0004-xtensa-add-xtensa-support.patch1612
-rw-r--r--package/ltrace/Config.in2
2 files changed, 1613 insertions, 1 deletions
diff --git a/package/ltrace/0004-xtensa-add-xtensa-support.patch b/package/ltrace/0004-xtensa-add-xtensa-support.patch
new file mode 100644
index 0000000000..798a230cfc
--- /dev/null
+++ b/package/ltrace/0004-xtensa-add-xtensa-support.patch
@@ -0,0 +1,1612 @@
+From 05ee6bd2986c62d611ff9dfe6dbf11d2def0844b Mon Sep 17 00:00:00 2001
+From: Max Filippov <jcmvbkbc@gmail.com>
+Date: Sun, 4 Jan 2015 06:57:41 +0300
+Subject: [PATCH] xtensa: add xtensa support
+
+Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
+---
+ CREDITS | 4 +
+ NEWS | 1 +
+ README | 1 +
+ configure.ac | 2 +
+ sysdeps/linux-gnu/Makefile.am | 2 +-
+ sysdeps/linux-gnu/xtensa/Makefile.am | 36 +++
+ sysdeps/linux-gnu/xtensa/arch.h | 111 ++++++++
+ sysdeps/linux-gnu/xtensa/breakpoint.c | 71 ++++++
+ sysdeps/linux-gnu/xtensa/fetch.c | 188 ++++++++++++++
+ sysdeps/linux-gnu/xtensa/plt.c | 463 ++++++++++++++++++++++++++++++++++
+ sysdeps/linux-gnu/xtensa/ptrace.h | 21 ++
+ sysdeps/linux-gnu/xtensa/regs.c | 83 ++++++
+ sysdeps/linux-gnu/xtensa/signalent.h | 52 ++++
+ sysdeps/linux-gnu/xtensa/syscallent.h | 357 ++++++++++++++++++++++++++
+ sysdeps/linux-gnu/xtensa/trace.c | 61 +++++
+ 15 files changed, 1452 insertions(+), 1 deletion(-)
+ create mode 100644 sysdeps/linux-gnu/xtensa/Makefile.am
+ create mode 100644 sysdeps/linux-gnu/xtensa/arch.h
+ create mode 100644 sysdeps/linux-gnu/xtensa/breakpoint.c
+ create mode 100644 sysdeps/linux-gnu/xtensa/fetch.c
+ create mode 100644 sysdeps/linux-gnu/xtensa/plt.c
+ create mode 100644 sysdeps/linux-gnu/xtensa/ptrace.h
+ create mode 100644 sysdeps/linux-gnu/xtensa/regs.c
+ create mode 100644 sysdeps/linux-gnu/xtensa/signalent.h
+ create mode 100644 sysdeps/linux-gnu/xtensa/syscallent.h
+ create mode 100644 sysdeps/linux-gnu/xtensa/trace.c
+
+diff --git a/CREDITS b/CREDITS
+index c85eb76..67f1761 100644
+--- a/CREDITS
++++ b/CREDITS
+@@ -61,6 +61,10 @@ N: Timothy Fesig
+ E: slate@us.ibm.com
+ D: s390 port
+
++N: Max Filippov
++E: jcmvbkbc@gmail.com
++D: xtensa port
++
+ N: Roman Hodek
+ E: Roman.Hodek@informatik.uni-erlangen.de
+ D: m68k port
+diff --git a/NEWS b/NEWS
+index 71d3a1f..a8e83f1 100644
+--- a/NEWS
++++ b/NEWS
+@@ -38,6 +38,7 @@
+ binaries, as currently there's no 32-bit userspace available for
+ ARM64 processors.
+ - Imagination Technologies Meta is now supported.
++ - Cadence Tensilica Xtensa is now supported.
+
+ - On Linux, tracing of IFUNC symbols is supported. On i386,
+ x86_64, ppc32 with secure PLT and ppc64, IRELATIVE PLT slots are
+diff --git a/README b/README
+index a04b767..a38e8dc 100644
+--- a/README
++++ b/README
+@@ -37,6 +37,7 @@ to test each release comprehensively on each target.
+ s390-*-linux-gnu
+ s390x-*-linux-gnu
+ x86_64-*-linux-gnu
++ xtensa-*-linux-gnu
+
+ The following systems were supported at some point in past, but
+ current status is unknown:
+diff --git a/configure.ac b/configure.ac
+index 4f360c8..55c5c84 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -47,6 +47,7 @@ case "${host_cpu}" in
+ sun4u|sparc64) HOST_CPU="sparc" ;;
+ s390x) HOST_CPU="s390" ;;
+ i?86|x86_64) HOST_CPU="x86" ;;
++ xtensa*) HOST_CPU="xtensa" ;;
+ *) HOST_CPU="${host_cpu}" ;;
+ esac
+ AC_SUBST(HOST_CPU)
+@@ -412,6 +413,7 @@ AC_CONFIG_FILES([
+ sysdeps/linux-gnu/s390/Makefile
+ sysdeps/linux-gnu/sparc/Makefile
+ sysdeps/linux-gnu/x86/Makefile
++ sysdeps/linux-gnu/xtensa/Makefile
+ testsuite/Makefile
+ testsuite/ltrace.main/Makefile
+ testsuite/ltrace.minor/Makefile
+diff --git a/sysdeps/linux-gnu/Makefile.am b/sysdeps/linux-gnu/Makefile.am
+index ec26162..857f2da 100644
+--- a/sysdeps/linux-gnu/Makefile.am
++++ b/sysdeps/linux-gnu/Makefile.am
+@@ -18,7 +18,7 @@
+ # 02110-1301 USA
+
+ DIST_SUBDIRS = aarch64 alpha arm cris ia64 m68k metag mips ppc s390 \
+- sparc x86
++ sparc x86 xtensa
+
+ SUBDIRS = \
+ $(HOST_CPU)
+diff --git a/sysdeps/linux-gnu/xtensa/Makefile.am b/sysdeps/linux-gnu/xtensa/Makefile.am
+new file mode 100644
+index 0000000..9ce81e1
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/Makefile.am
+@@ -0,0 +1,36 @@
++# This file is part of ltrace.
++# Copyright (C) 2014 Cadence Design Systems Inc.
++#
++# This program is free software; you can redistribute it and/or
++# modify it under the terms of 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.
++#
++# This program 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 a copy of the GNU General Public License
++# along with this program; if not, write to the Free Software
++# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++# 02110-1301 USA
++
++noinst_LTLIBRARIES = \
++ ../libcpu.la
++
++___libcpu_la_SOURCES = \
++ breakpoint.c \
++ fetch.c \
++ plt.c \
++ regs.c \
++ trace.c
++
++noinst_HEADERS = \
++ arch.h \
++ ptrace.h \
++ signalent.h \
++ syscallent.h
++
++MAINTAINERCLEANFILES = \
++ Makefile.in
+diff --git a/sysdeps/linux-gnu/xtensa/arch.h b/sysdeps/linux-gnu/xtensa/arch.h
+new file mode 100644
+index 0000000..c4d300a
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/arch.h
+@@ -0,0 +1,111 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++#include <gelf.h>
++
++#ifdef __XTENSA_EL__
++
++# define ARCH_ENDIAN_LITTLE
++
++# define BREAKPOINT_VALUE { 0x00, 0x41, 0x00 }
++# define DENSITY_BREAKPOINT_VALUE { 0x2d, 0xf1 }
++
++# define XTENSA_OP0_MASK 0xf
++# define XTENSA_DENSITY_FIRST 0x8
++# define XTENSA_DENSITY_LAST 0xe
++# define XTENSA_SYSCALL_MASK 0xffffff
++# define XTENSA_SYSCALL_VALUE 0x005000
++# define XTENSA_ENTRY_MASK 0xff
++# define XTENSA_ENTRY_VALUE 0x36
++
++#elif defined(__XTENSA_EB__)
++
++# define ARCH_ENDIAN_BIG
++
++# define BREAKPOINT_VALUE { 0x00, 0x14, 0x00 }
++# define DENSITY_BREAKPOINT_VALUE { 0xd2, 0x1f }
++
++# define XTENSA_OP0_MASK 0xf0
++# define XTENSA_DENSITY_FIRST 0x80
++# define XTENSA_DENSITY_LAST 0xe0
++# define XTENSA_SYSCALL_MASK 0xffffff00
++# define XTENSA_SYSCALL_VALUE 0x00050000
++# define XTENSA_ENTRY_MASK 0xff000000
++# define XTENSA_ENTRY_VALUE 0x63000000
++
++#else
++# error __XTENSA_EL__ or __XTENSA_EB__ must be defined
++#endif
++
++#define BREAKPOINT_LENGTH 3
++#define DENSITY_BREAKPOINT_LENGTH 2
++
++#define DECR_PC_AFTER_BREAK 0
++
++#define LT_ELFCLASS ELFCLASS32
++#define LT_ELF_MACHINE EM_XTENSA
++
++static inline int is_density(const void *p)
++{
++ const unsigned char *bytes = p;
++ return (bytes[0] & XTENSA_OP0_MASK) >= XTENSA_DENSITY_FIRST &&
++ (bytes[0] & XTENSA_OP0_MASK) < XTENSA_DENSITY_LAST;
++}
++
++#define ARCH_HAVE_LTELF_DATA
++struct arch_ltelf_data {
++};
++
++enum xtensa_plt_type {
++ XTENSA_DEFAULT,
++ XTENSA_PLT_UNRESOLVED,
++ XTENSA_PLT_RESOLVED,
++};
++
++#define ARCH_HAVE_LIBRARY_DATA
++struct arch_library_data {
++ GElf_Addr loadable_sz;
++};
++
++#define ARCH_HAVE_LIBRARY_SYMBOL_DATA
++struct arch_library_symbol_data {
++ enum xtensa_plt_type type;
++ GElf_Addr resolved_addr;
++};
++
++#define ARCH_HAVE_BREAKPOINT_DATA
++struct arch_breakpoint_data {
++};
++
++#define ARCH_HAVE_PROCESS_DATA
++struct arch_process_data {
++ /* Breakpoint that hits when the dynamic linker is about to
++ * update a .plt slot. NULL before that address is known. */
++ struct breakpoint *dl_plt_update_bp;
++
++ /* PLT update breakpoint looks here for the handler. */
++ struct process_stopping_handler *handler;
++};
++
++#define ARCH_HAVE_ADD_PLT_ENTRY
++#define ARCH_HAVE_DYNLINK_DONE
++#define ARCH_HAVE_ENABLE_BREAKPOINT
++#define ARCH_HAVE_GET_SYMINFO
++#define ARCH_HAVE_FETCH_ARG
+diff --git a/sysdeps/linux-gnu/xtensa/breakpoint.c b/sysdeps/linux-gnu/xtensa/breakpoint.c
+new file mode 100644
+index 0000000..256d1dd
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/breakpoint.c
+@@ -0,0 +1,71 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++#include "config.h"
++
++#include <sys/ptrace.h>
++#include <errno.h>
++#include <string.h>
++#include <stdio.h>
++
++#include "common.h"
++#include "backend.h"
++#include "sysdep.h"
++#include "breakpoint.h"
++#include "proc.h"
++#include "library.h"
++
++void
++arch_enable_breakpoint(pid_t pid, struct breakpoint *sbp)
++{
++ static unsigned char break_insn[] = BREAKPOINT_VALUE;
++ static unsigned char density_break_insn[] = DENSITY_BREAKPOINT_VALUE;
++ unsigned char *bytes;
++ long a;
++
++ debug(DEBUG_PROCESS,
++ "arch_enable_breakpoint: pid=%d, addr=%p, symbol=%s",
++ pid, sbp->addr, breakpoint_name(sbp));
++
++ errno = 0;
++ a = ptrace(PTRACE_PEEKTEXT, pid, sbp->addr, 0);
++ if (a == -1 && errno) {
++ fprintf(stderr, "enable_breakpoint"
++ " pid=%d, addr=%p, symbol=%s: %s\n",
++ pid, sbp->addr, breakpoint_name(sbp),
++ strerror(errno));
++ return;
++ }
++ bytes = (unsigned char *)&a;
++ memcpy(sbp->orig_value, bytes, BREAKPOINT_LENGTH);
++ if (is_density(bytes)) {
++ memcpy(bytes, density_break_insn, DENSITY_BREAKPOINT_LENGTH);
++ } else {
++ memcpy(bytes, break_insn, BREAKPOINT_LENGTH);
++ }
++ a = ptrace(PTRACE_POKETEXT, pid, sbp->addr, a);
++ if (a == -1) {
++ fprintf(stderr, "enable_breakpoint"
++ " pid=%d, addr=%p, symbol=%s: %s\n",
++ pid, sbp->addr, breakpoint_name(sbp),
++ strerror(errno));
++ return;
++ }
++}
+diff --git a/sysdeps/linux-gnu/xtensa/fetch.c b/sysdeps/linux-gnu/xtensa/fetch.c
+new file mode 100644
+index 0000000..c211ac5
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/fetch.c
+@@ -0,0 +1,188 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++#include <sys/ptrace.h>
++#include <asm/ptrace.h>
++#include <assert.h>
++#include <elf.h>
++#include <libelf.h>
++#include <stdint.h>
++#include <stdio.h>
++#include <stdlib.h>
++#include <string.h>
++#include <stdbool.h>
++
++#include "backend.h"
++#include "fetch.h"
++#include "library.h"
++#include "proc.h"
++#include "ptrace.h"
++#include "type.h"
++#include "value.h"
++
++enum {
++ MAX_REG_ARG_WORDS = 6,
++ REG_ARG_BASE_REG = 2,
++
++ MAX_RETURN_WORDS = 4,
++ RETURN_BASE_REG = 10,
++ SYSCALL_RETURN_BASE_REG = 2,
++};
++
++struct fetch_context {
++ unsigned arg_word_idx;
++ arch_addr_t sp;
++ arch_addr_t ret_struct;
++
++};
++
++struct fetch_context *
++arch_fetch_arg_init(enum tof type, struct process *proc,
++ struct arg_type_info *ret_info)
++{
++ struct fetch_context *ctx = malloc(sizeof(*ctx));
++ size_t ret_sz = type_sizeof(proc, ret_info);
++ unsigned long sp = ptrace(PTRACE_PEEKUSER, proc->pid,
++ (REG_A_BASE + 1), 0);
++
++ if (ctx == NULL || sp == (size_t)-1) {
++ free(ctx);
++ return NULL;
++ }
++
++ ctx->arg_word_idx = 0;
++ ctx->sp = (arch_addr_t)sp;
++ ctx->ret_struct = NULL;
++
++ if (ret_sz > MAX_RETURN_WORDS * sizeof(long)) {
++ unsigned long a2 = ptrace(PTRACE_PEEKUSER, proc->pid,
++ (REG_A_BASE + 2), 0);
++ ctx->ret_struct = (arch_addr_t)a2;
++ ++ctx->arg_word_idx;
++ }
++
++ return ctx;
++}
++
++struct fetch_context *
++arch_fetch_arg_clone(struct process *proc,
++ struct fetch_context *ctx)
++{
++ struct fetch_context *clone = malloc(sizeof(*ctx));
++
++ if (clone == NULL)
++ return NULL;
++ *clone = *ctx;
++ return clone;
++}
++
++int
++arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
++ struct process *proc,
++ struct arg_type_info *info, struct value *valuep)
++{
++ size_t sz = type_sizeof(proc, info);
++ size_t al = type_alignof(proc, info);
++ size_t words = (sz + sizeof(long) - 1) / sizeof(long);
++
++ assert(sz != (size_t)-1);
++ assert(al != (size_t)-1);
++
++ if (al > sizeof(long)) {
++ al /= sizeof(long);
++ ctx->arg_word_idx = (ctx->arg_word_idx + al - 1) & ~(al - 1);
++ }
++
++ if (ctx->arg_word_idx + words <= MAX_REG_ARG_WORDS) {
++ size_t i;
++ unsigned char *data = value_reserve(valuep, sz);
++
++ if (data == NULL)
++ return -1;
++
++ for (i = 0; i < words; ++i) {
++ static const unsigned syscall_reg[] = {
++ 6, 3, 4, 5, 8, 9
++ };
++ unsigned regnr =
++ (type == LT_TOF_FUNCTION ?
++ REG_ARG_BASE_REG + ctx->arg_word_idx + i :
++ syscall_reg[ctx->arg_word_idx + i]);
++ unsigned long a = ptrace(PTRACE_PEEKUSER, proc->pid,
++ (REG_A_BASE + regnr), 0);
++ size_t copy = sizeof(a) < sz ? sizeof(a) : sz;
++
++ memcpy(data, &a, copy);
++ data += sizeof(long);
++ sz -= copy;
++ }
++ ctx->arg_word_idx += words;
++ return 0;
++ } else if (ctx->arg_word_idx < MAX_REG_ARG_WORDS) {
++ ctx->arg_word_idx = MAX_REG_ARG_WORDS;
++ }
++
++ value_in_inferior(valuep, ctx->sp + sizeof(long) *
++ (ctx->arg_word_idx - MAX_REG_ARG_WORDS));
++ ctx->arg_word_idx += words;
++
++ return 0;
++}
++
++int
++arch_fetch_retval(struct fetch_context *ctx, enum tof type,
++ struct process *proc, struct arg_type_info *info,
++ struct value *valuep)
++{
++ size_t sz = type_sizeof(proc, info);
++ size_t words = (sz + sizeof(long) - 1) / sizeof(long);
++
++ assert(sz != (size_t)-1);
++
++ if (words <= MAX_RETURN_WORDS) {
++ size_t i;
++ unsigned char *data = value_reserve(valuep, sz);
++
++ if (data == NULL)
++ return -1;
++
++ for (i = 0; i < words; ++i) {
++ unsigned regnr = i +
++ (type == LT_TOF_FUNCTIONR ?
++ RETURN_BASE_REG : SYSCALL_RETURN_BASE_REG);
++ unsigned long a = ptrace(PTRACE_PEEKUSER, proc->pid,
++ (REG_A_BASE + regnr), 0);
++ size_t copy = sizeof(a) < sz ? sizeof(a) : sz;
++
++ memcpy(data, &a, copy);
++ data += sizeof(long);
++ sz -= copy;
++ }
++ } else {
++ value_in_inferior(valuep, ctx->ret_struct);
++ }
++ return 0;
++}
++
++void
++arch_fetch_arg_done(struct fetch_context *context)
++{
++ free(context);
++}
+diff --git a/sysdeps/linux-gnu/xtensa/plt.c b/sysdeps/linux-gnu/xtensa/plt.c
+new file mode 100644
+index 0000000..dd0a0f1
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/plt.c
+@@ -0,0 +1,463 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++#include <errno.h>
++#include <error.h>
++#include <gelf.h>
++#include <inttypes.h>
++#include <string.h>
++#include <sys/ptrace.h>
++
++#include "common.h"
++#include "debug.h"
++#include "proc.h"
++#include "library.h"
++#include "breakpoint.h"
++#include "backend.h"
++#include "trace.h"
++
++static void
++mark_as_resolved(struct process *proc, struct library_symbol *libsym,
++ GElf_Addr value)
++{
++ arch_addr_t addr = (arch_addr_t)(intptr_t)libsym->arch.resolved_addr;
++ struct breakpoint *bp = insert_breakpoint_at(proc, addr, libsym);
++
++ if (bp != NULL) {
++ enable_breakpoint(proc, bp);
++ }
++ libsym->arch.type = XTENSA_PLT_RESOLVED;
++ libsym->arch.resolved_addr = value;
++}
++
++static int
++read_plt_slot_value(struct process *proc, arch_addr_t addr, GElf_Addr *valp)
++{
++ long l = ptrace(PTRACE_PEEKTEXT, proc->pid, addr);
++
++ if (l < 0) {
++ debug(DEBUG_EVENT, "ptrace .plt slot value @%p: %s",
++ addr, strerror(errno));
++ return -1;
++ }
++
++ *valp = (GElf_Addr)l;
++ return 0;
++}
++
++static int
++unresolve_plt_slot(struct process *proc, arch_addr_t addr, GElf_Addr value)
++{
++ if (ptrace(PTRACE_POKETEXT, proc->pid, addr,
++ (void *)(intptr_t)value) < 0) {
++ debug(DEBUG_EVENT, "failed to unresolve .plt slot @%p: %s",
++ addr, strerror(errno));
++ return -1;
++ }
++ return 0;
++}
++
++int
++arch_elf_init(struct ltelf *lte, struct library *lib)
++{
++ Elf_Scn *scn;
++ GElf_Shdr shdr;
++ GElf_Addr relplt_addr;
++ GElf_Phdr phdr;
++ GElf_Addr low, high;
++ int has_loadable = 0;
++ size_t i;
++
++ for (i = 0; gelf_getphdr(lte->elf, i, &phdr) != NULL; ++i) {
++ if (phdr.p_type == PT_LOAD) {
++ if (has_loadable) {
++ if (phdr.p_vaddr < low)
++ low = phdr.p_vaddr;
++ if (phdr.p_vaddr + phdr.p_memsz > high)
++ high = phdr.p_vaddr + phdr.p_memsz;
++ } else {
++ has_loadable = 1;
++ low = phdr.p_vaddr;
++ high = phdr.p_vaddr + phdr.p_memsz;
++ }
++ }
++ }
++ lib->arch.loadable_sz = has_loadable ? high - low : 0;
++
++ if (elf_load_dynamic_entry(lte, DT_JMPREL, &relplt_addr) < 0 ||
++ elf_get_section_covering(lte, relplt_addr, &scn, &shdr) < 0 ||
++ scn == NULL)
++ return 0;
++
++ if (elf_read_relocs(lte, scn, &shdr, &lte->plt_relocs) < 0) {
++ fprintf(stderr, "Couldn't get .rel*.plt data: %s\n",
++ elf_errmsg(-1));
++ return -1;
++ }
++ return 0;
++}
++
++void
++arch_elf_destroy(struct ltelf *lte)
++{
++}
++
++int
++arch_get_sym_info(struct ltelf *lte, const char *filename,
++ size_t sym_index, GElf_Rela *rela, GElf_Sym *sym)
++{
++ if (gelf_getsym(lte->dynsym, ELF64_R_SYM(rela->r_info), sym) == NULL)
++ return -1;
++
++ /* .rela.plt entries that reference locally defined functions point
++ * to their entry points directly, not to PLT entries. Skip such
++ * symbols. */
++ if (sym->st_shndx != SHN_UNDEF) {
++ const char *name = lte->dynstr + sym->st_name;
++ debug(2, "symbol %s does not have plt entry", name);
++ return 1;
++ }
++
++ return 0;
++}
++
++enum plt_status
++arch_elf_add_plt_entry(struct process *proc, struct ltelf *lte,
++ const char *name, GElf_Rela *rela, size_t ndx,
++ struct library_symbol **ret)
++{
++ if (default_elf_add_plt_entry(proc, lte, name, rela, ndx, ret) < 0) {
++ return PLT_FAIL;
++ }
++
++ /* All PLT library symbols are initially marked as delayed. Some of
++ * them may reference weak symbols that are never loaded, sym2addr for
++ * such entries will return NULL. All other symbols are activated
++ * after the dynlink is done. */
++ (*ret)->delayed = 1;
++ return PLT_OK;
++}
++
++void
++arch_dynlink_done(struct process *proc)
++{
++ struct library_symbol *libsym = NULL;
++
++ while ((libsym = proc_each_symbol(proc, libsym,
++ library_symbol_delayed_cb, NULL))) {
++ assert(libsym->plt_type == LS_TOPLT_EXEC);
++
++ if (read_plt_slot_value(proc, libsym->enter_addr,
++ &libsym->arch.resolved_addr) == 0 &&
++ libsym->arch.resolved_addr) {
++ GElf_Addr base =
++ (GElf_Addr)(intptr_t)libsym->lib->base;
++ GElf_Addr sz = libsym->lib->arch.loadable_sz;
++
++ /* Some references may be resolved at this point, they
++ * will point outside the loadable area of their own
++ * library. */
++ if (libsym->arch.resolved_addr >= base &&
++ libsym->arch.resolved_addr - base < sz) {
++ libsym->arch.type = XTENSA_PLT_UNRESOLVED;
++ proc_activate_delayed_symbol(proc, libsym);
++ } else {
++ libsym->arch.type = XTENSA_PLT_RESOLVED;
++ }
++ }
++ }
++}
++
++GElf_Addr arch_plt_sym_val(struct ltelf *lte, size_t ndx, GElf_Rela * rela)
++{
++ return rela->r_offset;
++}
++
++void *sym2addr(struct process *proc, struct library_symbol *sym)
++{
++ void *addr = NULL;
++ long ret = ptrace(PTRACE_PEEKTEXT, proc->pid, sym->enter_addr, 0);
++
++ switch (sym->plt_type) {
++ case LS_TOPLT_NONE:
++ addr = sym->enter_addr;
++
++ /* Not every exported function starts with ENTRY instruction,
++ * e.g. _start does not. Only skip first instruction if it's
++ * entry, otherwise don't do it: if the first instruction is
++ * FLIX or density it will break it or the following
++ * instruction. */
++ if ((ret & XTENSA_ENTRY_MASK) == XTENSA_ENTRY_VALUE) {
++ addr += 3;
++ }
++ break;
++
++ case LS_TOPLT_EXEC:
++
++ /* OTOH every PLT entry starts with ENTRY. Put initial
++ * breakpoint after it. After symbol resolution put
++ * additional breakpoint at the first instruction. */
++ addr = (ret == -1 || ret == 0) ? NULL : (void *)(ret + 3);
++ break;
++ }
++ return addr;
++}
++
++int
++arch_library_symbol_init(struct library_symbol *libsym)
++{
++ libsym->arch.type = XTENSA_DEFAULT;
++ return 0;
++}
++
++void
++arch_library_symbol_destroy(struct library_symbol *libsym)
++{
++}
++
++int
++arch_library_symbol_clone(struct library_symbol *retp,
++ struct library_symbol *libsym)
++{
++ retp->arch = libsym->arch;
++ return 0;
++}
++
++static void
++dl_plt_update_bp_on_hit(struct breakpoint *bp, struct process *proc)
++{
++ debug(DEBUG_PROCESS, "pid=%d dl_plt_update_bp_on_hit %s(%p)",
++ proc->pid, breakpoint_name(bp), bp->addr);
++ struct process_stopping_handler *self = proc->arch.handler;
++ assert(self != NULL);
++
++ struct library_symbol *libsym = self->breakpoint_being_enabled->libsym;
++ GElf_Addr value;
++ if (read_plt_slot_value(proc, libsym->enter_addr, &value) < 0)
++ return;
++
++ unresolve_plt_slot(proc, libsym->enter_addr,
++ libsym->arch.resolved_addr);
++ mark_as_resolved(proc, libsym, value);
++
++ /* cb_on_all_stopped looks if HANDLER is set to NULL as a way
++ * to check that this was run. It's an error if it
++ * wasn't. */
++ proc->arch.handler = NULL;
++
++ breakpoint_turn_off(bp, proc);
++}
++
++static enum callback_status
++cb_keep_stepping_p(struct process_stopping_handler *self)
++{
++ struct process *proc = self->task_enabling_breakpoint;
++ struct library_symbol *libsym = self->breakpoint_being_enabled->libsym;
++
++ GElf_Addr value;
++ if (read_plt_slot_value(proc, libsym->enter_addr, &value) < 0)
++ return CBS_FAIL;
++
++ /* In UNRESOLVED state, the resolved_addr in fact contains
++ * the PLT entry value. */
++ if (value == libsym->arch.resolved_addr) {
++ /* Don't try to single-step over our own breakpoint infinitely.
++ * This may happen if we fail to detect resolved PLT entry. */
++ if (address2bpstruct(proc, get_instruction_pointer(proc))) {
++ return CBS_FAIL;
++ }
++ return CBS_CONT;
++ }
++
++ debug(DEBUG_PROCESS, "pid=%d PLT got resolved to value %#"PRIx64,
++ proc->pid, value);
++
++ /* The .plt slot got resolved! We can migrate the breakpoint
++ * to RESOLVED and stop single-stepping. */
++ if (unresolve_plt_slot(proc, libsym->enter_addr,
++ libsym->arch.resolved_addr) < 0)
++ return CBS_FAIL;
++
++ /* Install breakpoint to the address where the change takes
++ * place. If we fail, then that just means that we'll have to
++ * singlestep the next time around as well. */
++ struct process *leader = proc->leader;
++ if (leader == NULL || leader->arch.dl_plt_update_bp != NULL)
++ goto done;
++
++ arch_addr_t addr = get_instruction_pointer(proc);
++ struct breakpoint *dl_plt_update_bp =
++ insert_breakpoint_at(proc, addr, NULL);
++ if (dl_plt_update_bp == NULL)
++ goto done;
++
++ leader->arch.dl_plt_update_bp = dl_plt_update_bp;
++
++ static struct bp_callbacks dl_plt_update_cbs = {
++ .on_hit = dl_plt_update_bp_on_hit,
++ };
++ breakpoint_set_callbacks(dl_plt_update_bp, &dl_plt_update_cbs);
++
++ /* Turn it off for now. We will turn it on again when we hit
++ * the PLT entry that needs this. */
++ breakpoint_turn_off(dl_plt_update_bp, proc);
++
++done:
++ mark_as_resolved(proc, libsym, value);
++
++ return CBS_STOP;
++}
++
++static void
++cb_on_all_stopped(struct process_stopping_handler *self)
++{
++ /* Put that in for dl_plt_update_bp_on_hit to see. */
++ assert(self->task_enabling_breakpoint->arch.handler == NULL);
++ self->task_enabling_breakpoint->arch.handler = self;
++
++ linux_ptrace_disable_and_continue(self);
++}
++
++static void
++xtensa_plt_bp_hit(struct breakpoint *bp, struct process *proc)
++{
++ struct library_symbol *libsym = bp->libsym;
++
++ if (libsym->arch.type == XTENSA_PLT_RESOLVED) {
++ arch_addr_t addr =
++ (arch_addr_t)(intptr_t)libsym->arch.resolved_addr;
++
++ set_instruction_pointer(proc, addr);
++ ptrace(PTRACE_SINGLESTEP, proc->pid, NULL, NULL);
++ return;
++ }
++}
++
++static void
++xtensa_plt_bp_continue(struct breakpoint *bp, struct process *proc)
++{
++ struct process *leader = proc->leader;
++ void (*on_all_stopped)(struct process_stopping_handler *) = NULL;
++ enum callback_status (*keep_stepping_p)
++ (struct process_stopping_handler *) = NULL;
++
++ if (bp->libsym->arch.type != XTENSA_PLT_UNRESOLVED) {
++ continue_process(proc->pid);
++ return;
++ }
++
++ if (leader != NULL && leader->arch.dl_plt_update_bp != NULL &&
++ breakpoint_turn_on(leader->arch.dl_plt_update_bp, proc) >= 0) {
++ on_all_stopped = cb_on_all_stopped;
++ } else {
++ keep_stepping_p = cb_keep_stepping_p;
++ }
++
++ if (process_install_stopping_handler(proc, bp, on_all_stopped,
++ keep_stepping_p, NULL) < 0) {
++ fprintf(stderr, "%s: couldn't install event handler\n",
++ __func__);
++ continue_after_breakpoint(proc, bp);
++ }
++}
++
++/* For some symbol types, we need to set up custom callbacks.
++ */
++int
++arch_breakpoint_init(struct process *proc, struct breakpoint *bp)
++{
++ /* Artificial and entry-point breakpoints are plain. */
++ if (bp->libsym == NULL || bp->libsym->plt_type != LS_TOPLT_EXEC)
++ return 0;
++
++ static struct bp_callbacks cbs = {
++ .on_hit = xtensa_plt_bp_hit,
++ .on_continue = xtensa_plt_bp_continue,
++ };
++ breakpoint_set_callbacks(bp, &cbs);
++
++ return 0;
++}
++
++void
++arch_breakpoint_destroy(struct breakpoint *bp)
++{
++}
++
++int
++arch_breakpoint_clone(struct breakpoint *retp, struct breakpoint *sbp)
++{
++ retp->arch = sbp->arch;
++ return 0;
++}
++
++int
++arch_process_init(struct process *proc)
++{
++ proc->arch.dl_plt_update_bp = NULL;
++ return 0;
++}
++
++void
++arch_process_destroy(struct process *proc)
++{
++}
++
++int
++arch_process_clone(struct process *retp, struct process *proc)
++{
++ retp->arch = proc->arch;
++
++ if (retp->arch.dl_plt_update_bp != NULL) {
++ /* Point it to the corresponding breakpoint in RETP.
++ * It must be there, this part of PROC has already
++ * been cloned to RETP. */
++ retp->arch.dl_plt_update_bp
++ = address2bpstruct(retp,
++ retp->arch.dl_plt_update_bp->addr);
++
++ assert(retp->arch.dl_plt_update_bp != NULL);
++ }
++
++ return 0;
++}
++
++int
++arch_process_exec(struct process *proc)
++{
++ return arch_process_init(proc);
++}
++
++int
++arch_library_init(struct library *lib)
++{
++ return 0;
++}
++
++void
++arch_library_destroy(struct library *lib)
++{
++}
++
++int
++arch_library_clone(struct library *retp, struct library *lib)
++{
++ return 0;
++}
+diff --git a/sysdeps/linux-gnu/xtensa/ptrace.h b/sysdeps/linux-gnu/xtensa/ptrace.h
+new file mode 100644
+index 0000000..6e67fff
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/ptrace.h
+@@ -0,0 +1,21 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++#include <sys/ptrace.h>
+diff --git a/sysdeps/linux-gnu/xtensa/regs.c b/sysdeps/linux-gnu/xtensa/regs.c
+new file mode 100644
+index 0000000..a5a8c8d
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/regs.c
+@@ -0,0 +1,83 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++#include "config.h"
++
++#include <errno.h>
++#include <string.h>
++#include <sys/types.h>
++#include <sys/ptrace.h>
++#include <asm/ptrace.h>
++
++#include "proc.h"
++#include "common.h"
++
++static int xtensa_peek_user(struct process *proc, unsigned addr,
++ unsigned long *res)
++{
++ long retval;
++
++ errno = 0;
++ retval = ptrace(PTRACE_PEEKUSER, proc->pid, addr, 0);
++ if (retval == -1 && errno) {
++ fprintf(stderr, "%s: pid=%d, %s\n",
++ __func__, proc->pid, strerror(errno));
++ *res = 0;
++ return 0;
++ }
++ *res = retval;
++ return 1;
++}
++
++void *get_instruction_pointer(struct process *proc)
++{
++ unsigned long res;
++
++ if (xtensa_peek_user(proc, REG_PC, &res))
++ return (void *)res;
++ else
++ return NULL;
++}
++
++void set_instruction_pointer(struct process *proc, void *addr)
++{
++ ptrace(PTRACE_POKEUSER, proc->pid, REG_PC, addr);
++}
++
++void *get_stack_pointer(struct process *proc)
++{
++ unsigned long res;
++
++ if (xtensa_peek_user(proc, REG_A_BASE + 1, &res))
++ return (void *)res;
++ else
++ return NULL;
++}
++
++void *get_return_addr(struct process *proc, void *stack_pointer)
++{
++ unsigned long res;
++
++ if (xtensa_peek_user(proc, REG_A_BASE, &res))
++ /* Assume call8, mask the upper 2 bits. */
++ return (void *)(0x3FFFFFFF & res);
++ else
++ return NULL;
++}
+diff --git a/sysdeps/linux-gnu/xtensa/signalent.h b/sysdeps/linux-gnu/xtensa/signalent.h
+new file mode 100644
+index 0000000..953534d
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/signalent.h
+@@ -0,0 +1,52 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++ "SIG_0", /* 0 */
++ "SIGHUP", /* 1 */
++ "SIGINT", /* 2 */
++ "SIGQUIT", /* 3 */
++ "SIGILL", /* 4 */
++ "SIGTRAP", /* 5 */
++ "SIGABRT", /* 6 */
++ "SIGBUS", /* 7 */
++ "SIGFPE", /* 8 */
++ "SIGKILL", /* 9 */
++ "SIGUSR1", /* 10 */
++ "SIGSEGV", /* 11 */
++ "SIGUSR2", /* 12 */
++ "SIGPIPE", /* 13 */
++ "SIGALRM", /* 14 */
++ "SIGTERM", /* 15 */
++ "SIGSTKFLT", /* 16 */
++ "SIGCHLD", /* 17 */
++ "SIGCONT", /* 18 */
++ "SIGSTOP", /* 19 */
++ "SIGTSTP", /* 20 */
++ "SIGTTIN", /* 21 */
++ "SIGTTOU", /* 22 */
++ "SIGURG", /* 23 */
++ "SIGXCPU", /* 24 */
++ "SIGXFSZ", /* 25 */
++ "SIGVTALRM", /* 26 */
++ "SIGPROF", /* 27 */
++ "SIGWINCH", /* 28 */
++ "SIGIO", /* 29 */
++ "SIGPWR", /* 30 */
++ "SIGSYS", /* 31 */
+diff --git a/sysdeps/linux-gnu/xtensa/syscallent.h b/sysdeps/linux-gnu/xtensa/syscallent.h
+new file mode 100644
+index 0000000..ff19d83
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/syscallent.h
+@@ -0,0 +1,357 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++ "spill", /* 0 */
++ "xtensa", /* 1 */
++ "available4", /* 2 */
++ "available5", /* 3 */
++ "available6", /* 4 */
++ "available7", /* 5 */
++ "available8", /* 6 */
++ "available9", /* 7 */
++ "open", /* 8 */
++ "close", /* 9 */
++ "dup", /* 10 */
++ "dup2", /* 11 */
++ "read", /* 12 */
++ "write", /* 13 */
++ "select", /* 14 */
++ "lseek", /* 15 */
++ "poll", /* 16 */
++ "_llseek", /* 17 */
++ "epoll_wait", /* 18 */
++ "epoll_ctl", /* 19 */
++ "epoll_create", /* 20 */
++ "creat", /* 21 */
++ "truncate", /* 22 */
++ "ftruncate", /* 23 */
++ "readv", /* 24 */
++ "writev", /* 25 */
++ "fsync", /* 26 */
++ "fdatasync", /* 27 */
++ "truncate64", /* 28 */
++ "ftruncate64", /* 29 */
++ "pread64", /* 30 */
++ "pwrite64", /* 31 */
++ "link", /* 32 */
++ "rename", /* 33 */
++ "symlink", /* 34 */
++ "readlink", /* 35 */
++ "mknod", /* 36 */
++ "pipe", /* 37 */
++ "unlink", /* 38 */
++ "rmdir", /* 39 */
++ "mkdir", /* 40 */
++ "chdir", /* 41 */
++ "fchdir", /* 42 */
++ "getcwd", /* 43 */
++ "chmod", /* 44 */
++ "chown", /* 45 */
++ "stat", /* 46 */
++ "stat64", /* 47 */
++ "lchown", /* 48 */
++ "lstat", /* 49 */
++ "lstat64", /* 50 */
++ "available51", /* 51 */
++ "fchmod", /* 52 */
++ "fchown", /* 53 */
++ "fstat", /* 54 */
++ "fstat64", /* 55 */
++ "flock", /* 56 */
++ "access", /* 57 */
++ "umask", /* 58 */
++ "getdents", /* 59 */
++ "getdents64", /* 60 */
++ "fcntl64", /* 61 */
++ "available62", /* 62 */
++ "fadvise64_64", /* 63 */
++ "utime", /* 64 */
++ "utimes", /* 65 */
++ "ioctl", /* 66 */
++ "fcntl", /* 67 */
++ "setxattr", /* 68 */
++ "getxattr", /* 69 */
++ "listxattr", /* 70 */
++ "removexattr", /* 71 */
++ "lsetxattr", /* 72 */
++ "lgetxattr", /* 73 */
++ "llistxattr", /* 74 */
++ "lremovexattr", /* 75 */
++ "fsetxattr", /* 76 */
++ "fgetxattr", /* 77 */
++ "flistxattr", /* 78 */
++ "fremovexattr", /* 79 */
++ "mmap2", /* 80 */
++ "munmap", /* 81 */
++ "mprotect", /* 82 */
++ "brk", /* 83 */
++ "mlock", /* 84 */
++ "munlock", /* 85 */
++ "mlockall", /* 86 */
++ "munlockall", /* 87 */
++ "mremap", /* 88 */
++ "msync", /* 89 */
++ "mincore", /* 90 */
++ "madvise", /* 91 */
++ "shmget", /* 92 */
++ "shmat", /* 93 */
++ "shmctl", /* 94 */
++ "shmdt", /* 95 */
++ "socket", /* 96 */
++ "setsockopt", /* 97 */
++ "getsockopt", /* 98 */
++ "shutdown", /* 99 */
++ "bind", /* 100 */
++ "connect", /* 101 */
++ "listen", /* 102 */
++ "accept", /* 103 */
++ "getsockname", /* 104 */
++ "getpeername", /* 105 */
++ "sendmsg", /* 106 */
++ "recvmsg", /* 107 */
++ "send", /* 108 */
++ "recv", /* 109 */
++ "sendto", /* 110 */
++ "recvfrom", /* 111 */
++ "socketpair", /* 112 */
++ "sendfile", /* 113 */
++ "sendfile64", /* 114 */
++ "sendmmsg", /* 115 */
++ "clone", /* 116 */
++ "execve", /* 117 */
++ "exit", /* 118 */
++ "exit_group", /* 119 */
++ "getpid", /* 120 */
++ "wait4", /* 121 */
++ "waitid", /* 122 */
++ "kill", /* 123 */
++ "tkill", /* 124 */
++ "tgkill", /* 125 */
++ "set_tid_address", /* 126 */
++ "gettid", /* 127 */
++ "setsid", /* 128 */
++ "getsid", /* 129 */
++ "prctl", /* 130 */
++ "personality", /* 131 */
++ "getpriority", /* 132 */
++ "setpriority", /* 133 */
++ "setitimer", /* 134 */
++ "getitimer", /* 135 */
++ "setuid", /* 136 */
++ "getuid", /* 137 */
++ "setgid", /* 138 */
++ "getgid", /* 139 */
++ "geteuid", /* 140 */
++ "getegid", /* 141 */
++ "setreuid", /* 142 */
++ "setregid", /* 143 */
++ "setresuid", /* 144 */
++ "getresuid", /* 145 */
++ "setresgid", /* 146 */
++ "getresgid", /* 147 */
++ "setpgid", /* 148 */
++ "getpgid", /* 149 */
++ "getppid", /* 150 */
++ "getpgrp", /* 151 */
++ "reserved152", /* 152 */
++ "reserved153", /* 153 */
++ "times", /* 154 */
++ "acct", /* 155 */
++ "sched_setaffinity", /* 156 */
++ "sched_getaffinity", /* 157 */
++ "capget", /* 158 */
++ "capset", /* 159 */
++ "ptrace", /* 160 */
++ "semtimedop", /* 161 */
++ "semget", /* 162 */
++ "semop", /* 163 */
++ "semctl", /* 164 */
++ "available165", /* 165 */
++ "msgget", /* 166 */
++ "msgsnd", /* 167 */
++ "msgrcv", /* 168 */
++ "msgctl", /* 169 */
++ "available170", /* 170 */
++ "umount2", /* 171 */
++ "mount", /* 172 */
++ "swapon", /* 173 */
++ "chroot", /* 174 */
++ "pivot_root", /* 175 */
++ "umount", /* 176 */
++ "swapoff", /* 177 */
++ "sync", /* 178 */
++ "syncfs", /* 179 */
++ "setfsuid", /* 180 */
++ "setfsgid", /* 181 */
++ "sysfs", /* 182 */
++ "ustat", /* 183 */
++ "statfs", /* 184 */
++ "fstatfs", /* 185 */
++ "statfs64", /* 186 */
++ "fstatfs64", /* 187 */
++ "setrlimit", /* 188 */
++ "getrlimit", /* 189 */
++ "getrusage", /* 190 */
++ "futex", /* 191 */
++ "gettimeofday", /* 192 */
++ "settimeofday", /* 193 */
++ "adjtimex", /* 194 */
++ "nanosleep", /* 195 */
++ "getgroups", /* 196 */
++ "setgroups", /* 197 */
++ "sethostname", /* 198 */
++ "setdomainname", /* 199 */
++ "syslog", /* 200 */
++ "vhangup", /* 201 */
++ "uselib", /* 202 */
++ "reboot", /* 203 */
++ "quotactl", /* 204 */
++ "nfsservctl", /* 205 */
++ "_sysctl", /* 206 */
++ "bdflush", /* 207 */
++ "uname", /* 208 */
++ "sysinfo", /* 209 */
++ "init_module", /* 210 */
++ "delete_module", /* 211 */
++ "sched_setparam", /* 212 */
++ "sched_getparam", /* 213 */
++ "sched_setscheduler", /* 214 */
++ "sched_getscheduler", /* 215 */
++ "sched_get_priority_max", /* 216 */
++ "sched_get_priority_min", /* 217 */
++ "sched_rr_get_interval", /* 218 */
++ "sched_yield", /* 219 */
++ "220", /* 220 */
++ "221", /* 221 */
++ "available222", /* 222 */
++ "restart_syscall", /* 223 */
++ "sigaltstack", /* 224 */
++ "rt_sigreturn", /* 225 */
++ "rt_sigaction", /* 226 */
++ "rt_sigprocmask", /* 227 */
++ "rt_sigpending", /* 228 */
++ "rt_sigtimedwait", /* 229 */
++ "rt_sigqueueinfo", /* 230 */
++ "rt_sigsuspend", /* 231 */
++ "mq_open", /* 232 */
++ "mq_unlink", /* 233 */
++ "mq_timedsend", /* 234 */
++ "mq_timedreceive", /* 235 */
++ "mq_notify", /* 236 */
++ "mq_getsetattr", /* 237 */
++ "available238", /* 238 */
++ "io_setup", /* 239 */
++ "io_destroy", /* 240 */
++ "io_submit", /* 241 */
++ "io_getevents", /* 242 */
++ "io_cancel", /* 243 */
++ "clock_settime", /* 244 */
++ "clock_gettime", /* 245 */
++ "clock_getres", /* 246 */
++ "clock_nanosleep", /* 247 */
++ "timer_create", /* 248 */
++ "timer_delete", /* 249 */
++ "timer_settime", /* 250 */
++ "timer_gettime", /* 251 */
++ "timer_getoverrun", /* 252 */
++ "reserved253", /* 253 */
++ "lookup_dcookie", /* 254 */
++ "available255", /* 255 */
++ "add_key", /* 256 */
++ "request_key", /* 257 */
++ "keyctl", /* 258 */
++ "available259", /* 259 */
++ "readahead", /* 260 */
++ "remap_file_pages", /* 261 */
++ "migrate_pages", /* 262 */
++ "mbind", /* 263 */
++ "get_mempolicy", /* 264 */
++ "set_mempolicy", /* 265 */
++ "unshare", /* 266 */
++ "move_pages", /* 267 */
++ "splice", /* 268 */
++ "tee", /* 269 */
++ "vmsplice", /* 270 */
++ "available271", /* 271 */
++ "pselect6", /* 272 */
++ "ppoll", /* 273 */
++ "epoll_pwait", /* 274 */
++ "epoll_create1", /* 275 */
++ "inotify_init", /* 276 */
++ "inotify_add_watch", /* 277 */
++ "inotify_rm_watch", /* 278 */
++ "inotify_init1", /* 279 */
++ "getcpu", /* 280 */
++ "kexec_load", /* 281 */
++ "ioprio_set", /* 282 */
++ "ioprio_get", /* 283 */
++ "set_robust_list", /* 284 */
++ "get_robust_list", /* 285 */
++ "available286", /* 286 */
++ "available287", /* 287 */
++ "openat", /* 288 */
++ "mkdirat", /* 289 */
++ "mknodat", /* 290 */
++ "unlinkat", /* 291 */
++ "renameat", /* 292 */
++ "linkat", /* 293 */
++ "symlinkat", /* 294 */
++ "readlinkat", /* 295 */
++ "utimensat", /* 296 */
++ "fchownat", /* 297 */
++ "futimesat", /* 298 */
++ "fstatat64", /* 299 */
++ "fchmodat", /* 300 */
++ "faccessat", /* 301 */
++ "available302", /* 302 */
++ "available303", /* 303 */
++ "signalfd", /* 304 */
++ "305", /* 305 */
++ "eventfd", /* 306 */
++ "recvmmsg", /* 307 */
++ "setns", /* 308 */
++ "signalfd4", /* 309 */
++ "dup3", /* 310 */
++ "pipe2", /* 311 */
++ "timerfd_create", /* 312 */
++ "timerfd_settime", /* 313 */
++ "timerfd_gettime", /* 314 */
++ "available315", /* 315 */
++ "eventfd2", /* 316 */
++ "preadv", /* 317 */
++ "pwritev", /* 318 */
++ "available319", /* 319 */
++ "fanotify_init", /* 320 */
++ "fanotify_mark", /* 321 */
++ "process_vm_readv", /* 322 */
++ "process_vm_writev", /* 323 */
++ "name_to_handle_at", /* 324 */
++ "open_by_handle_at", /* 325 */
++ "sync_file_range", /* 326 */
++ "perf_event_open", /* 327 */
++ "rt_tgsigqueueinfo", /* 328 */
++ "clock_adjtime", /* 329 */
++ "prlimit64", /* 330 */
++ "kcmp", /* 331 */
++ "finit_module", /* 332 */
++ "accept4", /* 333 */
++ "sched_setattr", /* 334 */
++ "sched_getattr", /* 335 */
++ "syscall_count", /* 336 */
+diff --git a/sysdeps/linux-gnu/xtensa/trace.c b/sysdeps/linux-gnu/xtensa/trace.c
+new file mode 100644
+index 0000000..c7d3077
+--- /dev/null
++++ b/sysdeps/linux-gnu/xtensa/trace.c
+@@ -0,0 +1,61 @@
++/*
++ * This file is part of ltrace.
++ * Copyright (C) 2014 Cadence Design Systems Inc.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of 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.
++ *
++ * This program 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 a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ */
++
++#include "config.h"
++
++#include <sys/types.h>
++#include <sys/wait.h>
++#include <signal.h>
++#include <sys/ptrace.h>
++#include <asm/ptrace.h>
++
++#include "common.h"
++#include "proc.h"
++
++void
++get_arch_dep(struct process *proc)
++{
++}
++
++/* Returns 1 if syscall, 2 if sysret, 0 otherwise. */
++int syscall_p(struct process *proc, int status, int *sysnum)
++{
++ if (WIFSTOPPED(status)
++ && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
++ /* get the user's pc */
++ int pc = ptrace(PTRACE_PEEKUSER, proc->pid, REG_PC, 0);
++
++ /* fetch the SWI instruction */
++ int insn = ptrace(PTRACE_PEEKTEXT, proc->pid, pc - 3, 0);
++
++ *sysnum = ptrace(PTRACE_PEEKUSER, proc->pid, SYSCALL_NR, 0);
++ /* if it is a syscall, return 1 or 2 */
++ if ((insn & XTENSA_SYSCALL_MASK) == XTENSA_SYSCALL_VALUE) {
++ if ((proc->callstack_depth > 0)
++ && proc->callstack[proc->callstack_depth
++ - 1].is_syscall) {
++ return 2;
++ } else {
++ return 1;
++ }
++ }
++ }
++ return 0;
++}
+--
+1.8.1.4
+
diff --git a/package/ltrace/Config.in b/package/ltrace/Config.in
index 56e4402b88..e7237da801 100644
--- a/package/ltrace/Config.in
+++ b/package/ltrace/Config.in
@@ -5,7 +5,7 @@ config BR2_PACKAGE_LTRACE
# 'relplt_count'). Issue reported upstream at
# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756764.
depends on (BR2_i386 || BR2_arm \
- || BR2_powerpc || BR2_sparc || BR2_x86_64)
+ || BR2_powerpc || BR2_sparc || BR2_x86_64 || BR2_xtensa)
select BR2_PACKAGE_ELFUTILS
depends on BR2_LARGEFILE # elfutils
depends on BR2_USE_WCHAR # elfutils