Release 4.10 tools/perf/util/unwind-libunwind-local.c

/*
 * Post mortem Dwarf CFI based unwinding on top of regs and stack dumps.
 *
 * Lots of this code have been borrowed or heavily inspired from parts of
 * the libunwind 0.99 code which are (amongst other contributors I may have
 * forgotten):
 *
 * Copyright (C) 2002-2007 Hewlett-Packard Co
 *      Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
 *
 * And the bugs have been added by:
 *
 * Copyright (C) 2010, Frederic Weisbecker <fweisbec@gmail.com>
 * Copyright (C) 2012, Jiri Olsa <jolsa@redhat.com>
 *
 */

#include <elf.h>
#include <gelf.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <linux/list.h>
#ifndef REMOTE_UNWIND_LIBUNWIND
#include <libunwind.h>
#include <libunwind-ptrace.h>
#endif
#include "callchain.h"
#include "thread.h"
#include "session.h"
#include "perf_regs.h"
#include "unwind.h"
#include "symbol.h"
#include "util.h"
#include "debug.h"
#include "asm/bug.h"

extern int
UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
				    unw_word_t ip,
				    unw_dyn_info_t *di,
				    unw_proc_info_t *pi,
				    int need_unwind_info, void *arg);


#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)

extern int
UNW_OBJ(dwarf_find_debug_frame) (int found, unw_dyn_info_t *di_debug,
				 unw_word_t ip,
				 unw_word_t segbase,
				 const char *obj_name, unw_word_t start,
				 unw_word_t end);


#define dwarf_find_debug_frame UNW_OBJ(dwarf_find_debug_frame)


#define DW_EH_PE_FORMAT_MASK	0x0f	
/* format of the encoded value */

#define DW_EH_PE_APPL_MASK	0x70	
/* how the value is to be applied */

/* Pointer-encoding formats: */

#define DW_EH_PE_omit		0xff

#define DW_EH_PE_ptr		0x00	
/* pointer-sized unsigned value */

#define DW_EH_PE_udata4		0x03	
/* unsigned 32-bit value */

#define DW_EH_PE_udata8		0x04	
/* unsigned 64-bit value */

#define DW_EH_PE_sdata4		0x0b	
/* signed 32-bit value */

#define DW_EH_PE_sdata8		0x0c	
/* signed 64-bit value */

/* Pointer-encoding application: */

#define DW_EH_PE_absptr		0x00	
/* absolute value */

#define DW_EH_PE_pcrel		0x10	
/* rel. to addr. of encoded value */

/*
 * The following are not documented by LSB v1.3, yet they are used by
 * GCC, presumably they aren't documented by LSB since they aren't
 * used on Linux:
 */

#define DW_EH_PE_funcrel	0x40	
/* start-of-procedure-relative */

#define DW_EH_PE_aligned	0x50	
/* aligned pointer */

/* Flags intentionaly not handled, since they're not needed:
 * #define DW_EH_PE_indirect      0x80
 * #define DW_EH_PE_uleb128       0x01
 * #define DW_EH_PE_udata2        0x02
 * #define DW_EH_PE_sleb128       0x09
 * #define DW_EH_PE_sdata2        0x0a
 * #define DW_EH_PE_textrel       0x20
 * #define DW_EH_PE_datarel       0x30
 */


struct unwind_info {
	
struct perf_sample	*sample;
	
struct machine		*machine;
	
struct thread		*thread;
};


#define dw_read(ptr, type, end) ({      \
        type *__p = (type *) ptr;       \
        type  __v;                      \
        if ((__p + 1) > (type *) end)   \
                return -EINVAL;         \
        __v = *__p++;                   \
        ptr = (typeof(ptr)) __p;        \
        __v;                            \
        })



static int __dw_read_encoded_value(u8 **p, u8 *end, u64 *val,
				   u8 encoding)
{
	u8 *cur = *p;
	*val = 0;

	switch (encoding) {
	case DW_EH_PE_omit:
		*val = 0;
		goto out;
	case DW_EH_PE_ptr:
		*val = dw_read(cur, unsigned long, end);
		goto out;
	default:
		break;
	}

	switch (encoding & DW_EH_PE_APPL_MASK) {
	case DW_EH_PE_absptr:
		break;
	case DW_EH_PE_pcrel:
		*val = (unsigned long) cur;
		break;
	default:
		return -EINVAL;
	}

	if ((encoding & 0x07) == 0x00)
		encoding |= DW_EH_PE_udata4;

	switch (encoding & DW_EH_PE_FORMAT_MASK) {
	case DW_EH_PE_sdata4:
		*val += dw_read(cur, s32, end);
		break;
	case DW_EH_PE_udata4:
		*val += dw_read(cur, u32, end);
		break;
	case DW_EH_PE_sdata8:
		*val += dw_read(cur, s64, end);
		break;
	case DW_EH_PE_udata8:
		*val += dw_read(cur, u64, end);
		break;
	default:
		return -EINVAL;
	}

 out:
	*p = cur;
	return 0;
}

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#define dw_read_encoded_value(ptr, end, enc) ({                      \
        u64 __v;                                                \
        if (__dw_read_encoded_value(&ptr, end, &__v, enc)) {    \
                return -EINVAL;                                 \
        }                                                       \
        __v;                                                    \
        })



static u64 elf_section_offset(int fd, const char *name)
{
	Elf *elf;
	GElf_Ehdr ehdr;
	GElf_Shdr shdr;
	u64 offset = 0;

	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
	if (elf == NULL)
		return 0;

	do {
		if (gelf_getehdr(elf, &ehdr) == NULL)
			break;

		if (!elf_section_by_name(elf, &ehdr, &shdr, name, NULL))
			break;

		offset = shdr.sh_offset;
	} while (0);

	elf_end(elf);
	return offset;
}

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#ifndef NO_LIBUNWIND_DEBUG_FRAME


static int elf_is_exec(int fd, const char *name)
{
	Elf *elf;
	GElf_Ehdr ehdr;
	int retval = 0;

	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
	if (elf == NULL)
		return 0;
	if (gelf_getehdr(elf, &ehdr) == NULL)
		goto out;

	retval = (ehdr.e_type == ET_EXEC);

out:
	elf_end(elf);
	pr_debug("unwind: elf_is_exec(%s): %d\n", name, retval);
	return retval;
}
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#endif


struct table_entry {
	
u32 start_ip_offset;
	
u32 fde_offset;
};


struct eh_frame_hdr {
	
unsigned char version;
	
unsigned char eh_frame_ptr_enc;
	
unsigned char fde_count_enc;
	
unsigned char table_enc;

	/*
         * The rest of the header is variable-length and consists of the
         * following members:
         *
         *      encoded_t eh_frame_ptr;
         *      encoded_t fde_count;
         */

	/* A single encoded pointer should not be more than 8 bytes. */
	
u64 enc[2];

	/*
         * struct {
         *    encoded_t start_ip;
         *    encoded_t fde_addr;
         * } binary_search_table[fde_count];
         */
	
char data[0];
} 
__packed;



static int unwind_spec_ehframe(struct dso *dso, struct machine *machine,
			       u64 offset, u64 *table_data, u64 *segbase,
			       u64 *fde_count)
{
	struct eh_frame_hdr hdr;
	u8 *enc = (u8 *) &hdr.enc;
	u8 *end = (u8 *) &hdr.data;
	ssize_t r;

	r = dso__data_read_offset(dso, machine, offset,
				  (u8 *) &hdr, sizeof(hdr));
	if (r != sizeof(hdr))
		return -EINVAL;

	/* We dont need eh_frame_ptr, just skip it. */
	dw_read_encoded_value(enc, end, hdr.eh_frame_ptr_enc);

	*fde_count  = dw_read_encoded_value(enc, end, hdr.fde_count_enc);
	*segbase    = offset;
	*table_data = (enc - (u8 *) &hdr) + offset;
	return 0;
}

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static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine,
				     u64 *table_data, u64 *segbase,
				     u64 *fde_count)
{
	int ret = -EINVAL, fd;
	u64 offset = dso->data.eh_frame_hdr_offset;

	if (offset == 0) {
		fd = dso__data_get_fd(dso, machine);
		if (fd < 0)
			return -EINVAL;

		/* Check the .eh_frame section for unwinding info */
		offset = elf_section_offset(fd, ".eh_frame_hdr");
		dso->data.eh_frame_hdr_offset = offset;
		dso__data_put_fd(dso);
	}

	if (offset)
		ret = unwind_spec_ehframe(dso, machine, offset,
					  table_data, segbase,
					  fde_count);

	return ret;
}

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#ifndef NO_LIBUNWIND_DEBUG_FRAME


static int read_unwind_spec_debug_frame(struct dso *dso,
					struct machine *machine, u64 *offset)
{
	int fd;
	u64 ofs = dso->data.debug_frame_offset;

	if (ofs == 0) {
		fd = dso__data_get_fd(dso, machine);
		if (fd < 0)
			return -EINVAL;

		/* Check the .debug_frame section for unwinding info */
		ofs = elf_section_offset(fd, ".debug_frame");
		dso->data.debug_frame_offset = ofs;
		dso__data_put_fd(dso);
	}

	*offset = ofs;
	if (*offset)
		return 0;

	return -EINVAL;
}
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#endif



static struct map *find_map(unw_word_t ip, struct unwind_info *ui)
{
	struct addr_location al;

	thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
			      MAP__FUNCTION, ip, &al);
	if (!al.map) {
		/*
                 * We've seen cases (softice) where DWARF unwinder went
                 * through non executable mmaps, which we need to lookup
                 * in MAP__VARIABLE tree.
                 */
		thread__find_addr_map(ui->thread, PERF_RECORD_MISC_USER,
				      MAP__VARIABLE, ip, &al);
	}
	return al.map;
}

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static int

find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
	       int need_unwind_info, void *arg)
{
	struct unwind_info *ui = arg;
	struct map *map;
	unw_dyn_info_t di;
	u64 table_data, segbase, fde_count;
	int ret = -EINVAL;

	map = find_map(ip, ui);
	if (!map || !map->dso)
		return -EINVAL;

	pr_debug("unwind: find_proc_info dso %s\n", map->dso->name);

	/* Check the .eh_frame section for unwinding info */
	if (!read_unwind_spec_eh_frame(map->dso, ui->machine,
				       &table_data, &segbase, &fde_count)) {
		memset(&di, 0, sizeof(di));
		di.format   = UNW_INFO_FORMAT_REMOTE_TABLE;
		di.start_ip = map->start;
		di.end_ip   = map->end;
		di.u.rti.segbase    = map->start + segbase - map->pgoff;
		di.u.rti.table_data = map->start + table_data - map->pgoff;
		di.u.rti.table_len  = fde_count * sizeof(struct table_entry)
				      / sizeof(unw_word_t);
		ret = dwarf_search_unwind_table(as, ip, &di, pi,
						need_unwind_info, arg);
	}

#ifndef NO_LIBUNWIND_DEBUG_FRAME
	/* Check the .debug_frame section for unwinding info */
	if (ret < 0 &&
	    !read_unwind_spec_debug_frame(map->dso, ui->machine, &segbase)) {
		int fd = dso__data_get_fd(map->dso, ui->machine);
		int is_exec = elf_is_exec(fd, map->dso->name);
		unw_word_t base = is_exec ? 0 : map->start;
		const char *symfile;

		if (fd >= 0)
			dso__data_put_fd(map->dso);

		symfile = map->dso->symsrc_filename ?: map->dso->name;

		memset(&di, 0, sizeof(di));
		if (dwarf_find_debug_frame(0, &di, ip, base, symfile,
					   map->start, map->end))
			return dwarf_search_unwind_table(as, ip, &di, pi,
							 need_unwind_info, arg);
	}
#endif

	return ret;
}

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wang nan
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rabin vincent
rabin vincent
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namhyung kim
namhyung kim
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stefano sanfilippo
stefano sanfilippo
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static int access_fpreg(unw_addr_space_t __maybe_unused as,
			unw_regnum_t __maybe_unused num,
			unw_fpreg_t __maybe_unused *val,
			int __maybe_unused __write,
			void __maybe_unused *arg)
{
	pr_err("unwind: access_fpreg unsupported\n");
	return -UNW_EINVAL;
}

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static int get_dyn_info_list_addr(unw_addr_space_t __maybe_unused as,
				  unw_word_t __maybe_unused *dil_addr,
				  void __maybe_unused *arg)
{
	return -UNW_ENOINFO;
}

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static int resume(unw_addr_space_t __maybe_unused as,
		  unw_cursor_t __maybe_unused *cu,
		  void __maybe_unused *arg)
{
	pr_err("unwind: resume unsupported\n");
	return -UNW_EINVAL;
}

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static int

get_proc_name(unw_addr_space_t __maybe_unused as,
	      unw_word_t __maybe_unused addr,
		char __maybe_unused *bufp, size_t __maybe_unused buf_len,
		unw_word_t __maybe_unused *offp, void __maybe_unused *arg)
{
	pr_err("unwind: get_proc_name unsupported\n");
	return -UNW_EINVAL;
}

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static int access_dso_mem(struct unwind_info *ui, unw_word_t addr,
			  unw_word_t *data)
{
	struct map *map;
	ssize_t size;

	map = find_map(addr, ui);
	if (!map) {
		pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
		return -1;
	}

	if (!map->dso)
		return -1;

	size = dso__data_read_addr(map->dso, map, ui->machine,
				   addr, (u8 *) data, sizeof(*data));

	return !(size == sizeof(*data));
}

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static int access_mem(unw_addr_space_t __maybe_unused as,
		      unw_word_t addr, unw_word_t *valp,
		      int __write, void *arg)
{
	struct unwind_info *ui = arg;
	struct stack_dump *stack = &ui->sample->user_stack;
	u64 start, end;
	int offset;
	int ret;

	/* Don't support write, probably not needed. */
	if (__write || !stack || !ui->sample->user_regs.regs) {
		*valp = 0;
		return 0;
	}

	ret = perf_reg_value(&start, &ui->sample->user_regs,
			     LIBUNWIND__ARCH_REG_SP);
	if (ret)
		return ret;

	end = start + stack->size;

	/* Check overflow. */
	if (addr + sizeof(unw_word_t) < addr)
		return -EINVAL;

	if (addr < start || addr + sizeof(unw_word_t) >= end) {
		ret = access_dso_mem(ui, addr, valp);
		if (ret) {
			pr_debug("unwind: access_mem %p not inside range"
				 " 0x%" PRIx64 "-0x%" PRIx64 "\n",
				 (void *) (uintptr_t) addr, start, end);
			*valp = 0;
			return ret;
		}
		return 0;
	}

	offset = addr - start;
	*valp  = *(unw_word_t *)&stack->data[offset];
	pr_debug("unwind: access_mem addr %p val %lx, offset %d\n",
		 (void *) (uintptr_t) addr, (unsigned long)*valp, offset);
	return 0;
}

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6
2.45%
1
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irina tirdea
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he kuang
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static int access_reg(unw_addr_space_t __maybe_unused as,
		      unw_regnum_t regnum, unw_word_t *valp,
		      int __write, void *arg)
{
	struct unwind_info *ui = arg;
	int id, ret;
	u64 val;

	/* Don't support write, I suspect we don't need it. */
	if (__write) {
		pr_err("unwind: access_reg w %d\n", regnum);
		return 0;
	}

	if (!ui->sample->user_regs.regs) {
		*valp = 0;
		return 0;
	}

	id = LIBUNWIND__ARCH_REG_ID(regnum);
	if (id < 0)
		return -EINVAL;

	ret = perf_reg_value(&val, &ui->sample->user_regs, id);
	if (ret) {
		pr_err("unwind: can't read reg %d\n", regnum);
		return ret;
	}

	*valp = (unw_word_t) val;
	pr_debug("unwind: reg %d, val %lx\n", regnum, (unsigned long)*valp);
	return 0;
}

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1
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he kuang
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static void put_unwind_info(unw_addr_space_t __maybe_unused as,
			    unw_proc_info_t *pi __maybe_unused,
			    void *arg __maybe_unused)
{
	pr_debug("unwind: put_unwind_info called\n");
}

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static int entry(u64 ip, struct thread *thread,
		 unwind_entry_cb_t cb, void *arg)
{
	struct unwind_entry e;
	struct addr_location al;

	thread__find_addr_location(thread, PERF_RECORD_MISC_USER,
				   MAP__FUNCTION, ip, &al);

	e.ip = al.addr;
	e.map = al.map;
	e.sym = al.sym;

	pr_debug("unwind: %s:ip = 0x%" PRIx64 " (0x%" PRIx64 ")\n",
		 al.sym ? al.sym->name : "''",
		 ip,
		 al.map ? al.map->map_ip(al.map, ip) : (u64) 0);

	return cb(&e, arg);
}

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3
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static void display_error(int err)
{
	switch (err) {
	case UNW_EINVAL:
		pr_err("unwind: Only supports local.\n");
		break;
	case UNW_EUNSPEC:
		pr_err("unwind: Unspecified error.\n");
		break;
	case UNW_EBADREG:
		pr_err("unwind: Register unavailable.\n");
		break;
	default:
		break;
	}
}

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jiri olsa
jiri olsa
44
100.00%
1
100.00%
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44
100.00%
1
100.00%


static unw_accessors_t accessors = {
	.find_proc_info		= find_proc_info,
	.put_unwind_info	= put_unwind_info,
	.get_dyn_info_list_addr	= get_dyn_info_list_addr,
	.access_mem		= access_mem,
	.access_reg		= access_reg,
	.access_fpreg		= access_fpreg,
	.resume			= resume,
	.get_proc_name		= get_proc_name,
};



static int _unwind__prepare_access(struct thread *thread)
{
	if (callchain_param.record_mode != CALLCHAIN_DWARF)
		return 0;

	thread->addr_space = unw_create_addr_space(&accessors, 0);
	if (!thread->addr_space) {
		pr_err("unwind: Can't create unwind address space.\n");
		return -ENOMEM;
	}

	unw_set_caching_policy(thread->addr_space, UNW_CACHE_GLOBAL);
	return 0;
}

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namhyung kim
namhyung kim
56
87.50%
2
50.00%
jiri olsa
jiri olsa
6
9.38%
1
25.00%
he kuang
he kuang
2
3.12%
1
25.00%
Total
64
100.00%
4
100.00%



static void _unwind__flush_access(struct thread *thread)
{
	if (callchain_param.record_mode != CALLCHAIN_DWARF)
		return;

	unw_flush_cache(thread->addr_space, 0, 0);
}

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namhyung kim
namhyung kim
27
87.10%
1
33.33%
jiri olsa
jiri olsa
2
6.45%
1
33.33%
he kuang
he kuang
2
6.45%
1
33.33%
Total
31
100.00%
3
100.00%



static void _unwind__finish_access(struct thread *thread)
{
	if (callchain_param.record_mode != CALLCHAIN_DWARF)
		return;

	unw_destroy_addr_space(thread->addr_space);
}

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namhyung kim
namhyung kim
23
85.19%
1
33.33%
jiri olsa
jiri olsa
2
7.41%
1
33.33%
he kuang
he kuang
2
7.41%
1
33.33%
Total
27
100.00%
3
100.00%



static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
		       void *arg, int max_stack)
{
	u64 val;
	unw_word_t ips[max_stack];
	unw_addr_space_t addr_space;
	unw_cursor_t c;
	int ret, i = 0;

	ret = perf_reg_value(&val, &ui->sample->user_regs,
			     LIBUNWIND__ARCH_REG_IP);
	if (ret)
		return ret;

	ips[i++] = (unw_word_t) val;

	/*
         * If we need more than one entry, do the DWARF
         * unwind itself.
         */
	if (max_stack - 1 > 0) {
		WARN_ONCE(!ui->thread, "WARNING: ui->thread is NULL");
		addr_space = ui->thread->addr_space;

		if (addr_space == NULL)
			return -1;

		ret = unw_init_remote(&c, addr_space, ui);
		if (ret)
			display_error(ret);

		while (!ret && (unw_step(&c) > 0) && i < max_stack) {
			unw_get_reg(&c, UNW_REG_IP, &ips[i]);
			++i;
		}

		max_stack = i;
	}

	/*
         * Display what we got based on the order setup.
         */
	for (i = 0; i < max_stack && !ret; i++) {
		int j = i;

		if (callchain_param.order == ORDER_CALLER)
			j = max_stack - i - 1;
		ret = ips[j] ? entry(ips[j], ui->thread, cb, arg) : 0;
	}

	return ret;
}

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jiri olsa
jiri olsa
236
95.16%
5
62.50%
namhyung kim
namhyung kim
6
2.42%
1
12.50%
arnaldo carvalho de melo
arnaldo carvalho de melo
5
2.02%
1
12.50%
he kuang
he kuang
1
0.40%
1
12.50%
Total
248
100.00%
8
100.00%



static int _unwind__get_entries(unwind_entry_cb_t cb, void *arg,
			struct thread *thread,
			struct perf_sample *data, int max_stack)
{
	struct unwind_info ui = {
		.sample       = data,
		.thread       = thread,
		.machine      = thread->mg->machine,
        };

	if (!data->user_regs.regs)
		return -EINVAL;

	if (max_stack <= 0)
		return -EINVAL;

	return get_entries(&ui, cb, arg, max_stack);
}

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jiri olsa
jiri olsa
76
87.36%
2
40.00%
arnaldo carvalho de melo
arnaldo carvalho de melo
9
10.34%
2
40.00%
he kuang
he kuang
2
2.30%
1
20.00%
Total
87
100.00%
5
100.00%

static struct unwind_libunwind_ops

_unwind_libunwind_ops = {
	.prepare_access = _unwind__prepare_access,
	.flush_access   = _unwind__flush_access,
	.finish_access  = _unwind__finish_access,
	.get_entries    = _unwind__get_entries,
};

#ifndef REMOTE_UNWIND_LIBUNWIND
struct unwind_libunwind_ops *

local_unwind_libunwind_ops = &_unwind_libunwind_ops;
#endif
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jiri olsa
jiri olsa
2206
76.81%
9
29.03%
namhyung kim
namhyung kim
191
6.65%
4
12.90%
jean pihet
jean pihet
186
6.48%
2
6.45%
wang nan
wang nan
138
4.81%
2
6.45%
he kuang
he kuang
56
1.95%
4
12.90%
rabin vincent
rabin vincent
41
1.43%
3
9.68%
irina tirdea
irina tirdea
22
0.77%
1
3.23%
arnaldo carvalho de melo
arnaldo carvalho de melo
14
0.49%
2
6.45%
stefano sanfilippo
stefano sanfilippo
8
0.28%
1
3.23%
masami hiramatsu
masami hiramatsu
5
0.17%
1
3.23%
milian wolff
milian wolff
3
0.10%
1
3.23%
hou pengyang
hou pengyang
2
0.07%
1
3.23%
Total
2872
100.00%
31
100.00%
Directory: tools/perf/util

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