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binutils-gdb/gdb/testsuite/gdb.btrace/i686-tailcall-only.S

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btrace, frame: fix crash in get_frame_type In skip_artificial_frames we repeatedly call get_prev_frame_always until we get a non-inline and non-tailcall frame assuming that there must be such a frame eventually. For record targets, however, we may have a frame chain that consists only of artificial frames. This leads to a crash in get_frame_type when dereferencing a NULL frame pointer. Change skip_artificial_frames and skip_tailcall_frames to return NULL in such a case and modify each caller to cope with a NULL return. In frame_unwind_caller_pc and frame_unwind_caller_arch, we simply assert that the returned value is not NULL. Their caller was supposed to check frame_unwind_caller_id before calling those functions. In other cases, we thrown an error. In infcmd further move the skip_tailcall_frames call to the forward-stepping case since we don't need a frame for reverse execution and we don't want to fail because of that. Reverse-finish does make sense for a tailcall frame. gdb/ * frame.h (skip_tailcall_frames): Update comment. * frame.c (skip_artificial_frames, skip_tailcall_frames): Return NULL if only artificial frames are found. Update comment. (frame_unwind_caller_id): Handle NULL return. (frame_unwind_caller_pc, frame_unwind_caller_arch): Assert that skip_artificial_frames does not return NULL. (frame_pop): Add an error if only tailcall frames are found. * infcmd.c (finish_command): Move skip_tailcall_frames call into forward- execution case. Add an error if only tailcall frames are found. testsuite/ * gdb.btrace/tailcall-only.exp: New. * gdb.btrace/tailcall-only.c: New. * gdb.btrace/x86_64-tailcall-only.S: New. * gdb.btrace/i686-tailcall-only.S: New.
2016-01-26 14:58:44 +01:00
/* This testcase is part of GDB, the GNU debugger.
update copyright year range in GDB files This applies the second part of GDB's End of Year Procedure, which updates the copyright year range in all of GDB's files. gdb/ChangeLog: Update copyright year range in all GDB files.
2017-01-01 07:50:51 +01:00
Copyright 2016-2017 Free Software Foundation, Inc.
btrace, frame: fix crash in get_frame_type In skip_artificial_frames we repeatedly call get_prev_frame_always until we get a non-inline and non-tailcall frame assuming that there must be such a frame eventually. For record targets, however, we may have a frame chain that consists only of artificial frames. This leads to a crash in get_frame_type when dereferencing a NULL frame pointer. Change skip_artificial_frames and skip_tailcall_frames to return NULL in such a case and modify each caller to cope with a NULL return. In frame_unwind_caller_pc and frame_unwind_caller_arch, we simply assert that the returned value is not NULL. Their caller was supposed to check frame_unwind_caller_id before calling those functions. In other cases, we thrown an error. In infcmd further move the skip_tailcall_frames call to the forward-stepping case since we don't need a frame for reverse execution and we don't want to fail because of that. Reverse-finish does make sense for a tailcall frame. gdb/ * frame.h (skip_tailcall_frames): Update comment. * frame.c (skip_artificial_frames, skip_tailcall_frames): Return NULL if only artificial frames are found. Update comment. (frame_unwind_caller_id): Handle NULL return. (frame_unwind_caller_pc, frame_unwind_caller_arch): Assert that skip_artificial_frames does not return NULL. (frame_pop): Add an error if only tailcall frames are found. * infcmd.c (finish_command): Move skip_tailcall_frames call into forward- execution case. Add an error if only tailcall frames are found. testsuite/ * gdb.btrace/tailcall-only.exp: New. * gdb.btrace/tailcall-only.c: New. * gdb.btrace/x86_64-tailcall-only.S: New. * gdb.btrace/i686-tailcall-only.S: New.
2016-01-26 14:58:44 +01:00
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 3 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, see <http://www.gnu.org/licenses/>.
This file has been generated using:
gcc -m32 -march=i686 -S -O2 -dA -g tailcall-only.c -o i686-tailcall-only.S
*/
.file "tailcall-only.c"
.text
.Ltext0:
.p2align 4,,15
.type bar_1, @function
bar_1:
.LFB0:
.file 1 "tailcall-only.c"
# tailcall-only.c:22
.loc 1 22 0
.cfi_startproc
# BLOCK 2 freq:10000 seq:0
# PRED: ENTRY [100.0%] (FALLTHRU)
# tailcall-only.c:24
.loc 1 24 0
movl $42, %eax
# SUCC: EXIT [100.0%]
ret
.cfi_endproc
.LFE0:
.size bar_1, .-bar_1
.p2align 4,,15
.type bar, @function
bar:
.LFB1:
# tailcall-only.c:28
.loc 1 28 0
.cfi_startproc
# BLOCK 2 freq:10000 seq:0
# PRED: ENTRY [100.0%] (FALLTHRU)
# tailcall-only.c:29
.loc 1 29 0
jmp bar_1
# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
.LVL0:
.cfi_endproc
.LFE1:
.size bar, .-bar
.p2align 4,,15
.type foo_1, @function
foo_1:
.LFB2:
# tailcall-only.c:34
.loc 1 34 0
.cfi_startproc
# BLOCK 2 freq:10000 seq:0
# PRED: ENTRY [100.0%] (FALLTHRU)
# tailcall-only.c:35
.loc 1 35 0
jmp bar
# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
.LVL1:
.cfi_endproc
.LFE2:
.size foo_1, .-foo_1
.p2align 4,,15
.type foo, @function
foo:
.LFB3:
# tailcall-only.c:40
.loc 1 40 0
.cfi_startproc
# BLOCK 2 freq:10000 seq:0
# PRED: ENTRY [100.0%] (FALLTHRU)
# tailcall-only.c:41
.loc 1 41 0
jmp foo_1
# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
.LVL2:
.cfi_endproc
.LFE3:
.size foo, .-foo
.section .text.startup,"ax",@progbits
.p2align 4,,15
.globl main
.type main, @function
main:
.LFB4:
# tailcall-only.c:46
.loc 1 46 0
.cfi_startproc
# BLOCK 2 freq:10000 seq:0
# PRED: ENTRY [100.0%] (FALLTHRU)
# tailcall-only.c:49
.loc 1 49 0
call foo
.LVL3:
# tailcall-only.c:50
.loc 1 50 0
addl $1, %eax
.LVL4:
# SUCC: EXIT [100.0%]
# tailcall-only.c:53
.loc 1 53 0
ret
.cfi_endproc
.LFE4:
.size main, .-main
.text
.Letext0:
.section .debug_info,"",@progbits
.Ldebug_info0:
.long 0xd5 # Length of Compilation Unit Info
.value 0x4 # DWARF version number
.long .Ldebug_abbrev0 # Offset Into Abbrev. Section
.byte 0x4 # Pointer Size (in bytes)
.uleb128 0x1 # (DIE (0xb) DW_TAG_compile_unit)
.long .LASF1 # DW_AT_producer: "GNU C 4.8.3 20140911 (Red Hat 4.8.3-9) -m32 -march=i686 -g -O2"
.byte 0x1 # DW_AT_language
.long .LASF2 # DW_AT_name: "tailcall-only.c"
.long .LASF3 # DW_AT_comp_dir: ""
.long .Ldebug_ranges0+0 # DW_AT_ranges
.long 0 # DW_AT_low_pc
.long .Ldebug_line0 # DW_AT_stmt_list
.uleb128 0x2 # (DIE (0x25) DW_TAG_subprogram)
.long .LASF4 # DW_AT_name: "bar_1"
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
.byte 0x15 # DW_AT_decl_line
# DW_AT_prototyped
.long 0x3a # DW_AT_type
.long .LFB0 # DW_AT_low_pc
.long .LFE0-.LFB0 # DW_AT_high_pc
.uleb128 0x1 # DW_AT_frame_base
.byte 0x9c # DW_OP_call_frame_cfa
# DW_AT_GNU_all_call_sites
.uleb128 0x3 # (DIE (0x3a) DW_TAG_base_type)
.byte 0x4 # DW_AT_byte_size
.byte 0x5 # DW_AT_encoding
.ascii "int\0" # DW_AT_name
.uleb128 0x4 # (DIE (0x41) DW_TAG_subprogram)
.ascii "bar\0" # DW_AT_name
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
.byte 0x1b # DW_AT_decl_line
# DW_AT_prototyped
.long 0x3a # DW_AT_type
.long .LFB1 # DW_AT_low_pc
.long .LFE1-.LFB1 # DW_AT_high_pc
.uleb128 0x1 # DW_AT_frame_base
.byte 0x9c # DW_OP_call_frame_cfa
# DW_AT_GNU_all_call_sites
.long 0x64 # DW_AT_sibling
.uleb128 0x5 # (DIE (0x5a) DW_TAG_GNU_call_site)
.long .LVL0 # DW_AT_low_pc
# DW_AT_GNU_tail_call
.long 0x25 # DW_AT_abstract_origin
.byte 0 # end of children of DIE 0x41
.uleb128 0x6 # (DIE (0x64) DW_TAG_subprogram)
.long .LASF0 # DW_AT_name: "foo_1"
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
.byte 0x21 # DW_AT_decl_line
# DW_AT_prototyped
.long 0x3a # DW_AT_type
.long .LFB2 # DW_AT_low_pc
.long .LFE2-.LFB2 # DW_AT_high_pc
.uleb128 0x1 # DW_AT_frame_base
.byte 0x9c # DW_OP_call_frame_cfa
# DW_AT_GNU_all_call_sites
.long 0x87 # DW_AT_sibling
.uleb128 0x5 # (DIE (0x7d) DW_TAG_GNU_call_site)
.long .LVL1 # DW_AT_low_pc
# DW_AT_GNU_tail_call
.long 0x41 # DW_AT_abstract_origin
.byte 0 # end of children of DIE 0x64
.uleb128 0x4 # (DIE (0x87) DW_TAG_subprogram)
.ascii "foo\0" # DW_AT_name
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
.byte 0x27 # DW_AT_decl_line
# DW_AT_prototyped
.long 0x3a # DW_AT_type
.long .LFB3 # DW_AT_low_pc
.long .LFE3-.LFB3 # DW_AT_high_pc
.uleb128 0x1 # DW_AT_frame_base
.byte 0x9c # DW_OP_call_frame_cfa
# DW_AT_GNU_all_call_sites
.long 0xaa # DW_AT_sibling
.uleb128 0x5 # (DIE (0xa0) DW_TAG_GNU_call_site)
.long .LVL2 # DW_AT_low_pc
# DW_AT_GNU_tail_call
.long 0x64 # DW_AT_abstract_origin
.byte 0 # end of children of DIE 0x87
.uleb128 0x7 # (DIE (0xaa) DW_TAG_subprogram)
# DW_AT_external
.long .LASF5 # DW_AT_name: "main"
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
.byte 0x2d # DW_AT_decl_line
# DW_AT_prototyped
.long 0x3a # DW_AT_type
.long .LFB4 # DW_AT_low_pc
.long .LFE4-.LFB4 # DW_AT_high_pc
.uleb128 0x1 # DW_AT_frame_base
.byte 0x9c # DW_OP_call_frame_cfa
# DW_AT_GNU_all_call_sites
.uleb128 0x8 # (DIE (0xbf) DW_TAG_variable)
.long .LASF6 # DW_AT_name: "answer"
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
.byte 0x2f # DW_AT_decl_line
.long 0x3a # DW_AT_type
.long .LLST0 # DW_AT_location
.uleb128 0x9 # (DIE (0xce) DW_TAG_GNU_call_site)
.long .LVL3 # DW_AT_low_pc
.long 0x87 # DW_AT_abstract_origin
.byte 0 # end of children of DIE 0xaa
.byte 0 # end of children of DIE 0xb
.section .debug_abbrev,"",@progbits
.Ldebug_abbrev0:
.uleb128 0x1 # (abbrev code)
.uleb128 0x11 # (TAG: DW_TAG_compile_unit)
.byte 0x1 # DW_children_yes
.uleb128 0x25 # (DW_AT_producer)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x13 # (DW_AT_language)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3 # (DW_AT_name)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x1b # (DW_AT_comp_dir)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x55 # (DW_AT_ranges)
.uleb128 0x17 # (DW_FORM_sec_offset)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x10 # (DW_AT_stmt_list)
.uleb128 0x17 # (DW_FORM_sec_offset)
.byte 0
.byte 0
.uleb128 0x2 # (abbrev code)
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
.byte 0 # DW_children_no
.uleb128 0x3 # (DW_AT_name)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x27 # (DW_AT_prototyped)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x12 # (DW_AT_high_pc)
.uleb128 0x6 # (DW_FORM_data4)
.uleb128 0x40 # (DW_AT_frame_base)
.uleb128 0x18 # (DW_FORM_exprloc)
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
.uleb128 0x19 # (DW_FORM_flag_present)
.byte 0
.byte 0
.uleb128 0x3 # (abbrev code)
.uleb128 0x24 # (TAG: DW_TAG_base_type)
.byte 0 # DW_children_no
.uleb128 0xb # (DW_AT_byte_size)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3e # (DW_AT_encoding)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3 # (DW_AT_name)
.uleb128 0x8 # (DW_FORM_string)
.byte 0
.byte 0
.uleb128 0x4 # (abbrev code)
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
.byte 0x1 # DW_children_yes
.uleb128 0x3 # (DW_AT_name)
.uleb128 0x8 # (DW_FORM_string)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x27 # (DW_AT_prototyped)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x12 # (DW_AT_high_pc)
.uleb128 0x6 # (DW_FORM_data4)
.uleb128 0x40 # (DW_AT_frame_base)
.uleb128 0x18 # (DW_FORM_exprloc)
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x1 # (DW_AT_sibling)
.uleb128 0x13 # (DW_FORM_ref4)
.byte 0
.byte 0
.uleb128 0x5 # (abbrev code)
.uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
.byte 0 # DW_children_no
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x2115 # (DW_AT_GNU_tail_call)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x31 # (DW_AT_abstract_origin)
.uleb128 0x13 # (DW_FORM_ref4)
.byte 0
.byte 0
.uleb128 0x6 # (abbrev code)
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
.byte 0x1 # DW_children_yes
.uleb128 0x3 # (DW_AT_name)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x27 # (DW_AT_prototyped)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x12 # (DW_AT_high_pc)
.uleb128 0x6 # (DW_FORM_data4)
.uleb128 0x40 # (DW_AT_frame_base)
.uleb128 0x18 # (DW_FORM_exprloc)
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x1 # (DW_AT_sibling)
.uleb128 0x13 # (DW_FORM_ref4)
.byte 0
.byte 0
.uleb128 0x7 # (abbrev code)
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
.byte 0x1 # DW_children_yes
.uleb128 0x3f # (DW_AT_external)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x3 # (DW_AT_name)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x27 # (DW_AT_prototyped)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x12 # (DW_AT_high_pc)
.uleb128 0x6 # (DW_FORM_data4)
.uleb128 0x40 # (DW_AT_frame_base)
.uleb128 0x18 # (DW_FORM_exprloc)
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
.uleb128 0x19 # (DW_FORM_flag_present)
.byte 0
.byte 0
.uleb128 0x8 # (abbrev code)
.uleb128 0x34 # (TAG: DW_TAG_variable)
.byte 0 # DW_children_no
.uleb128 0x3 # (DW_AT_name)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x2 # (DW_AT_location)
.uleb128 0x17 # (DW_FORM_sec_offset)
.byte 0
.byte 0
.uleb128 0x9 # (abbrev code)
.uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
.byte 0 # DW_children_no
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x31 # (DW_AT_abstract_origin)
.uleb128 0x13 # (DW_FORM_ref4)
.byte 0
.byte 0
.byte 0
.section .debug_loc,"",@progbits
.Ldebug_loc0:
.LLST0:
.long .LVL3 # Location list begin address (*.LLST0)
.long .LVL4 # Location list end address (*.LLST0)
.value 0x3 # Location expression size
.byte 0x70 # DW_OP_breg0
.sleb128 1
.byte 0x9f # DW_OP_stack_value
.long .LVL4 # Location list begin address (*.LLST0)
.long .LFE4 # Location list end address (*.LLST0)
.value 0x1 # Location expression size
.byte 0x50 # DW_OP_reg0
.long 0 # Location list terminator begin (*.LLST0)
.long 0 # Location list terminator end (*.LLST0)
.section .debug_aranges,"",@progbits
.long 0x24 # Length of Address Ranges Info
.value 0x2 # DWARF Version
.long .Ldebug_info0 # Offset of Compilation Unit Info
.byte 0x4 # Size of Address
.byte 0 # Size of Segment Descriptor
.value 0 # Pad to 8 byte boundary
.value 0
.long .Ltext0 # Address
.long .Letext0-.Ltext0 # Length
.long .LFB4 # Address
.long .LFE4-.LFB4 # Length
.long 0
.long 0
.section .debug_ranges,"",@progbits
.Ldebug_ranges0:
.long .Ltext0 # Offset 0
.long .Letext0
.long .LFB4 # Offset 0x8
.long .LFE4
.long 0
.long 0
.section .debug_line,"",@progbits
.Ldebug_line0:
.section .debug_str,"MS",@progbits,1
.LASF4:
.string "bar_1"
.LASF2:
.string "tailcall-only.c"
.LASF1:
.string "GNU C 4.8.3 20140911 (Red Hat 4.8.3-9) -m32 -march=i686 -g -O2"
.LASF6:
.string "answer"
.LASF5:
.string "main"
.LASF3:
.string ""
.LASF0:
.string "foo_1"
.ident "GCC: (GNU) 4.8.3 20140911 (Red Hat 4.8.3-9)"
.section .note.GNU-stack,"",@progbits