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|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2012-2016 Free Software Foundation, 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 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/>. */
/* Test the behaviour of gdb in the following situation, the dwarf debug
information describes a parameter as being in a register but a more
recent (inner) frame marks the register as being undefined.
This can arrise if the dwarf producer has the location of a parameter in
a callee clobbered register at the time of a call. Older versions of
gcc used to do this, newer versions seem to avoid this issue.
Though it could be argued that such dwarf is incorrect, we would still
like gdb to behave in a user friendly, and helpful way when presented
with such dwarf. */
/* There are 4 test cases in this assembler file. In each case funcion
main calls each test function in turn, each test case then calls the
breakpt function.
We don't actually pass any parameters around, we don't need to, instead
the dwarf for each test function declares that the function has some
parameters, and tells us which registers these parameters are in. The
breakpt function marks some of these registers as undefined. The main
function helpfully places some marker values into all the registers that
are used as parameters so we can see if they ever get printed.
We use gdb to break in the breakpt function for each of the 4 test
cases, and then backtrace through the test function back to main. In
each case some or all of the parameters to the test function should be
marked as optimized out, due to the breakpt function effectively
clobbering them.
The dwarf register numbering is different to the gdb register number.
In some of the tests we rely on gdb behaviour of being able to specify a
struct using a single register location, the structure will then "flow"
into the next gdb register. The initial register is specified using a
dwarf register number, but the "next" register will depend on gdb
register ordering.
Exposing this internal gdb register numbering is really a gdb bug, the
functionality for selecting the "next" register should be moved into
target dependent code (such as AVR). Right now we work around this
bug in this test; if the bug is ever fixed this test is going to need
some tweaking.
The breakpt function always marks rcx, rsi, and rdi as undefined.
register | dwarf | gdb | |
name | reg # | reg # | breakpt |
----------|-------|-------|---------|
rdx | 1 | 3 | |
rcx | 2 | 2 | undef |
rbx | 3 | 1 | |
rsi | 4 | 4 | undef |
rdi | 5 | 5 | undef |
We declare the test parameters to be in the register rdx, rcx, rbx, rsi,
and rdi. Of these, rdx and rbx are not traditionally used for parameter
passing, but that really doesn't matter for this test.
int_param_single_reg_loc: Passes 8-byte integer parameters in 8-byte
registers using DW_OP_regn style location
information. The parameters are placed as
follows, operand0 (rcx), operand1 (rbx),
operand2 (rsi). We expect operand0 and
operand2 to be marked as optimised out, but
operand1 to be valid.
struct_param_single_reg_loc: Passes 16-byte structures in two 8-byte
registers using dwarf DW_OP_regn location
information to describe a single register,
gdb will assume that the structure flows
into the next sequential register. The
parameters are placed as follows, operand0
(rbx/rcx), operand1 (rcx/rdx), and operand2
(rsi/rdi). The reuse of rcx between
operand0 and operand1 is intentional.
struct_param_two_reg_pieces: Passes 16-byte structure in two 8-byte
registers using dwarf DW_OP_piece based
location information to describe both
registers. The parameters are placed as
follows, operand0 (rdx/rcx), operand1
(rcx/rbx), and operand2 (rsi/rdi). The
reuse of rcx between operand0 and operand1
is intentional.
int_param_two_reg_pieces: Passes 8-byte integer values in two 8-byte
registers with 4-bytes being placed in each
register, using dwarf DW_OP_piece based
location information to describe how the
parameters are split up.The parameters are
placed as follows, operand0 (rdx/rcx),
operand1 (rcx/rbx), and operand2 (rsi/rdi).
The reuse of rcx between operand0 and operand1
is intentional.
*/
.text
.Ltext0:
/* main */
.globl main
.type main, @function
main:
.Ltext1:
sub $0x8,%rsp
.Ltext2:
movq $0xdeadbe00deadbe01, %rbx
movq $0xdeadbe02deadbe03, %rcx
movq $0xdeadbe04deadbe05, %rdx
movq $0xdeadbe06deadbe07, %rsi
movq $0xdeadbe08deadbe09, %rdi
callq int_param_single_reg_loc
nop
callq struct_param_single_reg_loc
nop
callq struct_param_two_reg_pieces
nop
callq int_param_two_reg_pieces
nop
add $0x8,%rsp
retq
.Ltext3:
.size main, .-main
/* breakpt */
.globl breakpt
.type breakpt, @function
breakpt:
.Ltext4:
sub $0x8,%rsp
add $0x8, %rsp
retq
.Ltext5:
.size breakpt, .-breakpt
/* int_param_single_reg_loc */
.globl int_param_single_reg_loc
.type int_param_single_reg_loc, @function
int_param_single_reg_loc:
.Ltext5:
sub $0x8,%rsp
.Ltext6:
nop
callq breakpt
nop
add $0x8,%rsp
retq
.Ltext7:
.size int_param_single_reg_loc, .-int_param_single_reg_loc
/* struct_param_single_reg_loc */
.globl struct_param_single_reg_loc
.type struct_param_single_reg_loc, @function
struct_param_single_reg_loc:
.Ltext8:
sub $0x8,%rsp
.Ltext9:
nop
callq breakpt
nop
add $0x8,%rsp
retq
.Ltext10:
.size struct_param_single_reg_loc, .-struct_param_single_reg_loc
/* struct_param_two_reg_pieces */
.globl struct_param_two_reg_pieces
.type struct_param_two_reg_pieces, @function
struct_param_two_reg_pieces:
.Ltext11:
sub $0x8,%rsp
.Ltext12:
nop
callq breakpt
nop
add $0x8,%rsp
retq
.Ltext13:
.size struct_param_two_reg_pieces, .-struct_param_two_reg_pieces
/* int_param_two_reg_pieces */
.globl int_param_two_reg_pieces
.type int_param_two_reg_pieces, @function
int_param_two_reg_pieces:
.Ltext14:
sub $0x8,%rsp
.Ltext15:
nop
callq breakpt
nop
add $0x8,%rsp
retq
.Ltext16:
.size int_param_two_reg_pieces, .-int_param_two_reg_pieces
.Letext0:
/*******************************************************/
.section .debug_frame,"",@progbits
/* CIE */
.Lframe0:
.long .LECIE0-.LSCIE0 /* length */
.LSCIE0:
.long 0xffffffff /* CIE_id */
.byte 0x1 /* version */
.string "" /* augmentation */
.uleb128 0x1 /* code alignment */
.sleb128 -8 /* data alignment */
.byte 0x10 /* R/A column */
/* Initial instructions */
.byte 0xc /* DW_CFA_def_cfa */
.uleb128 0x7 /* reg# */
.uleb128 0x8 /* offset */
.byte 0x90 /* DW_CFA_offset (r16) */
.uleb128 0x1 /* offset */
.align 8
.LECIE0:
/* FDE : breakpt */
.LSFDE0:
.long .LEFDE0-.LASFDE0 /* length */
.LASFDE0:
.long .Lframe0 /* CIE reference */
.quad .Ltext4 /* start */
.quad .Ltext5-.Ltext4 /* length */
/* Instructions */
.byte 0x7 /* DW_CFA_undefined */
.uleb128 0x2 /* reg# */
.byte 0x7 /* DW_CFA_undefined */
.uleb128 0x4 /* reg# */
.byte 0x7 /* DW_CFA_undefined */
.uleb128 0x5 /* reg# */
.align 8
.LEFDE0:
/* FDE : int_param_single_reg_loc */
.LSFDE2:
.long .LEFDE2-.LASFDE2 /* length */
.LASFDE2:
.long .Lframe0 /* CIE reference */
.quad .Ltext5 /* start */
.quad .Ltext7-.Ltext5 /* length */
/* Instructions */
.byte 0x4
.long .Ltext6-.Ltext5
.byte 0xe
.uleb128 0x10
.align 8
.LEFDE2:
/* FDE : struct_param_single_reg_loc */
.LSFDE3:
.long .LEFDE3-.LASFDE3 /* length */
.LASFDE3:
.long .Lframe0 /* CIE reference */
.quad .Ltext8 /* start */
.quad .Ltext10-.Ltext8 /* length */
/* Instructions */
.byte 0x4
.long .Ltext9-.Ltext8
.byte 0xe
.uleb128 0x10
.align 8
.LEFDE3:
/* FDE : struct_param_two_reg_pieces */
.LSFDE4:
.long .LEFDE4-.LASFDE4 /* length */
.LASFDE4:
.long .Lframe0 /* CIE reference */
.quad .Ltext11 /* start */
.quad .Ltext13-.Ltext11 /* length */
/* Instructions */
.byte 0x4
.long .Ltext12-.Ltext11
.byte 0xe
.uleb128 0x10
.align 8
.LEFDE4:
/* FDE : int_param_two_reg_pieces */
.LSFDE5:
.long .LEFDE5-.LASFDE5 /* length */
.LASFDE5:
.long .Lframe0 /* CIE reference */
.quad .Ltext14 /* start */
.quad .Ltext16-.Ltext14 /* length */
/* Instructions */
.byte 0x4
.long .Ltext15-.Ltext14
.byte 0xe
.uleb128 0x10
.align 8
.LEFDE5:
/* FDE : main */
.LSFDE9:
.long .LEFDE9-.LASFDE9 /* length */
.LASFDE9:
.long .Lframe0 /* CIE reference */
.quad .Ltext1 /* start */
.quad .Ltext3-.Ltext1 /* length */
/* Instructions */
.byte 0x4
.long .Ltext2-.Ltext1
.byte 0xe
.uleb128 0x10
.align 8
.LEFDE9:
/*******************************************************/
.section .debug_info,"",@progbits
.Ldebug_info0:
.long .Ldebug_info_end - .Ldebug_info_start /* Length */
.Ldebug_info_start:
.value 0x2 /* DWARF version number. */
.long .Ldebug_abbrev0 /* Offset into .debug_abbrev */
.byte 0x8 /* Pointer size */
.LDI0:
.uleb128 0x1 /* DW_TAG_compile_unit */
.string "GNU C 4.2.1" /* DW_AT_producer */
.byte 0x1 /* DW_AT_language */
.quad .Ltext0 /* DW_AT_low_pc */
.quad .Letext0 /* DW_AT_high_pc */
.LDI1:
.uleb128 0x2 /* DW_TAG_subprogram */
.byte 0x1 /* DW_AT_external */
.string "breakpt" /* DW_AT_name */
.byte 0x1 /* DW_AT_prototyped */
.quad .Ltext4 /* DW_AT_low_pc */
.quad .Ltext5 /* DW_AT_high_pc */
.LDI2:
.uleb128 0x5 /* DW_TAG_base_type */
.byte 0x8 /* DW_AT_byte_size */
.byte 0x5 /* DW_AT_encoding (DW_ATE_signed) */
.string "long int" /* DW_AT_name */
.LDI3:
.uleb128 0x7 /* DW_TAG_structure_type */
.string "big" /* DW_AT_name */
.byte 0x10 /* DW_AT_byte_size */
.long .LDI6 - .Ldebug_info0 /* DW_AT_sibling */
.LDI4:
.uleb128 0x8 /* DW_TAG_member */
.string "a" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.byte 0x2 /* DW_AT_data_member_location : length */
.byte 0x23 /* DW_OP_plus_uconst */
.uleb128 0x0 /* + 0 */
.LDI5:
.uleb128 0x8 /* DW_TAG_member */
.string "b" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.byte 0x2 /* DW_AT_data_member_location : length */
.byte 0x23 /* DW_OP_plus_uconst */
.uleb128 0x8 /* + 8 */
.byte 0x0
.LDI6:
.uleb128 0x6 /* DW_TAG_subprogram */
.byte 0x1 /* DW_AT_external */
.string "main" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.quad .Ltext1 /* DW_AT_low_pc */
.quad .Ltext3 /* DW_AT_high_pc */
.LDI7:
.uleb128 0x3 /* DW_TAG_subprogram */
.byte 0x1 /* DW_AT_external */
.string "int_param_single_reg_loc" /* DW_AT_name */
.byte 0x1 /* DW_AT_prototyped */
.quad .Ltext5 /* DW_AT_low_pc */
.quad .Ltext7 /* DW_AT_high_pc */
.long .LDI11 - .Ldebug_info0 /* DW_AT_sibling */
.LDI8:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand0" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.byte 1 /* DW_AT_location : length */
.byte 0x52 /* DW_OP_reg2 */
.LDI9:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand1" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.byte 1 /* DW_AT_location : length */
.byte 0x53 /* DW_OP_reg3 */
.LDI10:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand2" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.byte 1 /* DW_AT_location : length */
.byte 0x54 /* DW_OP_reg4 */
.byte 0x0
.LDI11:
.uleb128 0x3 /* DW_TAG_subprogram */
.byte 0x1 /* DW_AT_external */
.string "struct_param_single_reg_loc" /* DW_AT_name */
.byte 0x1 /* DW_AT_prototyped */
.quad .Ltext8 /* DW_AT_low_pc */
.quad .Ltext10 /* DW_AT_high_pc */
.long .LDI15 - .Ldebug_info0 /* DW_AT_sibling */
.LDI12:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand0" /* DW_AT_name */
.long .LDI3 - .Ldebug_info0 /* DW_AT_type */
.byte 1 /* DW_AT_location : length */
.byte 0x53 /* DW_OP_reg3 */
.LDI13:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand1" /* DW_AT_name */
.long .LDI3 - .Ldebug_info0 /* DW_AT_type */
.byte 1 /* DW_AT_location : length */
.byte 0x52 /* DW_OP_reg2 */
.LDI14:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand2" /* DW_AT_name */
.long .LDI3 - .Ldebug_info0 /* DW_AT_type */
.byte 1 /* DW_AT_location : length */
.byte 0x54 /* DW_OP_reg4 */
.byte 0x0
.LDI15:
.uleb128 0x3 /* DW_TAG_subprogram */
.byte 0x1 /* DW_AT_external */
.string "struct_param_two_reg_pieces" /* DW_AT_name */
.byte 0x1 /* DW_AT_prototyped */
.quad .Ltext11 /* DW_AT_low_pc */
.quad .Ltext13 /* DW_AT_high_pc */
.long .LDI19 - .Ldebug_info0 /* DW_AT_sibling */
.LDI16:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand0" /* DW_AT_name */
.long .LDI3 - .Ldebug_info0 /* DW_AT_type */
.byte 6 /* DW_AT_location : length */
.byte 0x51 /* DW_OP_reg1 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x8 /* 8 bytes */
.byte 0x52 /* DW_OP_reg2 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x8 /* 8 bytes */
.LDI17:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand1" /* DW_AT_name */
.long .LDI3 - .Ldebug_info0 /* DW_AT_type */
.byte 6 /* DW_AT_location : length */
.byte 0x52 /* DW_OP_reg2 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x8 /* 8 bytes */
.byte 0x53 /* DW_OP_reg3 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x8 /* 8 bytes */
.LDI18:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand2" /* DW_AT_name */
.long .LDI3 - .Ldebug_info0 /* DW_AT_type */
.byte 6 /* DW_AT_location : length */
.byte 0x54 /* DW_OP_reg4 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x8 /* 8 bytes */
.byte 0x55 /* DW_OP_reg5 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x8 /* 8 bytes */
.byte 0x0
.LDI19:
.uleb128 0x3 /* DW_TAG_subprogram */
.byte 0x1 /* DW_AT_external */
.string "int_param_two_reg_pieces" /* DW_AT_name */
.byte 0x1 /* DW_AT_prototyped */
.quad .Ltext14 /* DW_AT_low_pc */
.quad .Ltext16 /* DW_AT_high_pc */
.long .LDIE0 - .Ldebug_info0 /* DW_AT_sibling */
.LDI20:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand0" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.byte 6 /* DW_AT_location : length */
.byte 0x51 /* DW_OP_reg1 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x4 /* 4 bytes */
.byte 0x52 /* DW_OP_reg2 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x4 /* 4 bytes */
.LDI21:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand1" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.byte 6 /* DW_AT_location : length */
.byte 0x52 /* DW_OP_reg2 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x4 /* 4 bytes */
.byte 0x53 /* DW_OP_reg3 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x4 /* 4 bytes */
.LDI22:
.uleb128 0x4 /* DW_TAG_formal_parameter */
.string "operand2" /* DW_AT_name */
.long .LDI2 - .Ldebug_info0 /* DW_AT_type */
.byte 6 /* DW_AT_location : length */
.byte 0x54 /* DW_OP_reg4 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x4 /* 4 bytes */
.byte 0x55 /* DW_OP_reg5 */
.byte 0x93 /* DW_OP_piece */
.uleb128 0x4 /* 4 bytes */
.byte 0x0
.LDIE0:
.byte 0x0
.Ldebug_info_end:
/*******************************************************/
.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 0x8 /* DW_FORM_string */
.uleb128 0x13 /* DW_AT_language */
.uleb128 0xb /* DW_FORM_data1 */
.uleb128 0x11 /* DW_AT_low_pc */
.uleb128 0x1 /* DW_FORM_addr */
.uleb128 0x12 /* DW_AT_high_pc */
.uleb128 0x1 /* DW_FORM_addr */
.byte 0x0
.byte 0x0
.uleb128 0x2 /* abbrev code */
.uleb128 0x2e /* TAG: DW_TAG_subprogram */
.byte 0x0 /* DW_CHILDREN_no */
.uleb128 0x3f /* DW_AT_external */
.uleb128 0xc /* DW_FORM_flag */
.uleb128 0x3 /* DW_AT_name */
.uleb128 0x8 /* DW_FORM_string */
.uleb128 0x27 /* DW_AT_prototyped */
.uleb128 0xc /* DW_FORM_flag*/
.uleb128 0x11 /* DW_AT_low_pc */
.uleb128 0x1 /* DW_FORM_addr */
.uleb128 0x12 /* DW_AT_high_pc */
.uleb128 0x1 /* DW_FORM_addr */
.byte 0x0
.byte 0x0
.uleb128 0x3 /* abbrev code */
.uleb128 0x2e /* TAG: DW_TAG_subprogram */
.byte 0x1 /* DW_CHILDREN_yes */
.uleb128 0x3f /* DW_AT_external */
.uleb128 0xc /* DW_FORM_flag */
.uleb128 0x3 /* DW_AT_name */
.uleb128 0x8 /* DW_FORM_string */
.uleb128 0x27 /* DW_AT_prototyped */
.uleb128 0xc /* DW_FORM_flag*/
.uleb128 0x11 /* DW_AT_low_pc */
.uleb128 0x1 /* DW_FORM_addr */
.uleb128 0x12 /* DW_AT_high_pc */
.uleb128 0x1 /* DW_FORM_addr */
.uleb128 0x1 /* DW_AT_sibling */
.uleb128 0x13 /* DW_FORM_ref4 */
.byte 0x0
.byte 0x0
.uleb128 0x4 /* abbrev code */
.uleb128 0x5 /* TAG: DW_TAG_formal_parameter */
.byte 0x0 /* DW_CHILDREN_no */
.uleb128 0x3 /* DW_AT_name */
.uleb128 0x8 /* DW_FORM_string */
.uleb128 0x49 /* DW_AT_type */
.uleb128 0x13 /* DW_FORM_ref4 */
.uleb128 0x2 /* DW_AT_location */
.uleb128 0xa /* DW_FORM_block1 */
.byte 0x0
.byte 0x0
.uleb128 0x5 /* abbrev code */
.uleb128 0x24 /* TAG: DW_TAG_base_type */
.byte 0x0 /* 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 0x0
.byte 0x0
.uleb128 0x6 /* abbrev code */
.uleb128 0x2e /* TAG: DW_TAG_subprogram */
.byte 0x0 /* DW_CHILDREN_no */
.uleb128 0x3f /* DW_AT_external */
.uleb128 0xc /* DW_FORM_flag */
.uleb128 0x3 /* DW_AT_name */
.uleb128 0x8 /* DW_FORM_string */
.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 0x1 /* DW_FORM_addr */
.byte 0x0
.byte 0x0
.uleb128 0x7 /* abbrev code */
.uleb128 0x13 /* DW_TAG_structure_type */
.byte 0x1 /* DW_CHILDREN_yes */
.uleb128 0x3 /* DW_AT_name */
.uleb128 0x8 /* DW_FORM_string */
.uleb128 0xb /* DW_AT_byte_size */
.uleb128 0xb /* DW_FORM_data1 */
.uleb128 0x1 /* DW_AT_sibling */
.uleb128 0x13 /* DW_FORM_ref4 */
.byte 0x0
.byte 0x0
.uleb128 0x8 /* abbrev code */
.uleb128 0xd /* DW_TAG_member */
.byte 0x0 /* DW_children_no */
.uleb128 0x3 /* DW_AT_name */
.uleb128 0x8 /* DW_FORM_string */
.uleb128 0x49 /* DW_AT_type */
.uleb128 0x13 /* DW_FORM_ref4 */
.uleb128 0x38 /* DW_AT_data_member_location */
.uleb128 0xa /* DW_FORM_block1 */
.byte 0x0
.byte 0x0
.byte 0x0
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