3666a04883
This commits the result of running gdb/copyright.py as per our Start
of New Year procedure...
gdb/ChangeLog
Update copyright year range in copyright header of all GDB files.
137 lines
2.5 KiB
ArmAsm
137 lines
2.5 KiB
ArmAsm
/* Copyright 2020-2021 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <asm/unistd.h>
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/* Define these for each architecture:
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1) RETURN_ADDRESS_REGNO: The register number representing the return
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address in the DWARF CFI. It can be easily be looked up using
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`readelf --debug-dump=frames-interp` on an existing binary of that
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architecture, where it says `ra=X`.
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2) exit_0: a sequence of instruction to execute the exit syscall with
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argument 0. */
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#if defined(__x86_64__)
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# define RETURN_ADDRESS_REGNO 16
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.macro exit_0
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mov $__NR_exit, %rax
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mov $0, %rdi
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syscall
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.endm
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#elif defined(__i386__)
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# define RETURN_ADDRESS_REGNO 8
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.macro exit_0
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mov $__NR_exit, %eax
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mov $0, %ebx
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int $0x80
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.endm
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#elif defined(__aarch64__)
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# define RETURN_ADDRESS_REGNO 30
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.macro exit_0
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mov x0, #0
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mov x8, #__NR_exit
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svc #0
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.endm
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#elif defined(__arm__)
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# define RETURN_ADDRESS_REGNO 14
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.macro exit_0
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ldr r7, =__NR_exit
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ldr r0, =0
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swi 0x0
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.endm
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#else
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# error "Unsupported architecture"
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#endif
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/* The following assembly program mimics this pseudo C program, where
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everything has been inlined:
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1 void bar(void) {
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2 nop;
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3 }
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4
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5 void foo(void) {
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6 nop;
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7 bar();
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8 nop;
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9 }
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10
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11 void _start(void) {
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12 nop;
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13 foo();
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14 nop;
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15 exit(0);
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16 }
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*/
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.global _start
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_start:
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.cfi_startproc
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/* State that the return address for this frame is undefined. */
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.cfi_undefined RETURN_ADDRESS_REGNO
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.global __cu_low_pc
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__cu_low_pc:
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.global __start_low_pc
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__start_low_pc:
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/* Line 12 */
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nop
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.global __foo_low_pc
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__foo_low_pc:
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/* Line 6 */
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nop
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.global __bar_low_pc
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__bar_low_pc:
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/* Line 2 */
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nop
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.global __bar_high_pc
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__bar_high_pc:
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/* Line 8 */
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nop
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.global __foo_high_pc
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__foo_high_pc:
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/* Line 14 */
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nop
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/* Line 15 */
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exit_0
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.cfi_endproc
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.global __start_high_pc
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__start_high_pc:
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.global __cu_high_pc
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__cu_high_pc:
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