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213516ef31
This commit is the result of running the gdb/copyright.py script, which automated the update of the copyright year range for all source files managed by the GDB project to be updated to include year 2023.
168 lines
3.1 KiB
ArmAsm
168 lines
3.1 KiB
ArmAsm
/* Copyright 2020-2023 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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#elif defined __powerpc64__
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# define RETURN_ADDRESS_REGNO 65
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.macro exit_0
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li 0, __NR_exit /* r0 - contains system call number */
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li 3, 0 /* r3 - contains first argument for sys call */
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sc
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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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#if defined __powerpc64__
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# if _CALL_ELF == 2
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.abiversion 2 /* Tell gdb what ELF version to use. */
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.global _start
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_start:
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# else
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.abiversion 1 /* Tell gdb what ELF version to use. */
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.align 2
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.global _start
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.section ".opd", "aw"
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.align 3
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_start:
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.quad ._start,.TOC.@tocbase,0
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.previous
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.type ._start,@function
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._start:
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# endif
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#else
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.global _start
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_start:
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#endif
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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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.section .note.GNU-stack,"",@progbits
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