2024-01-12 23:30:44 +08:00
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/* Copyright 2018-2024 Free Software Foundation, Inc.
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2023-12-02 00:27:37 +08:00
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This file is part of GDB.
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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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/* The difference between this and arm-pseudo-unwind is that here, the CFI
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directives use the obsolete DWARF number for the s16 register (a
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pseudo-register in GDB), whereas arm-pseudo-unwind uses the number for the d8
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register (the underlying raw register for s16). */
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.section .note.GNU-stack,"",%progbits
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.data
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value_callee:
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.quad 0x20212223
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value_caller:
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.quad 0x10111213
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.text
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.arm
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.global callee
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callee:
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.cfi_startproc
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/* Standard prologue. */
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push {fp, lr}
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.cfi_def_cfa fp, 4
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.cfi_offset fp, -8
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.cfi_offset lr, -4
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add fp, sp, #4
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/* Save caller's s16 value on the stack. */
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.cfi_offset 80, -12
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vpush {s16}
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/* Put our own s16 value. */
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ldr r0, =value_callee
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vldr s16, [r0]
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break_here_asm:
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/* Restore caller's s16 value. */
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vpop {s16}
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/* Standard epilogue. */
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pop {fp, pc}
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.cfi_endproc
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.global caller
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caller:
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.cfi_startproc
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/* Standard prologue. */
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push {fp, lr}
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.cfi_def_cfa fp, 4
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.cfi_offset fp, -8
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.cfi_offset lr, -4
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add fp, sp, #4
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/* Put our own s16 value. */
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ldr r0, =value_caller
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vldr s16, [r0]
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/* Call callee. */
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bl callee
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/* Store our s16 value in r0-r1 to return it. */
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vpush {s16}
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pop {r0}
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mov r1, #0
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/* Standard epilogue. */
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pop {fp, pc}
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.cfi_endproc
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