diff options
Diffstat (limited to 'arch/arm/lib/call_with_stack.S')
| -rw-r--r-- | arch/arm/lib/call_with_stack.S | 49 |
1 files changed, 28 insertions, 21 deletions
diff --git a/arch/arm/lib/call_with_stack.S b/arch/arm/lib/call_with_stack.S index 916c80f13ae7..5030d4e8d126 100644 --- a/arch/arm/lib/call_with_stack.S +++ b/arch/arm/lib/call_with_stack.S @@ -1,44 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ /* * arch/arm/lib/call_with_stack.S * * Copyright (C) 2011 ARM Ltd. * Written by Will Deacon <will.deacon@arm.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * 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, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/linkage.h> #include <asm/assembler.h> +#include <asm/unwind.h> /* * void call_with_stack(void (*fn)(void *), void *arg, void *sp) * * Change the stack to that pointed at by sp, then invoke fn(arg) with * the new stack. + * + * The sequence below follows the APCS frame convention for frame pointer + * unwinding, and implements the unwinder annotations needed by the EABI + * unwinder. */ -ENTRY(call_with_stack) - str sp, [r2, #-4]! - str lr, [r2, #-4]! +ENTRY(call_with_stack) +#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC) + mov ip, sp + push {fp, ip, lr, pc} + sub fp, ip, #4 +#else +UNWIND( .fnstart ) +UNWIND( .save {fpreg, lr} ) + push {fpreg, lr} +UNWIND( .setfp fpreg, sp ) + mov fpreg, sp +#endif mov sp, r2 mov r2, r0 mov r0, r1 - adr lr, BSYM(1f) - mov pc, r2 + bl_r r2 -1: ldr lr, [sp] - ldr sp, [sp, #4] - mov pc, lr +#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC) + ldmdb fp, {fp, sp, pc} +#else + mov sp, fpreg + pop {fpreg, pc} +UNWIND( .fnend ) +#endif + .globl call_with_stack_end +call_with_stack_end: ENDPROC(call_with_stack) |