cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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call_with_stack.S (1074B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * arch/arm/lib/call_with_stack.S
      4 *
      5 * Copyright (C) 2011 ARM Ltd.
      6 * Written by Will Deacon <will.deacon@arm.com>
      7 */
      8
      9#include <linux/linkage.h>
     10#include <asm/assembler.h>
     11#include <asm/unwind.h>
     12
     13/*
     14 * void call_with_stack(void (*fn)(void *), void *arg, void *sp)
     15 *
     16 * Change the stack to that pointed at by sp, then invoke fn(arg) with
     17 * the new stack.
     18 *
     19 * The sequence below follows the APCS frame convention for frame pointer
     20 * unwinding, and implements the unwinder annotations needed by the EABI
     21 * unwinder.
     22 */
     23
     24ENTRY(call_with_stack)
     25#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)
     26	mov	ip, sp
     27	push	{fp, ip, lr, pc}
     28	sub	fp, ip, #4
     29#else
     30UNWIND( .fnstart		)
     31UNWIND( .save	{fpreg, lr}	)
     32	push	{fpreg, lr}
     33UNWIND( .setfp	fpreg, sp	)
     34	mov	fpreg, sp
     35#endif
     36	mov	sp, r2
     37	mov	r2, r0
     38	mov	r0, r1
     39
     40	bl_r	r2
     41
     42#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC)
     43	ldmdb	fp, {fp, sp, pc}
     44#else
     45	mov	sp, fpreg
     46	pop	{fpreg, pc}
     47UNWIND( .fnend			)
     48#endif
     49ENDPROC(call_with_stack)