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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ftrace_64_pg.S (1268B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Split from ftrace_64.S
      4 */
      5
      6#include <linux/magic.h>
      7#include <asm/ppc_asm.h>
      8#include <asm/asm-offsets.h>
      9#include <asm/ftrace.h>
     10#include <asm/ppc-opcode.h>
     11#include <asm/export.h>
     12
     13_GLOBAL_TOC(ftrace_caller)
     14	lbz	r3, PACA_FTRACE_ENABLED(r13)
     15	cmpdi	r3, 0
     16	beqlr
     17
     18	/* Taken from output of objdump from lib64/glibc */
     19	mflr	r3
     20	ld	r11, 0(r1)
     21	stdu	r1, -112(r1)
     22	std	r3, 128(r1)
     23	ld	r4, 16(r11)
     24	subi	r3, r3, MCOUNT_INSN_SIZE
     25.globl ftrace_call
     26ftrace_call:
     27	bl	ftrace_stub
     28	nop
     29#ifdef CONFIG_FUNCTION_GRAPH_TRACER
     30.globl ftrace_graph_call
     31ftrace_graph_call:
     32	b	ftrace_graph_stub
     33_GLOBAL(ftrace_graph_stub)
     34#endif
     35	ld	r0, 128(r1)
     36	mtlr	r0
     37	addi	r1, r1, 112
     38
     39_GLOBAL(ftrace_stub)
     40	blr
     41
     42#ifdef CONFIG_FUNCTION_GRAPH_TRACER
     43_GLOBAL(ftrace_graph_caller)
     44	addi	r5, r1, 112
     45	/* load r4 with local address */
     46	ld	r4, 128(r1)
     47	subi	r4, r4, MCOUNT_INSN_SIZE
     48
     49	/* Grab the LR out of the caller stack frame */
     50	ld	r11, 112(r1)
     51	ld	r3, 16(r11)
     52
     53	bl	prepare_ftrace_return
     54	nop
     55
     56	/*
     57	 * prepare_ftrace_return gives us the address we divert to.
     58	 * Change the LR in the callers stack frame to this.
     59	 */
     60	ld	r11, 112(r1)
     61	std	r3, 16(r11)
     62
     63	ld	r0, 128(r1)
     64	mtlr	r0
     65	addi	r1, r1, 112
     66	blr
     67#endif /* CONFIG_FUNCTION_GRAPH_TRACER */