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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stacktrace.h (2199B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_STACKTRACE_H
      3#define _ASM_STACKTRACE_H
      4
      5#include <asm/ptrace.h>
      6#include <asm/asm.h>
      7#include <linux/stringify.h>
      8
      9#ifdef CONFIG_KALLSYMS
     10extern int raw_show_trace;
     11extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
     12				  unsigned long pc, unsigned long *ra);
     13extern unsigned long unwind_stack_by_address(unsigned long stack_page,
     14					     unsigned long *sp,
     15					     unsigned long pc,
     16					     unsigned long *ra);
     17#else
     18#define raw_show_trace 1
     19static inline unsigned long unwind_stack(struct task_struct *task,
     20	unsigned long *sp, unsigned long pc, unsigned long *ra)
     21{
     22	return 0;
     23}
     24#endif
     25
     26#define STR_PTR_LA    __stringify(PTR_LA)
     27#define STR_LONG_S    __stringify(LONG_S)
     28#define STR_LONG_L    __stringify(LONG_L)
     29#define STR_LONGSIZE  __stringify(LONGSIZE)
     30
     31#define STORE_ONE_REG(r) \
     32    STR_LONG_S   " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t"
     33
     34static __always_inline void prepare_frametrace(struct pt_regs *regs)
     35{
     36#ifndef CONFIG_KALLSYMS
     37	/*
     38	 * Remove any garbage that may be in regs (specially func
     39	 * addresses) to avoid show_raw_backtrace() to report them
     40	 */
     41	memset(regs, 0, sizeof(*regs));
     42#endif
     43	__asm__ __volatile__(
     44		".set push\n\t"
     45		".set noat\n\t"
     46		/* Store $1 so we can use it */
     47		STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t"
     48		/* Store the PC */
     49		"1: " STR_PTR_LA " $1, 1b\n\t"
     50		STR_LONG_S " $1,%0\n\t"
     51		STORE_ONE_REG(2)
     52		STORE_ONE_REG(3)
     53		STORE_ONE_REG(4)
     54		STORE_ONE_REG(5)
     55		STORE_ONE_REG(6)
     56		STORE_ONE_REG(7)
     57		STORE_ONE_REG(8)
     58		STORE_ONE_REG(9)
     59		STORE_ONE_REG(10)
     60		STORE_ONE_REG(11)
     61		STORE_ONE_REG(12)
     62		STORE_ONE_REG(13)
     63		STORE_ONE_REG(14)
     64		STORE_ONE_REG(15)
     65		STORE_ONE_REG(16)
     66		STORE_ONE_REG(17)
     67		STORE_ONE_REG(18)
     68		STORE_ONE_REG(19)
     69		STORE_ONE_REG(20)
     70		STORE_ONE_REG(21)
     71		STORE_ONE_REG(22)
     72		STORE_ONE_REG(23)
     73		STORE_ONE_REG(24)
     74		STORE_ONE_REG(25)
     75		STORE_ONE_REG(26)
     76		STORE_ONE_REG(27)
     77		STORE_ONE_REG(28)
     78		STORE_ONE_REG(29)
     79		STORE_ONE_REG(30)
     80		STORE_ONE_REG(31)
     81		/* Restore $1 */
     82		STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t"
     83		".set pop\n\t"
     84		: "=m" (regs->cp0_epc)
     85		: "r" (regs->regs)
     86		: "memory");
     87}
     88
     89#endif /* _ASM_STACKTRACE_H */