cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

unwind-libdw.c (2042B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <elfutils/libdwfl.h>
      3#include <linux/kernel.h>
      4#include "../../../util/unwind-libdw.h"
      5#include "../../../util/perf_regs.h"
      6#include "../../../util/event.h"
      7
      8/* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils.  */
      9static const int special_regs[3][2] = {
     10	{ 65, PERF_REG_POWERPC_LINK },
     11	{ 101, PERF_REG_POWERPC_XER },
     12	{ 109, PERF_REG_POWERPC_CTR },
     13};
     14
     15bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
     16{
     17	struct unwind_info *ui = arg;
     18	struct regs_dump *user_regs = &ui->sample->user_regs;
     19	Dwarf_Word dwarf_regs[32], dwarf_nip;
     20	size_t i;
     21
     22#define REG(r) ({						\
     23	Dwarf_Word val = 0;					\
     24	perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r);	\
     25	val;							\
     26})
     27
     28	dwarf_regs[0]  = REG(R0);
     29	dwarf_regs[1]  = REG(R1);
     30	dwarf_regs[2]  = REG(R2);
     31	dwarf_regs[3]  = REG(R3);
     32	dwarf_regs[4]  = REG(R4);
     33	dwarf_regs[5]  = REG(R5);
     34	dwarf_regs[6]  = REG(R6);
     35	dwarf_regs[7]  = REG(R7);
     36	dwarf_regs[8]  = REG(R8);
     37	dwarf_regs[9]  = REG(R9);
     38	dwarf_regs[10] = REG(R10);
     39	dwarf_regs[11] = REG(R11);
     40	dwarf_regs[12] = REG(R12);
     41	dwarf_regs[13] = REG(R13);
     42	dwarf_regs[14] = REG(R14);
     43	dwarf_regs[15] = REG(R15);
     44	dwarf_regs[16] = REG(R16);
     45	dwarf_regs[17] = REG(R17);
     46	dwarf_regs[18] = REG(R18);
     47	dwarf_regs[19] = REG(R19);
     48	dwarf_regs[20] = REG(R20);
     49	dwarf_regs[21] = REG(R21);
     50	dwarf_regs[22] = REG(R22);
     51	dwarf_regs[23] = REG(R23);
     52	dwarf_regs[24] = REG(R24);
     53	dwarf_regs[25] = REG(R25);
     54	dwarf_regs[26] = REG(R26);
     55	dwarf_regs[27] = REG(R27);
     56	dwarf_regs[28] = REG(R28);
     57	dwarf_regs[29] = REG(R29);
     58	dwarf_regs[30] = REG(R30);
     59	dwarf_regs[31] = REG(R31);
     60	if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs))
     61		return false;
     62
     63	dwarf_nip = REG(NIP);
     64	dwfl_thread_state_register_pc(thread, dwarf_nip);
     65	for (i = 0; i < ARRAY_SIZE(special_regs); i++) {
     66		Dwarf_Word val = 0;
     67		perf_reg_value(&val, user_regs, special_regs[i][1]);
     68		if (!dwfl_thread_state_registers(thread,
     69						 special_regs[i][0], 1,
     70						 &val))
     71			return false;
     72	}
     73
     74	return true;
     75}