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// SPDX-License-Identifier: GPL-2.0
#include <elfutils/libdwfl.h>
#include <linux/kernel.h>
#include "../../../util/unwind-libdw.h"
#include "../../../util/perf_regs.h"
#include "../../../util/event.h"
/* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils. */
static const int special_regs[3][2] = {
{ 65, PERF_REG_POWERPC_LINK },
{ 101, PERF_REG_POWERPC_XER },
{ 109, PERF_REG_POWERPC_CTR },
};
bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
{
struct unwind_info *ui = arg;
struct regs_dump *user_regs = &ui->sample->user_regs;
Dwarf_Word dwarf_regs[32], dwarf_nip;
size_t i;
#define REG(r) ({ \
Dwarf_Word val = 0; \
perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r); \
val; \
})
dwarf_regs[0] = REG(R0);
dwarf_regs[1] = REG(R1);
dwarf_regs[2] = REG(R2);
dwarf_regs[3] = REG(R3);
dwarf_regs[4] = REG(R4);
dwarf_regs[5] = REG(R5);
dwarf_regs[6] = REG(R6);
dwarf_regs[7] = REG(R7);
dwarf_regs[8] = REG(R8);
dwarf_regs[9] = REG(R9);
dwarf_regs[10] = REG(R10);
dwarf_regs[11] = REG(R11);
dwarf_regs[12] = REG(R12);
dwarf_regs[13] = REG(R13);
dwarf_regs[14] = REG(R14);
dwarf_regs[15] = REG(R15);
dwarf_regs[16] = REG(R16);
dwarf_regs[17] = REG(R17);
dwarf_regs[18] = REG(R18);
dwarf_regs[19] = REG(R19);
dwarf_regs[20] = REG(R20);
dwarf_regs[21] = REG(R21);
dwarf_regs[22] = REG(R22);
dwarf_regs[23] = REG(R23);
dwarf_regs[24] = REG(R24);
dwarf_regs[25] = REG(R25);
dwarf_regs[26] = REG(R26);
dwarf_regs[27] = REG(R27);
dwarf_regs[28] = REG(R28);
dwarf_regs[29] = REG(R29);
dwarf_regs[30] = REG(R30);
dwarf_regs[31] = REG(R31);
if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs))
return false;
dwarf_nip = REG(NIP);
dwfl_thread_state_register_pc(thread, dwarf_nip);
for (i = 0; i < ARRAY_SIZE(special_regs); i++) {
Dwarf_Word val = 0;
perf_reg_value(&val, user_regs, special_regs[i][1]);
if (!dwfl_thread_state_registers(thread,
special_regs[i][0], 1,
&val))
return false;
}
return true;
}
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