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a7f0fda085
Porting PPC to libdw only needs an architecture-specific hook to move the register state from perf to libdw. The ARM and x86 architectures already use libdw, and it is useful to have as much common code for the unwinder as possible. Mark Wielaard has contributed a frame-based unwinder to libdw, so that unwinding works even for binaries that do not have CFI information. In addition, libunwind is always preferred to libdw by the build machinery so this cannot introduce regressions on machines that have both libunwind and libdw installed. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Milian Wolff <milian.wolff@kdab.com> Acked-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/1496312681-20133-1-git-send-email-pbonzini@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
#include <elfutils/libdwfl.h>
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#include "../../util/unwind-libdw.h"
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#include "../../util/perf_regs.h"
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#include "../../util/event.h"
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/* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils. */
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static const int special_regs[3][2] = {
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{ 65, PERF_REG_POWERPC_LINK },
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{ 101, PERF_REG_POWERPC_XER },
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{ 109, PERF_REG_POWERPC_CTR },
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};
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bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
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{
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struct unwind_info *ui = arg;
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struct regs_dump *user_regs = &ui->sample->user_regs;
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Dwarf_Word dwarf_regs[32], dwarf_nip;
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size_t i;
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#define REG(r) ({ \
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Dwarf_Word val = 0; \
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perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r); \
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val; \
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})
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dwarf_regs[0] = REG(R0);
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dwarf_regs[1] = REG(R1);
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dwarf_regs[2] = REG(R2);
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dwarf_regs[3] = REG(R3);
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dwarf_regs[4] = REG(R4);
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dwarf_regs[5] = REG(R5);
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dwarf_regs[6] = REG(R6);
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dwarf_regs[7] = REG(R7);
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dwarf_regs[8] = REG(R8);
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dwarf_regs[9] = REG(R9);
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dwarf_regs[10] = REG(R10);
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dwarf_regs[11] = REG(R11);
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dwarf_regs[12] = REG(R12);
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dwarf_regs[13] = REG(R13);
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dwarf_regs[14] = REG(R14);
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dwarf_regs[15] = REG(R15);
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dwarf_regs[16] = REG(R16);
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dwarf_regs[17] = REG(R17);
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dwarf_regs[18] = REG(R18);
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dwarf_regs[19] = REG(R19);
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dwarf_regs[20] = REG(R20);
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dwarf_regs[21] = REG(R21);
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dwarf_regs[22] = REG(R22);
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dwarf_regs[23] = REG(R23);
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dwarf_regs[24] = REG(R24);
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dwarf_regs[25] = REG(R25);
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dwarf_regs[26] = REG(R26);
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dwarf_regs[27] = REG(R27);
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dwarf_regs[28] = REG(R28);
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dwarf_regs[29] = REG(R29);
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dwarf_regs[30] = REG(R30);
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dwarf_regs[31] = REG(R31);
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if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs))
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return false;
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dwarf_nip = REG(NIP);
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dwfl_thread_state_register_pc(thread, dwarf_nip);
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for (i = 0; i < ARRAY_SIZE(special_regs); i++) {
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Dwarf_Word val = 0;
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perf_reg_value(&val, user_regs, special_regs[i][1]);
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if (!dwfl_thread_state_registers(thread,
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special_regs[i][0], 1,
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&val))
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return false;
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}
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return true;
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}
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