744e9a91cf
Based on prior work: https://lkml.org/lkml/2014/5/6/395 and on how other arches add libdw unwind support. Includes support for running the unwind test, e.g., on a system with only elfutils' libdw 0.170, the test now runs, and successfully: $ ./perf test unwind 56: Test dwarf unwind : Ok Originally-by: Jean Pihet <jean.pihet@linaro.org> Reported-by: Christian Hansen <chansen3@cisco.com> Signed-off-by: Kim Phillips <kim.phillips@arm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180308211030.4ee4a0d6ff6dc5cda1b567d4@arm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#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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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[PERF_REG_ARM64_MAX], dwarf_pc;
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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_ARM64_##r); \
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val; \
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})
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dwarf_regs[0] = REG(X0);
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dwarf_regs[1] = REG(X1);
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dwarf_regs[2] = REG(X2);
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dwarf_regs[3] = REG(X3);
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dwarf_regs[4] = REG(X4);
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dwarf_regs[5] = REG(X5);
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dwarf_regs[6] = REG(X6);
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dwarf_regs[7] = REG(X7);
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dwarf_regs[8] = REG(X8);
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dwarf_regs[9] = REG(X9);
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dwarf_regs[10] = REG(X10);
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dwarf_regs[11] = REG(X11);
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dwarf_regs[12] = REG(X12);
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dwarf_regs[13] = REG(X13);
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dwarf_regs[14] = REG(X14);
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dwarf_regs[15] = REG(X15);
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dwarf_regs[16] = REG(X16);
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dwarf_regs[17] = REG(X17);
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dwarf_regs[18] = REG(X18);
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dwarf_regs[19] = REG(X19);
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dwarf_regs[20] = REG(X20);
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dwarf_regs[21] = REG(X21);
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dwarf_regs[22] = REG(X22);
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dwarf_regs[23] = REG(X23);
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dwarf_regs[24] = REG(X24);
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dwarf_regs[25] = REG(X25);
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dwarf_regs[26] = REG(X26);
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dwarf_regs[27] = REG(X27);
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dwarf_regs[28] = REG(X28);
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dwarf_regs[29] = REG(X29);
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dwarf_regs[30] = REG(LR);
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dwarf_regs[31] = REG(SP);
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if (!dwfl_thread_state_registers(thread, 0, PERF_REG_ARM64_MAX,
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dwarf_regs))
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return false;
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dwarf_pc = REG(PC);
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dwfl_thread_state_register_pc(thread, dwarf_pc);
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return true;
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}
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