64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "arm64-frame-pointer-unwind-support.h"
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#include "callchain.h"
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#include "event.h"
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#include "perf_regs.h" // SMPL_REG_MASK
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#include "unwind.h"
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#define perf_event_arm_regs perf_event_arm64_regs
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#include "../../arch/arm64/include/uapi/asm/perf_regs.h"
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#undef perf_event_arm_regs
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struct entries {
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u64 stack[2];
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size_t length;
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};
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static bool get_leaf_frame_caller_enabled(struct perf_sample *sample)
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{
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return callchain_param.record_mode == CALLCHAIN_FP && sample->user_regs.regs
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&& sample->user_regs.mask & SMPL_REG_MASK(PERF_REG_ARM64_LR);
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}
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static int add_entry(struct unwind_entry *entry, void *arg)
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{
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struct entries *entries = arg;
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entries->stack[entries->length++] = entry->ip;
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return 0;
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}
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u64 get_leaf_frame_caller_aarch64(struct perf_sample *sample, struct thread *thread, int usr_idx)
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{
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int ret;
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struct entries entries = {};
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struct regs_dump old_regs = sample->user_regs;
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if (!get_leaf_frame_caller_enabled(sample))
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return 0;
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/*
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* If PC and SP are not recorded, get the value of PC from the stack
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* and set its mask. SP is not used when doing the unwinding but it
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* still needs to be set to prevent failures.
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*/
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if (!(sample->user_regs.mask & SMPL_REG_MASK(PERF_REG_ARM64_PC))) {
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sample->user_regs.cache_mask |= SMPL_REG_MASK(PERF_REG_ARM64_PC);
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sample->user_regs.cache_regs[PERF_REG_ARM64_PC] = sample->callchain->ips[usr_idx+1];
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}
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if (!(sample->user_regs.mask & SMPL_REG_MASK(PERF_REG_ARM64_SP))) {
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sample->user_regs.cache_mask |= SMPL_REG_MASK(PERF_REG_ARM64_SP);
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sample->user_regs.cache_regs[PERF_REG_ARM64_SP] = 0;
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}
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ret = unwind__get_entries(add_entry, &entries, thread, sample, 2, true);
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sample->user_regs = old_regs;
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if (ret || entries.length != 2)
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return ret;
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return callchain_param.order == ORDER_CALLER ? entries.stack[0] : entries.stack[1];
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}
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