| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * Performance event callchain support - SuperH architecture code |
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| 4 | * |
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| 5 | * Copyright (C) 2009 Paul Mundt |
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| 6 | */ |
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| 7 | #include <linux/kernel.h> |
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| 8 | #include <linux/sched.h> |
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| 9 | #include <linux/perf_event.h> |
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| 10 | #include <linux/percpu.h> |
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| 11 | #include <asm/unwinder.h> |
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| 12 | #include <asm/ptrace.h> |
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| 13 | |
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| 14 | static void callchain_address(void *data, unsigned long addr, int reliable) |
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| 15 | { |
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| 16 | struct perf_callchain_entry_ctx *entry = data; |
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| 17 | |
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| 18 | if (reliable) |
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| 19 | perf_callchain_store(ctx: entry, ip: addr); |
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| 20 | } |
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| 21 | |
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| 22 | static const struct stacktrace_ops callchain_ops = { |
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| 23 | .address = callchain_address, |
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| 24 | }; |
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| 25 | |
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| 26 | void |
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| 27 | perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) |
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| 28 | { |
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| 29 | perf_callchain_store(ctx: entry, ip: regs->pc); |
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| 30 | |
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| 31 | unwind_stack(NULL, regs, NULL, &callchain_ops, entry); |
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| 32 | } |
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| 33 | |
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