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98a93b0b56
This patch implements the perf registers sampling and validation API for the riscv arch. The valid registers and their register ID are defined in perf_regs.h. Perf tool can backtrace in userspace with unwind library and the registers/user stack dump support. Signed-off-by: Mao Han <han_mao@c-sky.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Greentime Hu <green.hu@gmail.com> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: linux-riscv <linux-riscv@lists.infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Guo Ren <guoren@kernel.org> Tested-by: Greentime Hu <greentime.hu@sifive.com> [paul.walmsley@sifive.com: minor patch description fix] Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
45 lines
924 B
C
45 lines
924 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. */
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/perf_event.h>
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#include <linux/bug.h>
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#include <asm/perf_regs.h>
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#include <asm/ptrace.h>
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u64 perf_reg_value(struct pt_regs *regs, int idx)
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{
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if (WARN_ON_ONCE((u32)idx >= PERF_REG_RISCV_MAX))
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return 0;
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return ((unsigned long *)regs)[idx];
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}
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#define REG_RESERVED (~((1ULL << PERF_REG_RISCV_MAX) - 1))
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int perf_reg_validate(u64 mask)
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{
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if (!mask || mask & REG_RESERVED)
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return -EINVAL;
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return 0;
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}
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u64 perf_reg_abi(struct task_struct *task)
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{
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#if __riscv_xlen == 64
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return PERF_SAMPLE_REGS_ABI_64;
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#else
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return PERF_SAMPLE_REGS_ABI_32;
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#endif
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}
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void perf_get_regs_user(struct perf_regs *regs_user,
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struct pt_regs *regs,
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struct pt_regs *regs_user_copy)
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{
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regs_user->regs = task_pt_regs(current);
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regs_user->abi = perf_reg_abi(current);
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}
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