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// SPDX-License-Identifier: GPL-2.0
#include <linux/bits.h>
#include <linux/perf_event.h>
#include <linux/sched/task_stack.h>
#include <asm/perf_regs.h>
#define REG(idx, field) \
[PERF_REG_ALPHA_##idx] = offsetof(struct pt_regs, field)
#define REG_RESERVED (~GENMASK_ULL(PERF_REG_ALPHA_MAX - 1, 0) | \
GENMASK_ULL(PERF_REG_ALPHA_R15, PERF_REG_ALPHA_R9))
static const unsigned int pt_regs_offset[PERF_REG_ALPHA_MAX] = {
REG(R0, r0), REG(R1, r1), REG(R2, r2), REG(R3, r3),
REG(R4, r4), REG(R5, r5), REG(R6, r6), REG(R7, r7),
REG(R8, r8), REG(R16, r16), REG(R17, r17), REG(R18, r18),
REG(R19, r19), REG(R20, r20), REG(R21, r21), REG(R22, r22),
REG(R23, r23), REG(R24, r24), REG(R25, r25), REG(R26, r26),
REG(R27, r27), REG(R28, r28), REG(GP, gp), REG(PC, pc),
};
u64 perf_reg_value(struct pt_regs *regs, int idx)
{
if (idx == PERF_REG_ALPHA_SP) {
if (user_mode(regs))
return user_stack_pointer(regs);
/*
* Software events built by perf_fetch_caller_regs() use a
* per-CPU pt_regs rather than a trap frame, and pt_regs has
* nowhere to record sp, so report none.
*/
if (!object_is_on_stack(regs))
return 0;
/* Same kernel sp approximation as stacktrace.c. */
return (unsigned long)(regs + 1);
}
if (WARN_ON_ONCE((u32)idx >= PERF_REG_ALPHA_MAX ||
BIT_ULL(idx) & REG_RESERVED))
return 0;
return *(unsigned long *)((void *)regs + pt_regs_offset[idx]);
}
int perf_reg_validate(u64 mask)
{
if (!mask || mask & REG_RESERVED)
return -EINVAL;
return 0;
}
u64 perf_reg_abi(struct task_struct *task)
{
return PERF_SAMPLE_REGS_ABI_64;
}
void perf_get_regs_user(struct perf_regs *regs_user,
struct pt_regs *regs)
{
regs_user->regs = task_pt_regs(current);
regs_user->abi = perf_reg_abi(current);
}
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