| 1 | |
| 2 |
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| 3 | #include <linux/bits.h>
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| 4 | #include <linux/perf_event.h>
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| 5 | #include <linux/sched/task_stack.h>
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| 6 | #include <asm/perf_regs.h>
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| 7 |
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| 8 | #define REG(idx, field) \
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| 9 | [PERF_REG_ALPHA_##idx] = offsetof(struct pt_regs, field)
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| 10 |
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| 11 | #define REG_RESERVED (~GENMASK_ULL(PERF_REG_ALPHA_MAX - 1, 0) | \
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| 12 | GENMASK_ULL(PERF_REG_ALPHA_R15, PERF_REG_ALPHA_R9))
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| 13 |
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| 14 | static const unsigned int pt_regs_offset[PERF_REG_ALPHA_MAX] = {
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| 15 | REG(R0, r0), REG(R1, r1), REG(R2, r2), REG(R3, r3),
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| 16 | REG(R4, r4), REG(R5, r5), REG(R6, r6), REG(R7, r7),
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| 17 | REG(R8, r8), REG(R16, r16), REG(R17, r17), REG(R18, r18),
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| 18 | REG(R19, r19), REG(R20, r20), REG(R21, r21), REG(R22, r22),
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| 19 | REG(R23, r23), REG(R24, r24), REG(R25, r25), REG(R26, r26),
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| 20 | REG(R27, r27), REG(R28, r28), REG(GP, gp), REG(PC, pc),
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| 21 | };
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| 22 |
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| 23 | u64 perf_reg_value(struct pt_regs *regs, int idx)
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| 24 | {
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| 25 | if (idx == PERF_REG_ALPHA_SP) {
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| 26 | if (user_mode(regs))
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| 27 | return user_stack_pointer(regs);
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| 28 | |
| 29 | * Software events built by perf_fetch_caller_regs() use a
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| 30 | * per-CPU pt_regs rather than a trap frame, and pt_regs has
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| 31 | * nowhere to record sp, so report none.
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| 32 |
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| 33 | if (!object_is_on_stack(regs))
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| 34 | return 0;
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| 35 |
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| 36 | return (unsigned long)(regs + 1);
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| 37 | }
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| 38 |
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| 39 | if (WARN_ON_ONCE((u32)idx >= PERF_REG_ALPHA_MAX ||
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| 40 | BIT_ULL(idx) & REG_RESERVED))
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| 41 | return 0;
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| 42 |
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| 43 | return *(unsigned long *)((void *)regs + pt_regs_offset[idx]);
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| 44 | }
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| 45 |
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| 46 | int perf_reg_validate(u64 mask)
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| 47 | {
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| 48 | if (!mask || mask & REG_RESERVED)
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| 49 | return -EINVAL;
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| 50 |
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| 51 | return 0;
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| 52 | }
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| 53 |
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| 54 | u64 perf_reg_abi(struct task_struct *task)
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| 55 | {
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| 56 | return PERF_SAMPLE_REGS_ABI_64;
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| 57 | }
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| 58 |
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| 59 | void perf_get_regs_user(struct perf_regs *regs_user,
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| 60 | struct pt_regs *regs)
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| 61 | {
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| 62 | regs_user->regs = task_pt_regs(current);
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| 63 | regs_user->abi = perf_reg_abi(current);
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| 64 | }
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