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59 lines
1.5 KiB
59 lines
1.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#include <linux/linkage.h> |
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#define R0 0x00 |
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#define R1 0x08 |
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#define R2 0x10 |
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#define R3 0x18 |
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#define R4 0x20 |
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#define R5 0x28 |
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#define R6 0x30 |
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#define R7 0x38 |
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#define R8 0x40 |
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#define R9 0x48 |
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#define SL 0x50 |
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#define FP 0x58 |
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#define IP 0x60 |
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#define SP 0x68 |
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#define LR 0x70 |
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#define PC 0x78 |
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/* |
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* Implementation of void perf_regs_load(u64 *regs); |
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* |
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* This functions fills in the 'regs' buffer from the actual registers values, |
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* in the way the perf built-in unwinding test expects them: |
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* - the PC at the time at the call to this function. Since this function |
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* is called using a bl instruction, the PC value is taken from LR. |
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* The built-in unwinding test then unwinds the call stack from the dwarf |
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* information in unwind__get_entries. |
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* |
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* Notes: |
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* - the 8 bytes stride in the registers offsets comes from the fact |
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* that the registers are stored in an u64 array (u64 *regs), |
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* - the regs buffer needs to be zeroed before the call to this function, |
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* in this case using a calloc in dwarf-unwind.c. |
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*/ |
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.text |
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.type perf_regs_load,%function |
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SYM_FUNC_START(perf_regs_load) |
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str r0, [r0, #R0] |
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str r1, [r0, #R1] |
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str r2, [r0, #R2] |
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str r3, [r0, #R3] |
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str r4, [r0, #R4] |
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str r5, [r0, #R5] |
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str r6, [r0, #R6] |
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str r7, [r0, #R7] |
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str r8, [r0, #R8] |
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str r9, [r0, #R9] |
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str sl, [r0, #SL] |
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str fp, [r0, #FP] |
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str ip, [r0, #IP] |
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str sp, [r0, #SP] |
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str lr, [r0, #LR] |
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str lr, [r0, #PC] // store pc as lr in order to skip the call |
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// to this function |
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mov pc, lr |
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SYM_FUNC_END(perf_regs_load)
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