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