| entry-ftrace.S (6f84981772535e670e4e2df051a672af229b6694) | entry-ftrace.S (baaf553d3bc330697c68a00f96cf11f4edfeac7e) |
|---|---|
| 1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * arch/arm64/kernel/entry-ftrace.S 4 * 5 * Copyright (C) 2013 Linaro Limited 6 * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> 7 */ 8 --- 51 unchanged lines hidden (view full) --- 60 /* Create a frame record for the callsite above the ftrace regs */ 61 stp x29, x9, [sp, #FREGS_SIZE + 16] 62 add x29, sp, #FREGS_SIZE + 16 63 64 /* Create our frame record above the ftrace regs */ 65 stp x29, x30, [sp, #FREGS_SIZE] 66 add x29, sp, #FREGS_SIZE 67 | 1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * arch/arm64/kernel/entry-ftrace.S 4 * 5 * Copyright (C) 2013 Linaro Limited 6 * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> 7 */ 8 --- 51 unchanged lines hidden (view full) --- 60 /* Create a frame record for the callsite above the ftrace regs */ 61 stp x29, x9, [sp, #FREGS_SIZE + 16] 62 add x29, sp, #FREGS_SIZE + 16 63 64 /* Create our frame record above the ftrace regs */ 65 stp x29, x30, [sp, #FREGS_SIZE] 66 add x29, sp, #FREGS_SIZE 67 |
| 68 sub x0, x30, #AARCH64_INSN_SIZE // ip (callsite's BL insn) 69 mov x1, x9 // parent_ip (callsite's LR) 70 ldr_l x2, function_trace_op // op 71 mov x3, sp // regs | 68 /* Prepare arguments for the the tracer func */ 69 sub x0, x30, #AARCH64_INSN_SIZE // ip (callsite's BL insn) 70 mov x1, x9 // parent_ip (callsite's LR) 71 mov x3, sp // regs |
| 72 | 72 |
| 73#ifdef CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS 74 /* 75 * The literal pointer to the ops is at an 8-byte aligned boundary 76 * which is either 12 or 16 bytes before the BL instruction in the call 77 * site. See ftrace_call_adjust() for details. 78 * 79 * Therefore here the LR points at `literal + 16` or `literal + 20`, 80 * and we can find the address of the literal in either case by 81 * aligning to an 8-byte boundary and subtracting 16. We do the 82 * alignment first as this allows us to fold the subtraction into the 83 * LDR. 84 */ 85 bic x2, x30, 0x7 86 ldr x2, [x2, #-16] // op 87 88 ldr x4, [x2, #FTRACE_OPS_FUNC] // op->func 89 blr x4 // op->func(ip, parent_ip, op, regs) 90 91#else 92 ldr_l x2, function_trace_op // op 93 |
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| 73SYM_INNER_LABEL(ftrace_call, SYM_L_GLOBAL) | 94SYM_INNER_LABEL(ftrace_call, SYM_L_GLOBAL) |
| 74 bl ftrace_stub | 95 bl ftrace_stub // func(ip, parent_ip, op, regs) 96#endif |
| 75 76/* 77 * At the callsite x0-x8 and x19-x30 were live. Any C code will have preserved 78 * x19-x29 per the AAPCS, and we created frame records upon entry, so we need 79 * to restore x0-x8, x29, and x30. 80 */ 81 /* Restore function arguments */ 82 ldp x0, x1, [sp, #FREGS_X0] --- 188 unchanged lines hidden --- | 97 98/* 99 * At the callsite x0-x8 and x19-x30 were live. Any C code will have preserved 100 * x19-x29 per the AAPCS, and we created frame records upon entry, so we need 101 * to restore x0-x8, x29, and x30. 102 */ 103 /* Restore function arguments */ 104 ldp x0, x1, [sp, #FREGS_X0] --- 188 unchanged lines hidden --- |