projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| dbe3ba30 QZ |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* | |
| 3 | * LoongArch specific _mcount support | |
| 4 | * | |
| 5 | * Copyright (C) 2022 Loongson Technology Corporation Limited | |
| 6 | */ | |
| 7 | ||
| 8 | #include <asm/export.h> | |
| 9 | #include <asm/ftrace.h> | |
| 10 | #include <asm/regdef.h> | |
| 11 | #include <asm/stackframe.h> | |
| 12 | ||
| 13 | .text | |
| 14 | ||
| 15 | #define MCOUNT_S0_OFFSET (0) | |
| 16 | #define MCOUNT_RA_OFFSET (SZREG) | |
| 17 | #define MCOUNT_STACK_SIZE (2 * SZREG) | |
| 18 | ||
| 19 | .macro MCOUNT_SAVE_REGS | |
| 20 | PTR_ADDI sp, sp, -MCOUNT_STACK_SIZE | |
| 21 | PTR_S s0, sp, MCOUNT_S0_OFFSET | |
| 22 | PTR_S ra, sp, MCOUNT_RA_OFFSET | |
| 23 | move s0, a0 | |
| 24 | .endm | |
| 25 | ||
| 26 | .macro MCOUNT_RESTORE_REGS | |
| 27 | move a0, s0 | |
| 28 | PTR_L ra, sp, MCOUNT_RA_OFFSET | |
| 29 | PTR_L s0, sp, MCOUNT_S0_OFFSET | |
| 30 | PTR_ADDI sp, sp, MCOUNT_STACK_SIZE | |
| 31 | .endm | |
| 32 | ||
| 33 | SYM_FUNC_START(_mcount) | |
| 34 | la.pcrel t1, ftrace_stub | |
| 35 | la.pcrel t2, ftrace_trace_function /* Prepare t2 for (1) */ | |
| 36 | PTR_L t2, t2, 0 | |
| 37 | beq t1, t2, fgraph_trace | |
| 38 | ||
| 39 | MCOUNT_SAVE_REGS | |
| 40 | ||
| 41 | move a0, ra /* arg0: self return address */ | |
| 42 | move a1, s0 /* arg1: parent's return address */ | |
| 43 | jirl ra, t2, 0 /* (1) call *ftrace_trace_function */ | |
| 44 | ||
| 45 | MCOUNT_RESTORE_REGS | |
| 46 | ||
| 47 | fgraph_trace: | |
| 48 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| 49 | la.pcrel t1, ftrace_stub | |
| 50 | la.pcrel t3, ftrace_graph_return | |
| 51 | PTR_L t3, t3, 0 | |
| 52 | bne t1, t3, ftrace_graph_caller | |
| 53 | la.pcrel t1, ftrace_graph_entry_stub | |
| 54 | la.pcrel t3, ftrace_graph_entry | |
| 55 | PTR_L t3, t3, 0 | |
| 56 | bne t1, t3, ftrace_graph_caller | |
| 57 | #endif | |
| 58 | ||
| 59 | SYM_INNER_LABEL(ftrace_stub, SYM_L_GLOBAL) | |
| 60 | jr ra | |
| 61 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| 62 | SYM_INNER_LABEL(ftrace_graph_func, SYM_L_GLOBAL) | |
| 63 | bl ftrace_stub | |
| 64 | #endif | |
| 65 | SYM_FUNC_END(_mcount) | |
| 66 | EXPORT_SYMBOL(_mcount) | |
| 67 | ||
| 68 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| 69 | SYM_FUNC_START(ftrace_graph_caller) | |
| 70 | MCOUNT_SAVE_REGS | |
| 71 | ||
| 72 | PTR_ADDI a0, ra, -4 /* arg0: Callsite self return addr */ | |
| 73 | PTR_ADDI a1, sp, MCOUNT_STACK_SIZE /* arg1: Callsite sp */ | |
| 74 | move a2, s0 /* arg2: Callsite parent ra */ | |
| 75 | bl prepare_ftrace_return | |
| 76 | ||
| 77 | MCOUNT_RESTORE_REGS | |
| 78 | jr ra | |
| 79 | SYM_FUNC_END(ftrace_graph_caller) | |
| 80 | ||
| 81 | SYM_FUNC_START(return_to_handler) | |
| 82 | PTR_ADDI sp, sp, -2 * SZREG | |
| 83 | PTR_S a0, sp, 0 | |
| 84 | PTR_S a1, sp, SZREG | |
| 85 | ||
| 86 | bl ftrace_return_to_handler | |
| 87 | ||
| 88 | /* Restore the real parent address: a0 -> ra */ | |
| 89 | move ra, a0 | |
| 90 | ||
| 91 | PTR_L a0, sp, 0 | |
| 92 | PTR_L a1, sp, SZREG | |
| 93 | PTR_ADDI sp, sp, 2 * SZREG | |
| 94 | jr ra | |
| 95 | SYM_FUNC_END(return_to_handler) | |
| 96 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |