projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| e18eead3 SR |
1 | /* |
| 2 | * linux/arch/x86_64/mcount_64.S | |
| 3 | * | |
| 4 | * Copyright (C) 2014 Steven Rostedt, Red Hat Inc | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/linkage.h> | |
| 8 | #include <asm/ptrace.h> | |
| 9 | #include <asm/ftrace.h> | |
| 10 | ||
| 11 | ||
| 12 | .code64 | |
| 13 | .section .entry.text, "ax" | |
| 14 | ||
| 15 | ||
| 16 | #ifdef CONFIG_FUNCTION_TRACER | |
| 17 | ||
| 18 | #ifdef CC_USING_FENTRY | |
| 19 | # define function_hook __fentry__ | |
| 20 | #else | |
| 21 | # define function_hook mcount | |
| 22 | #endif | |
| 23 | ||
| 24 | #ifdef CONFIG_DYNAMIC_FTRACE | |
| 25 | ||
| 26 | ENTRY(function_hook) | |
| 27 | retq | |
| 28 | END(function_hook) | |
| 29 | ||
| 30 | /* skip is set if stack has been adjusted */ | |
| 31 | .macro ftrace_caller_setup skip=0 | |
| 32 | MCOUNT_SAVE_FRAME \skip | |
| 33 | ||
| 34 | /* Load the ftrace_ops into the 3rd parameter */ | |
| 35 | movq function_trace_op(%rip), %rdx | |
| 36 | ||
| 37 | /* Load ip into the first parameter */ | |
| 38 | movq RIP(%rsp), %rdi | |
| 39 | subq $MCOUNT_INSN_SIZE, %rdi | |
| 40 | /* Load the parent_ip into the second parameter */ | |
| 41 | #ifdef CC_USING_FENTRY | |
| 42 | movq SS+16(%rsp), %rsi | |
| 43 | #else | |
| 44 | movq 8(%rbp), %rsi | |
| 45 | #endif | |
| 46 | .endm | |
| 47 | ||
| 48 | ENTRY(ftrace_caller) | |
| e18eead3 SR |
49 | ftrace_caller_setup |
| 50 | /* regs go into 4th parameter (but make it NULL) */ | |
| 51 | movq $0, %rcx | |
| 52 | ||
| 53 | GLOBAL(ftrace_call) | |
| 54 | call ftrace_stub | |
| 55 | ||
| 56 | MCOUNT_RESTORE_FRAME | |
| 57 | ftrace_return: | |
| 58 | ||
| 59 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| 60 | GLOBAL(ftrace_graph_call) | |
| 61 | jmp ftrace_stub | |
| 62 | #endif | |
| 63 | ||
| 64 | GLOBAL(ftrace_stub) | |
| 65 | retq | |
| 66 | END(ftrace_caller) | |
| 67 | ||
| 68 | ENTRY(ftrace_regs_caller) | |
| 69 | /* Save the current flags before compare (in SS location)*/ | |
| 70 | pushfq | |
| 71 | ||
| e18eead3 SR |
72 | /* skip=8 to skip flags saved in SS */ |
| 73 | ftrace_caller_setup 8 | |
| 74 | ||
| 75 | /* Save the rest of pt_regs */ | |
| 76 | movq %r15, R15(%rsp) | |
| 77 | movq %r14, R14(%rsp) | |
| 78 | movq %r13, R13(%rsp) | |
| 79 | movq %r12, R12(%rsp) | |
| 80 | movq %r11, R11(%rsp) | |
| 81 | movq %r10, R10(%rsp) | |
| 82 | movq %rbp, RBP(%rsp) | |
| 83 | movq %rbx, RBX(%rsp) | |
| 84 | /* Copy saved flags */ | |
| 85 | movq SS(%rsp), %rcx | |
| 86 | movq %rcx, EFLAGS(%rsp) | |
| 87 | /* Kernel segments */ | |
| 88 | movq $__KERNEL_DS, %rcx | |
| 89 | movq %rcx, SS(%rsp) | |
| 90 | movq $__KERNEL_CS, %rcx | |
| 91 | movq %rcx, CS(%rsp) | |
| 92 | /* Stack - skipping return address */ | |
| 93 | leaq SS+16(%rsp), %rcx | |
| 94 | movq %rcx, RSP(%rsp) | |
| 95 | ||
| 96 | /* regs go into 4th parameter */ | |
| 97 | leaq (%rsp), %rcx | |
| 98 | ||
| 99 | GLOBAL(ftrace_regs_call) | |
| 100 | call ftrace_stub | |
| 101 | ||
| 102 | /* Copy flags back to SS, to restore them */ | |
| 103 | movq EFLAGS(%rsp), %rax | |
| 104 | movq %rax, SS(%rsp) | |
| 105 | ||
| 106 | /* Handlers can change the RIP */ | |
| 107 | movq RIP(%rsp), %rax | |
| 108 | movq %rax, SS+8(%rsp) | |
| 109 | ||
| 110 | /* restore the rest of pt_regs */ | |
| 111 | movq R15(%rsp), %r15 | |
| 112 | movq R14(%rsp), %r14 | |
| 113 | movq R13(%rsp), %r13 | |
| 114 | movq R12(%rsp), %r12 | |
| 115 | movq R10(%rsp), %r10 | |
| 116 | movq RBP(%rsp), %rbp | |
| 117 | movq RBX(%rsp), %rbx | |
| 118 | ||
| 119 | /* skip=8 to skip flags saved in SS */ | |
| 120 | MCOUNT_RESTORE_FRAME 8 | |
| 121 | ||
| 122 | /* Restore flags */ | |
| 123 | popfq | |
| 124 | ||
| 125 | jmp ftrace_return | |
| fdc841b5 | 126 | |
| e18eead3 SR |
127 | popfq |
| 128 | jmp ftrace_stub | |
| 129 | ||
| 130 | END(ftrace_regs_caller) | |
| 131 | ||
| 132 | ||
| 133 | #else /* ! CONFIG_DYNAMIC_FTRACE */ | |
| 134 | ||
| 135 | ENTRY(function_hook) | |
| e18eead3 SR |
136 | cmpq $ftrace_stub, ftrace_trace_function |
| 137 | jnz trace | |
| 138 | ||
| 139 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| 140 | cmpq $ftrace_stub, ftrace_graph_return | |
| 141 | jnz ftrace_graph_caller | |
| 142 | ||
| 143 | cmpq $ftrace_graph_entry_stub, ftrace_graph_entry | |
| 144 | jnz ftrace_graph_caller | |
| 145 | #endif | |
| 146 | ||
| 147 | GLOBAL(ftrace_stub) | |
| 148 | retq | |
| 149 | ||
| 150 | trace: | |
| 151 | MCOUNT_SAVE_FRAME | |
| 152 | ||
| 153 | movq RIP(%rsp), %rdi | |
| 154 | #ifdef CC_USING_FENTRY | |
| 155 | movq SS+16(%rsp), %rsi | |
| 156 | #else | |
| 157 | movq 8(%rbp), %rsi | |
| 158 | #endif | |
| 159 | subq $MCOUNT_INSN_SIZE, %rdi | |
| 160 | ||
| 161 | call *ftrace_trace_function | |
| 162 | ||
| 163 | MCOUNT_RESTORE_FRAME | |
| 164 | ||
| 165 | jmp ftrace_stub | |
| 166 | END(function_hook) | |
| 167 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
| 168 | #endif /* CONFIG_FUNCTION_TRACER */ | |
| 169 | ||
| 170 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| 171 | ENTRY(ftrace_graph_caller) | |
| 172 | MCOUNT_SAVE_FRAME | |
| 173 | ||
| 174 | #ifdef CC_USING_FENTRY | |
| 175 | leaq SS+16(%rsp), %rdi | |
| 176 | movq $0, %rdx /* No framepointers needed */ | |
| 177 | #else | |
| 178 | leaq 8(%rbp), %rdi | |
| 179 | movq (%rbp), %rdx | |
| 180 | #endif | |
| 181 | movq RIP(%rsp), %rsi | |
| 182 | subq $MCOUNT_INSN_SIZE, %rsi | |
| 183 | ||
| 184 | call prepare_ftrace_return | |
| 185 | ||
| 186 | MCOUNT_RESTORE_FRAME | |
| 187 | ||
| 188 | retq | |
| 189 | END(ftrace_graph_caller) | |
| 190 | ||
| 191 | GLOBAL(return_to_handler) | |
| 192 | subq $24, %rsp | |
| 193 | ||
| 194 | /* Save the return values */ | |
| 195 | movq %rax, (%rsp) | |
| 196 | movq %rdx, 8(%rsp) | |
| 197 | movq %rbp, %rdi | |
| 198 | ||
| 199 | call ftrace_return_to_handler | |
| 200 | ||
| 201 | movq %rax, %rdi | |
| 202 | movq 8(%rsp), %rdx | |
| 203 | movq (%rsp), %rax | |
| 204 | addq $24, %rsp | |
| 205 | jmp *%rdi | |
| 206 | #endif |