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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 | /* * arch/sh/lib/mcount.S * * Copyright (C) 2008, 2009 Paul Mundt * Copyright (C) 2008, 2009 Matt Fleming * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <asm/ftrace.h> #include <asm/thread_info.h> #include <asm/asm-offsets.h> #define MCOUNT_ENTER() \ mov.l r4, @-r15; \ mov.l r5, @-r15; \ mov.l r6, @-r15; \ mov.l r7, @-r15; \ sts.l pr, @-r15; \ \ mov.l @(20,r15),r4; \ sts pr, r5 #define MCOUNT_LEAVE() \ lds.l @r15+, pr; \ mov.l @r15+, r7; \ mov.l @r15+, r6; \ mov.l @r15+, r5; \ rts; \ mov.l @r15+, r4 #ifdef CONFIG_STACK_DEBUG /* * Perform diagnostic checks on the state of the kernel stack. * * Check for stack overflow. If there is less than 1KB free * then it has overflowed. * * Make sure the stack pointer contains a valid address. Valid * addresses for kernel stacks are anywhere after the bss * (after _ebss) and anywhere in init_thread_union (init_stack). */ #define STACK_CHECK() \ mov #(THREAD_SIZE >> 10), r0; \ shll8 r0; \ shll2 r0; \ \ /* r1 = sp & (THREAD_SIZE - 1) */ \ mov #-1, r1; \ add r0, r1; \ and r15, r1; \ \ mov #TI_SIZE, r3; \ mov #(STACK_WARN >> 8), r2; \ shll8 r2; \ add r3, r2; \ \ /* Is the stack overflowing? */ \ cmp/hi r2, r1; \ bf stack_panic; \ \ /* If sp > _ebss then we're OK. */ \ mov.l .L_ebss, r1; \ cmp/hi r1, r15; \ bt 1f; \ \ /* If sp < init_stack, we're not OK. */ \ mov.l .L_init_thread_union, r1; \ cmp/hs r1, r15; \ bf stack_panic; \ \ /* If sp > init_stack && sp < _ebss, not OK. */ \ add r0, r1; \ cmp/hs r1, r15; \ bt stack_panic; \ 1: #else #define STACK_CHECK() #endif /* CONFIG_STACK_DEBUG */ .align 2 .globl _mcount .type _mcount,@function .globl mcount .type mcount,@function _mcount: mcount: STACK_CHECK() #ifndef CONFIG_FUNCTION_TRACER rts nop #else #ifndef CONFIG_DYNAMIC_FTRACE mov.l .Lfunction_trace_stop, r0 mov.l @r0, r0 tst r0, r0 bf ftrace_stub #endif MCOUNT_ENTER() #ifdef CONFIG_DYNAMIC_FTRACE .globl mcount_call mcount_call: mov.l .Lftrace_stub, r6 #else mov.l .Lftrace_trace_function, r6 mov.l ftrace_stub, r7 cmp/eq r6, r7 bt skip_trace mov.l @r6, r6 #endif jsr @r6 nop #ifdef CONFIG_FUNCTION_GRAPH_TRACER mov.l .Lftrace_graph_return, r6 mov.l .Lftrace_stub, r7 cmp/eq r6, r7 bt 1f mov.l .Lftrace_graph_caller, r0 jmp @r0 nop 1: mov.l .Lftrace_graph_entry, r6 mov.l .Lftrace_graph_entry_stub, r7 cmp/eq r6, r7 bt skip_trace mov.l .Lftrace_graph_caller, r0 jmp @r0 nop .align 2 .Lftrace_graph_return: .long ftrace_graph_return .Lftrace_graph_entry: .long ftrace_graph_entry .Lftrace_graph_entry_stub: .long ftrace_graph_entry_stub .Lftrace_graph_caller: .long ftrace_graph_caller #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ .globl skip_trace skip_trace: MCOUNT_LEAVE() .align 2 .Lftrace_trace_function: .long ftrace_trace_function #ifdef CONFIG_DYNAMIC_FTRACE #ifdef CONFIG_FUNCTION_GRAPH_TRACER /* * NOTE: Do not move either ftrace_graph_call or ftrace_caller * as this will affect the calculation of GRAPH_INSN_OFFSET. */ .globl ftrace_graph_call ftrace_graph_call: mov.l .Lskip_trace, r0 jmp @r0 nop .align 2 .Lskip_trace: .long skip_trace #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ .globl ftrace_caller ftrace_caller: mov.l .Lfunction_trace_stop, r0 mov.l @r0, r0 tst r0, r0 bf ftrace_stub MCOUNT_ENTER() .globl ftrace_call ftrace_call: mov.l .Lftrace_stub, r6 jsr @r6 nop #ifdef CONFIG_FUNCTION_GRAPH_TRACER bra ftrace_graph_call nop #else MCOUNT_LEAVE() #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ #endif /* CONFIG_DYNAMIC_FTRACE */ .align 2 .Lfunction_trace_stop: .long function_trace_stop /* * NOTE: From here on the locations of the .Lftrace_stub label and * ftrace_stub itself are fixed. Adding additional data here will skew * the displacement for the memory table and break the block replacement. * Place new labels either after the ftrace_stub body, or before * ftrace_caller. You have been warned. */ .Lftrace_stub: .long ftrace_stub .globl ftrace_stub ftrace_stub: rts nop #ifdef CONFIG_FUNCTION_GRAPH_TRACER .globl ftrace_graph_caller ftrace_graph_caller: mov.l 2f, r0 mov.l @r0, r0 tst r0, r0 bt 1f mov.l 3f, r1 jmp @r1 nop 1: /* * MCOUNT_ENTER() pushed 5 registers onto the stack, so * the stack address containing our return address is * r15 + 20. */ mov #20, r0 add r15, r0 mov r0, r4 mov.l .Lprepare_ftrace_return, r0 jsr @r0 nop MCOUNT_LEAVE() .align 2 2: .long function_trace_stop 3: .long skip_trace .Lprepare_ftrace_return: .long prepare_ftrace_return .globl return_to_handler return_to_handler: /* * Save the return values. */ mov.l r0, @-r15 mov.l r1, @-r15 mov #0, r4 mov.l .Lftrace_return_to_handler, r0 jsr @r0 nop /* * The return value from ftrace_return_handler has the real * address that we should return to. */ lds r0, pr mov.l @r15+, r1 rts mov.l @r15+, r0 .align 2 .Lftrace_return_to_handler: .long ftrace_return_to_handler #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ #endif /* CONFIG_FUNCTION_TRACER */ #ifdef CONFIG_STACK_DEBUG .globl stack_panic stack_panic: mov.l .Ldump_stack, r0 jsr @r0 nop mov.l .Lpanic, r0 jsr @r0 mov.l .Lpanic_s, r4 rts nop .align 2 .L_ebss: .long _ebss .L_init_thread_union: .long init_thread_union .Lpanic: .long panic .Lpanic_s: .long .Lpanic_str .Ldump_stack: .long dump_stack .section .rodata .align 2 .Lpanic_str: .string "Stack error" #endif /* CONFIG_STACK_DEBUG */ |