Changes in kernel/arch/ia32/src/asm.S [b8230b9:8fb47ec0] in mainline
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kernel/arch/ia32/src/asm.S (modified) (1 diff)
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kernel/arch/ia32/src/asm.S
rb8230b9 r8fb47ec0 198 198 #define INTERRUPT_ALIGN 64 199 199 .macro handler i n 200 201 .ifeq \i - 0x30 # Syscall handler 202 pushl %ds 203 pushl %es 204 pushl %fs 205 pushl %gs 206 207 # 208 # Push syscall arguments onto the stack 209 # 210 # NOTE: The idea behind the order of arguments passed in registers is to 211 # use all scratch registers first and preserved registers next. 212 # An optimized libc syscall wrapper can make use of this setup. 213 # 214 pushl %eax 215 pushl %ebp 216 pushl %edi 217 pushl %esi 218 pushl %ebx 219 pushl %ecx 220 pushl %edx 221 222 # we must fill the data segment registers 223 movw $16, %ax 224 movw %ax, %ds 225 movw %ax, %es 226 227 cld 228 sti 229 # syscall_handler(edx, ecx, ebx, esi, edi, ebp, eax) 230 call syscall_handler 231 cli 232 addl $28, %esp # clean-up of parameters 233 234 popl %gs 235 popl %fs 236 popl %es 237 popl %ds 238 239 CLEAR_NT_FLAG 240 iret 241 .else 242 /* 243 * This macro distinguishes between two versions of ia32 exceptions. 244 * One version has error word and the other does not have it. 245 * The latter version fakes the error word on the stack so that the 246 * handlers and istate_t can be the same for both types. 247 */ 248 .iflt \i - 32 249 .if (1 << \i) & ERROR_WORD_INTERRUPT_LIST 250 /* 251 * With error word, do nothing 252 */ 253 .else 254 /* 255 * Version without error word 256 */ 257 subl $4, %esp 258 .endif 259 .else 260 /* 261 * Version without error word 200 201 .ifeq \i - 0x30 # Syscall handler 202 pushl %ds 203 pushl %es 204 pushl %fs 205 pushl %gs 206 207 # 208 # Push syscall arguments onto the stack 209 # 210 # NOTE: The idea behind the order of arguments passed in registers is to 211 # use all scratch registers first and preserved registers next. 212 # An optimized libc syscall wrapper can make use of this setup. 213 # 214 pushl %eax 215 pushl %ebp 216 pushl %edi 217 pushl %esi 218 pushl %ebx 219 pushl %ecx 220 pushl %edx 221 222 # we must fill the data segment registers 223 movw $16, %ax 224 movw %ax, %ds 225 movw %ax, %es 226 227 cld 228 sti 229 # syscall_handler(edx, ecx, ebx, esi, edi, ebp, eax) 230 call syscall_handler 231 cli 232 addl $28, %esp # clean-up of parameters 233 234 popl %gs 235 popl %fs 236 popl %es 237 popl %ds 238 239 CLEAR_NT_FLAG 240 iret 241 .else 242 /* 243 * This macro distinguishes between two versions of ia32 exceptions. 244 * One version has error word and the other does not have it. 245 * The latter version fakes the error word on the stack so that the 246 * handlers and istate_t can be the same for both types. 247 */ 248 .iflt \i - 32 249 .if (1 << \i) & ERROR_WORD_INTERRUPT_LIST 250 /* 251 * With error word, do nothing 262 252 */ 253 .else 254 /* 255 * Version without error word, 256 */ 263 257 subl $4, %esp 264 .endif 265 266 pushl %ds 267 pushl %es 268 pushl %fs 269 pushl %gs 270 271 pushl %ebp 272 pushl %edx 273 pushl %ecx 274 pushl %eax 275 276 # we must fill the data segment registers 277 278 movw $16, %ax 279 movw %ax, %ds 280 movw %ax, %es 281 282 # stop stack traces here 283 xorl %ebp, %ebp 284 285 pushl %esp # *istate 286 pushl $(\i) # intnum 287 call exc_dispatch # exc_dispatch(intnum, *istate) 288 addl $8, %esp # Clear arguments from stack 289 290 CLEAR_NT_FLAG # Modifies %ecx 291 292 popl %eax 293 popl %ecx 294 popl %edx 295 popl %ebp 296 297 popl %gs 298 popl %fs 299 popl %es 300 popl %ds 301 302 # skip error word, no matter whether real or fake 303 addl $4, %esp 304 iret 258 .endif 259 .else 260 /* 261 * Version without error word, 262 */ 263 subl $4, %esp 305 264 .endif 306 265 266 pushl %ds 267 pushl %es 268 pushl %fs 269 pushl %gs 270 271 pushl %ebp 272 pushl %edx 273 pushl %ecx 274 pushl %eax 275 276 # we must fill the data segment registers 277 movw $16, %ax 278 movw %ax, %ds 279 movw %ax, %es 280 281 # stop stack traces here 282 xorl %ebp, %ebp 283 284 pushl %esp # *istate 285 pushl $(\i) # intnum 286 call exc_dispatch # excdispatch(intnum, *istate) 287 addl $8, %esp # Clear arguments from stack 288 289 CLEAR_NT_FLAG # Modifies %ecx 290 291 popl %eax 292 popl %ecx 293 popl %edx 294 popl %ebp 295 296 popl %gs 297 popl %fs 298 popl %es 299 popl %ds 300 301 addl $4, %esp # Skip error word, no matter whether real or fake. 302 iret 303 .endif 304 307 305 .align INTERRUPT_ALIGN 308 306 .if (\n- \i) - 1 309 307 handler "(\i + 1)", \n 310 308 .endif 311 309 .endm
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