Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: rtrap.S,v 1.61 2002/02/09 19:49:31 davem Exp $ |
| 2 | * rtrap.S: Preparing for return from trap on Sparc V9. |
| 3 | * |
| 4 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| 5 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) |
| 6 | */ |
| 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | |
| 9 | #include <asm/asi.h> |
| 10 | #include <asm/pstate.h> |
| 11 | #include <asm/ptrace.h> |
| 12 | #include <asm/spitfire.h> |
| 13 | #include <asm/head.h> |
| 14 | #include <asm/visasm.h> |
| 15 | #include <asm/processor.h> |
| 16 | |
| 17 | #define RTRAP_PSTATE (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE) |
| 18 | #define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV) |
| 19 | #define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG) |
| 20 | |
| 21 | /* Register %l6 keeps track of whether we are returning |
| 22 | * from a system call or not. It is cleared if we call |
| 23 | * do_notify_resume, and it must not be otherwise modified |
| 24 | * until we fully commit to returning to userspace. |
| 25 | */ |
| 26 | |
| 27 | .text |
| 28 | .align 32 |
| 29 | __handle_softirq: |
| 30 | call do_softirq |
| 31 | nop |
| 32 | ba,a,pt %xcc, __handle_softirq_continue |
| 33 | nop |
| 34 | __handle_preemption: |
| 35 | call schedule |
| 36 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 37 | ba,pt %xcc, __handle_preemption_continue |
| 38 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 39 | |
| 40 | __handle_user_windows: |
| 41 | call fault_in_user_windows |
| 42 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 43 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 44 | /* Redo sched+sig checks */ |
| 45 | ldx [%g6 + TI_FLAGS], %l0 |
| 46 | andcc %l0, _TIF_NEED_RESCHED, %g0 |
| 47 | |
| 48 | be,pt %xcc, 1f |
| 49 | nop |
| 50 | call schedule |
| 51 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 52 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 53 | ldx [%g6 + TI_FLAGS], %l0 |
| 54 | |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 55 | 1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | be,pt %xcc, __handle_user_windows_continue |
| 57 | nop |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 58 | mov %l5, %o1 |
| 59 | mov %l6, %o2 |
| 60 | add %sp, PTREGS_OFF, %o0 |
| 61 | mov %l0, %o3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | call do_notify_resume |
| 64 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 65 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 66 | clr %l6 |
| 67 | /* Signal delivery can modify pt_regs tstate, so we must |
| 68 | * reload it. |
| 69 | */ |
| 70 | ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 |
| 71 | sethi %hi(0xf << 20), %l4 |
| 72 | and %l1, %l4, %l4 |
| 73 | ba,pt %xcc, __handle_user_windows_continue |
| 74 | |
| 75 | andn %l1, %l4, %l1 |
| 76 | __handle_perfctrs: |
| 77 | call update_perfctrs |
| 78 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 79 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 80 | ldub [%g6 + TI_WSAVED], %o2 |
| 81 | brz,pt %o2, 1f |
| 82 | nop |
| 83 | /* Redo userwin+sched+sig checks */ |
| 84 | call fault_in_user_windows |
| 85 | |
| 86 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 87 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 88 | ldx [%g6 + TI_FLAGS], %l0 |
| 89 | andcc %l0, _TIF_NEED_RESCHED, %g0 |
| 90 | be,pt %xcc, 1f |
| 91 | |
| 92 | nop |
| 93 | call schedule |
| 94 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 95 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 96 | ldx [%g6 + TI_FLAGS], %l0 |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 97 | 1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
| 99 | be,pt %xcc, __handle_perfctrs_continue |
| 100 | sethi %hi(TSTATE_PEF), %o0 |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 101 | mov %l5, %o1 |
| 102 | mov %l6, %o2 |
| 103 | add %sp, PTREGS_OFF, %o0 |
| 104 | mov %l0, %o3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | call do_notify_resume |
| 106 | |
| 107 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 108 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 109 | clr %l6 |
| 110 | /* Signal delivery can modify pt_regs tstate, so we must |
| 111 | * reload it. |
| 112 | */ |
| 113 | ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 |
| 114 | sethi %hi(0xf << 20), %l4 |
| 115 | and %l1, %l4, %l4 |
| 116 | andn %l1, %l4, %l1 |
| 117 | ba,pt %xcc, __handle_perfctrs_continue |
| 118 | |
| 119 | sethi %hi(TSTATE_PEF), %o0 |
| 120 | __handle_userfpu: |
| 121 | rd %fprs, %l5 |
| 122 | andcc %l5, FPRS_FEF, %g0 |
| 123 | sethi %hi(TSTATE_PEF), %o0 |
| 124 | be,a,pn %icc, __handle_userfpu_continue |
| 125 | andn %l1, %o0, %l1 |
| 126 | ba,a,pt %xcc, __handle_userfpu_continue |
| 127 | |
| 128 | __handle_signal: |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 129 | mov %l5, %o1 |
| 130 | mov %l6, %o2 |
| 131 | add %sp, PTREGS_OFF, %o0 |
| 132 | mov %l0, %o3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | call do_notify_resume |
| 134 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 135 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 136 | clr %l6 |
| 137 | |
| 138 | /* Signal delivery can modify pt_regs tstate, so we must |
| 139 | * reload it. |
| 140 | */ |
| 141 | ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 |
| 142 | sethi %hi(0xf << 20), %l4 |
| 143 | and %l1, %l4, %l4 |
| 144 | ba,pt %xcc, __handle_signal_continue |
| 145 | andn %l1, %l4, %l1 |
| 146 | |
| 147 | .align 64 |
| 148 | .globl rtrap_irq, rtrap_clr_l6, rtrap, irqsz_patchme, rtrap_xcall |
| 149 | rtrap_irq: |
| 150 | rtrap_clr_l6: clr %l6 |
| 151 | rtrap: |
David S. Miller | d7ce78f | 2005-08-29 22:46:43 -0700 | [diff] [blame] | 152 | #ifndef CONFIG_SMP |
| 153 | sethi %hi(per_cpu____cpu_data), %l0 |
| 154 | lduw [%l0 + %lo(per_cpu____cpu_data)], %l1 |
| 155 | #else |
| 156 | sethi %hi(per_cpu____cpu_data), %l0 |
| 157 | or %l0, %lo(per_cpu____cpu_data), %l0 |
| 158 | lduw [%l0 + %g5], %l1 |
| 159 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | cmp %l1, 0 |
| 161 | |
| 162 | /* mm/ultra.S:xcall_report_regs KNOWS about this load. */ |
| 163 | bne,pn %icc, __handle_softirq |
| 164 | ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 |
| 165 | __handle_softirq_continue: |
| 166 | rtrap_xcall: |
| 167 | sethi %hi(0xf << 20), %l4 |
| 168 | andcc %l1, TSTATE_PRIV, %l3 |
| 169 | and %l1, %l4, %l4 |
| 170 | bne,pn %icc, to_kernel |
| 171 | andn %l1, %l4, %l1 |
| 172 | |
| 173 | /* We must hold IRQs off and atomically test schedule+signal |
| 174 | * state, then hold them off all the way back to userspace. |
| 175 | * If we are returning to kernel, none of this matters. |
| 176 | * |
| 177 | * If we do not do this, there is a window where we would do |
| 178 | * the tests, later the signal/resched event arrives but we do |
| 179 | * not process it since we are still in kernel mode. It would |
| 180 | * take until the next local IRQ before the signal/resched |
| 181 | * event would be handled. |
| 182 | * |
| 183 | * This also means that if we have to deal with performance |
| 184 | * counters or user windows, we have to redo all of these |
| 185 | * sched+signal checks with IRQs disabled. |
| 186 | */ |
| 187 | to_user: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
| 188 | wrpr 0, %pil |
| 189 | __handle_preemption_continue: |
| 190 | ldx [%g6 + TI_FLAGS], %l0 |
| 191 | sethi %hi(_TIF_USER_WORK_MASK), %o0 |
| 192 | or %o0, %lo(_TIF_USER_WORK_MASK), %o0 |
| 193 | andcc %l0, %o0, %g0 |
| 194 | sethi %hi(TSTATE_PEF), %o0 |
| 195 | be,pt %xcc, user_nowork |
| 196 | andcc %l1, %o0, %g0 |
| 197 | andcc %l0, _TIF_NEED_RESCHED, %g0 |
| 198 | bne,pn %xcc, __handle_preemption |
David S. Miller | 2d7d5f0 | 2006-01-19 02:42:49 -0800 | [diff] [blame] | 199 | andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | bne,pn %xcc, __handle_signal |
| 201 | __handle_signal_continue: |
| 202 | ldub [%g6 + TI_WSAVED], %o2 |
| 203 | brnz,pn %o2, __handle_user_windows |
| 204 | nop |
| 205 | __handle_user_windows_continue: |
| 206 | ldx [%g6 + TI_FLAGS], %l5 |
| 207 | andcc %l5, _TIF_PERFCTR, %g0 |
| 208 | sethi %hi(TSTATE_PEF), %o0 |
| 209 | bne,pn %xcc, __handle_perfctrs |
| 210 | __handle_perfctrs_continue: |
| 211 | andcc %l1, %o0, %g0 |
| 212 | |
| 213 | /* This fpdepth clear is necessary for non-syscall rtraps only */ |
| 214 | user_nowork: |
| 215 | bne,pn %xcc, __handle_userfpu |
| 216 | stb %g0, [%g6 + TI_FPDEPTH] |
| 217 | __handle_userfpu_continue: |
| 218 | |
| 219 | rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1 |
| 220 | ldx [%sp + PTREGS_OFF + PT_V9_G2], %g2 |
| 221 | |
| 222 | ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3 |
| 223 | ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4 |
| 224 | ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5 |
David S. Miller | 56fb4df | 2006-02-26 23:24:22 -0800 | [diff] [blame] | 225 | brz,pt %l3, 1f |
David S. Miller | 314981a | 2006-02-05 21:59:03 -0800 | [diff] [blame] | 226 | mov %g6, %l2 |
| 227 | |
David S. Miller | 56fb4df | 2006-02-26 23:24:22 -0800 | [diff] [blame] | 228 | /* Must do this before thread reg is clobbered below. */ |
David S. Miller | ffe483d | 2006-02-02 21:55:10 -0800 | [diff] [blame] | 229 | LOAD_PER_CPU_BASE(%g5, %g6, %i0, %i1, %i2) |
David S. Miller | 74bf431 | 2006-01-31 18:29:18 -0800 | [diff] [blame] | 230 | 1: |
| 231 | ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7 |
David S. Miller | 936f482 | 2006-02-05 21:29:28 -0800 | [diff] [blame] | 233 | |
| 234 | /* Normal globals are restored, go to trap globals. */ |
| 235 | 661: wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate |
David S. Miller | af02bec | 2006-02-16 16:23:45 -0800 | [diff] [blame] | 236 | nop |
| 237 | .section .sun4v_2insn_patch, "ax" |
David S. Miller | 936f482 | 2006-02-05 21:29:28 -0800 | [diff] [blame] | 238 | .word 661b |
David S. Miller | af02bec | 2006-02-16 16:23:45 -0800 | [diff] [blame] | 239 | wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
David S. Miller | 936f482 | 2006-02-05 21:29:28 -0800 | [diff] [blame] | 240 | SET_GL(1) |
| 241 | .previous |
| 242 | |
David S. Miller | 314981a | 2006-02-05 21:59:03 -0800 | [diff] [blame] | 243 | mov %l2, %g6 |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0 |
| 246 | ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1 |
| 247 | |
| 248 | ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2 |
| 249 | ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3 |
| 250 | ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4 |
| 251 | ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5 |
| 252 | ldx [%sp + PTREGS_OFF + PT_V9_I6], %i6 |
| 253 | ldx [%sp + PTREGS_OFF + PT_V9_I7], %i7 |
| 254 | ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2 |
| 255 | ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2 |
| 256 | |
| 257 | ld [%sp + PTREGS_OFF + PT_V9_Y], %o3 |
| 258 | wr %o3, %g0, %y |
| 259 | srl %l4, 20, %l4 |
| 260 | wrpr %l4, 0x0, %pil |
| 261 | wrpr %g0, 0x1, %tl |
| 262 | wrpr %l1, %g0, %tstate |
| 263 | wrpr %l2, %g0, %tpc |
| 264 | wrpr %o2, %g0, %tnpc |
| 265 | |
| 266 | brnz,pn %l3, kern_rtt |
| 267 | mov PRIMARY_CONTEXT, %l7 |
David S. Miller | 8b11bd1 | 2006-02-07 22:13:05 -0800 | [diff] [blame] | 268 | |
| 269 | 661: ldxa [%l7 + %l7] ASI_DMMU, %l0 |
| 270 | .section .sun4v_1insn_patch, "ax" |
| 271 | .word 661b |
| 272 | ldxa [%l7 + %l7] ASI_MMU, %l0 |
| 273 | .previous |
| 274 | |
David S. Miller | 0835ae0 | 2005-10-04 15:23:20 -0700 | [diff] [blame] | 275 | sethi %hi(sparc64_kern_pri_nuc_bits), %l1 |
| 276 | ldx [%l1 + %lo(sparc64_kern_pri_nuc_bits)], %l1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | or %l0, %l1, %l0 |
David S. Miller | 8b11bd1 | 2006-02-07 22:13:05 -0800 | [diff] [blame] | 278 | |
| 279 | 661: stxa %l0, [%l7] ASI_DMMU |
| 280 | .section .sun4v_1insn_patch, "ax" |
| 281 | .word 661b |
| 282 | stxa %l0, [%l7] ASI_MMU |
| 283 | .previous |
| 284 | |
David S. Miller | 4da808c | 2006-01-31 18:33:00 -0800 | [diff] [blame] | 285 | sethi %hi(KERNBASE), %l7 |
| 286 | flush %l7 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | rdpr %wstate, %l1 |
| 288 | rdpr %otherwin, %l2 |
| 289 | srl %l1, 3, %l1 |
| 290 | |
| 291 | wrpr %l2, %g0, %canrestore |
| 292 | wrpr %l1, %g0, %wstate |
David S. Miller | 314ef68 | 2006-02-04 00:10:01 -0800 | [diff] [blame] | 293 | brnz,pt %l2, user_rtt_restore |
| 294 | wrpr %g0, %g0, %otherwin |
| 295 | |
| 296 | ldx [%g6 + TI_FLAGS], %g3 |
| 297 | wr %g0, ASI_AIUP, %asi |
| 298 | rdpr %cwp, %g1 |
| 299 | andcc %g3, _TIF_32BIT, %g0 |
| 300 | sub %g1, 1, %g1 |
| 301 | bne,pt %xcc, user_rtt_fill_32bit |
| 302 | wrpr %g1, %cwp |
| 303 | ba,a,pt %xcc, user_rtt_fill_64bit |
| 304 | |
| 305 | user_rtt_fill_fixup: |
| 306 | rdpr %cwp, %g1 |
| 307 | add %g1, 1, %g1 |
| 308 | wrpr %g1, 0x0, %cwp |
| 309 | |
| 310 | rdpr %wstate, %g2 |
| 311 | sll %g2, 3, %g2 |
| 312 | wrpr %g2, 0x0, %wstate |
| 313 | |
| 314 | /* We know %canrestore and %otherwin are both zero. */ |
| 315 | |
| 316 | sethi %hi(sparc64_kern_pri_context), %g2 |
| 317 | ldx [%g2 + %lo(sparc64_kern_pri_context)], %g2 |
| 318 | mov PRIMARY_CONTEXT, %g1 |
David S. Miller | 8b11bd1 | 2006-02-07 22:13:05 -0800 | [diff] [blame] | 319 | |
| 320 | 661: stxa %g2, [%g1] ASI_DMMU |
| 321 | .section .sun4v_1insn_patch, "ax" |
| 322 | .word 661b |
| 323 | stxa %g2, [%g1] ASI_MMU |
| 324 | .previous |
| 325 | |
David S. Miller | 314ef68 | 2006-02-04 00:10:01 -0800 | [diff] [blame] | 326 | sethi %hi(KERNBASE), %g1 |
| 327 | flush %g1 |
| 328 | |
| 329 | or %g4, FAULT_CODE_WINFIXUP, %g4 |
| 330 | stb %g4, [%g6 + TI_FAULT_CODE] |
| 331 | stx %g5, [%g6 + TI_FAULT_ADDR] |
| 332 | |
| 333 | mov %g6, %l1 |
| 334 | wrpr %g0, 0x0, %tl |
David S. Miller | 936f482 | 2006-02-05 21:29:28 -0800 | [diff] [blame] | 335 | |
| 336 | 661: nop |
David S. Miller | df7d6ae | 2006-02-07 00:00:16 -0800 | [diff] [blame] | 337 | .section .sun4v_1insn_patch, "ax" |
David S. Miller | 936f482 | 2006-02-05 21:29:28 -0800 | [diff] [blame] | 338 | .word 661b |
| 339 | SET_GL(0) |
| 340 | .previous |
| 341 | |
David S. Miller | fc50492 | 2006-02-22 16:15:45 -0800 | [diff] [blame] | 342 | wrpr %g0, RTRAP_PSTATE, %pstate |
| 343 | |
David S. Miller | 314ef68 | 2006-02-04 00:10:01 -0800 | [diff] [blame] | 344 | mov %l1, %g6 |
| 345 | ldx [%g6 + TI_TASK], %g4 |
| 346 | LOAD_PER_CPU_BASE(%g5, %g6, %g1, %g2, %g3) |
| 347 | call do_sparc64_fault |
| 348 | add %sp, PTREGS_OFF, %o0 |
| 349 | ba,pt %xcc, rtrap |
| 350 | nop |
| 351 | |
| 352 | user_rtt_pre_restore: |
| 353 | add %g1, 1, %g1 |
| 354 | wrpr %g1, 0x0, %cwp |
| 355 | |
| 356 | user_rtt_restore: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | restore |
| 358 | rdpr %canrestore, %g1 |
| 359 | wrpr %g1, 0x0, %cleanwin |
| 360 | retry |
| 361 | nop |
| 362 | |
David S. Miller | 314ef68 | 2006-02-04 00:10:01 -0800 | [diff] [blame] | 363 | kern_rtt: rdpr %canrestore, %g1 |
| 364 | brz,pn %g1, kern_rtt_fill |
| 365 | nop |
| 366 | kern_rtt_restore: |
| 367 | restore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | retry |
David S. Miller | 314ef68 | 2006-02-04 00:10:01 -0800 | [diff] [blame] | 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | to_kernel: |
| 371 | #ifdef CONFIG_PREEMPT |
| 372 | ldsw [%g6 + TI_PRE_COUNT], %l5 |
| 373 | brnz %l5, kern_fpucheck |
| 374 | ldx [%g6 + TI_FLAGS], %l5 |
| 375 | andcc %l5, _TIF_NEED_RESCHED, %g0 |
| 376 | be,pt %xcc, kern_fpucheck |
| 377 | srl %l4, 20, %l5 |
| 378 | cmp %l5, 0 |
| 379 | bne,pn %xcc, kern_fpucheck |
| 380 | sethi %hi(PREEMPT_ACTIVE), %l6 |
| 381 | stw %l6, [%g6 + TI_PRE_COUNT] |
| 382 | call schedule |
| 383 | nop |
| 384 | ba,pt %xcc, rtrap |
| 385 | stw %g0, [%g6 + TI_PRE_COUNT] |
| 386 | #endif |
| 387 | kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5 |
| 388 | brz,pt %l5, rt_continue |
| 389 | srl %l5, 1, %o0 |
| 390 | add %g6, TI_FPSAVED, %l6 |
| 391 | ldub [%l6 + %o0], %l2 |
| 392 | sub %l5, 2, %l5 |
| 393 | |
| 394 | add %g6, TI_GSR, %o1 |
| 395 | andcc %l2, (FPRS_FEF|FPRS_DU), %g0 |
| 396 | be,pt %icc, 2f |
| 397 | and %l2, FPRS_DL, %l6 |
| 398 | andcc %l2, FPRS_FEF, %g0 |
| 399 | be,pn %icc, 5f |
| 400 | sll %o0, 3, %o5 |
| 401 | rd %fprs, %g1 |
| 402 | |
| 403 | wr %g1, FPRS_FEF, %fprs |
| 404 | ldx [%o1 + %o5], %g1 |
| 405 | add %g6, TI_XFSR, %o1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | sll %o0, 8, %o2 |
| 407 | add %g6, TI_FPREGS, %o3 |
| 408 | brz,pn %l6, 1f |
| 409 | add %g6, TI_FPREGS+0x40, %o4 |
| 410 | |
David S. Miller | ba639933 | 2005-10-07 13:30:49 -0700 | [diff] [blame] | 411 | membar #Sync |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | ldda [%o3 + %o2] ASI_BLK_P, %f0 |
| 413 | ldda [%o4 + %o2] ASI_BLK_P, %f16 |
David S. Miller | ba639933 | 2005-10-07 13:30:49 -0700 | [diff] [blame] | 414 | membar #Sync |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | 1: andcc %l2, FPRS_DU, %g0 |
| 416 | be,pn %icc, 1f |
| 417 | wr %g1, 0, %gsr |
| 418 | add %o2, 0x80, %o2 |
David S. Miller | ba639933 | 2005-10-07 13:30:49 -0700 | [diff] [blame] | 419 | membar #Sync |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | ldda [%o3 + %o2] ASI_BLK_P, %f32 |
| 421 | ldda [%o4 + %o2] ASI_BLK_P, %f48 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | 1: membar #Sync |
| 423 | ldx [%o1 + %o5], %fsr |
| 424 | 2: stb %l5, [%g6 + TI_FPDEPTH] |
| 425 | ba,pt %xcc, rt_continue |
| 426 | nop |
| 427 | 5: wr %g0, FPRS_FEF, %fprs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | sll %o0, 8, %o2 |
| 429 | |
| 430 | add %g6, TI_FPREGS+0x80, %o3 |
| 431 | add %g6, TI_FPREGS+0xc0, %o4 |
David S. Miller | ba639933 | 2005-10-07 13:30:49 -0700 | [diff] [blame] | 432 | membar #Sync |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | ldda [%o3 + %o2] ASI_BLK_P, %f32 |
| 434 | ldda [%o4 + %o2] ASI_BLK_P, %f48 |
| 435 | membar #Sync |
| 436 | wr %g0, FPRS_DU, %fprs |
| 437 | ba,pt %xcc, rt_continue |
| 438 | stb %l5, [%g6 + TI_FPDEPTH] |