1 /* SPDX-License-Identifier: GPL-2.0-only */ !! 1 /* arch/sparc/kernel/entry.S: Sparc trap low-level entry points.
2 /* !! 2 *
3 * Copyright (C) 2012 Regents of the Universit !! 3 * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 2017 SiFive !! 4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
>> 5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
>> 6 * Copyright (C) 1996-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
>> 7 * Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
5 */ 8 */
6 9
7 #include <linux/init.h> <<
8 #include <linux/linkage.h> 10 #include <linux/linkage.h>
>> 11 #include <linux/errno.h>
9 12
10 #include <asm/asm.h> !! 13 #include <asm/head.h>
11 #include <asm/csr.h> !! 14 #include <asm/asi.h>
12 #include <asm/scs.h> !! 15 #include <asm/smp.h>
13 #include <asm/unistd.h> !! 16 #include <asm/contregs.h>
>> 17 #include <asm/ptrace.h>
>> 18 #include <asm/asm-offsets.h>
>> 19 #include <asm/psr.h>
>> 20 #include <asm/vaddrs.h>
14 #include <asm/page.h> 21 #include <asm/page.h>
>> 22 #include <asm/pgtable.h>
>> 23 #include <asm/winmacro.h>
>> 24 #include <asm/signal.h>
>> 25 #include <asm/obio.h>
>> 26 #include <asm/mxcc.h>
15 #include <asm/thread_info.h> 27 #include <asm/thread_info.h>
16 #include <asm/asm-offsets.h> !! 28 #include <asm/param.h>
17 #include <asm/errata_list.h> !! 29 #include <asm/unistd.h>
18 #include <linux/sizes.h> !! 30
>> 31 #include <asm/asmmacro.h>
19 32
20 .section .irqentry.text, "ax" !! 33 #define curptr g6
21 34
22 .macro new_vmalloc_check !! 35 /* These are just handy. */
23 REG_S a0, TASK_TI_A0(tp) !! 36 #define _SV save %sp, -STACKFRAME_SZ, %sp
24 csrr a0, CSR_CAUSE !! 37 #define _RS restore
25 /* Exclude IRQs */ !! 38
26 blt a0, zero, _new_vmalloc_restore !! 39 #define FLUSH_ALL_KERNEL_WINDOWS \
27 !! 40 _SV; _SV; _SV; _SV; _SV; _SV; _SV; \
28 REG_S a1, TASK_TI_A1(tp) !! 41 _RS; _RS; _RS; _RS; _RS; _RS; _RS;
29 /* Only check new_vmalloc if we are in !! 42
30 li a1, EXC_LOAD_PAGE_FAULT !! 43 .text
31 beq a0, a1, _new_vmalloc_kernel_ad !! 44
32 li a1, EXC_STORE_PAGE_FAULT !! 45 #ifdef CONFIG_KGDB
33 beq a0, a1, _new_vmalloc_kernel_ad !! 46 .align 4
34 li a1, EXC_INST_PAGE_FAULT !! 47 .globl arch_kgdb_breakpoint
35 bne a0, a1, _new_vmalloc_restore_c !! 48 .type arch_kgdb_breakpoint,#function
36 !! 49 arch_kgdb_breakpoint:
37 _new_vmalloc_kernel_address: !! 50 ta 0x7d
38 /* Is it a kernel address? */ !! 51 retl
39 csrr a0, CSR_TVAL !! 52 nop
40 bge a0, zero, _new_vmalloc_restore !! 53 .size arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
>> 54 #endif
41 55
42 /* Check if a new vmalloc mapping appe !! 56 #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
43 REG_S a2, TASK_TI_A2(tp) !! 57 .align 4
>> 58 .globl floppy_hardint
>> 59 floppy_hardint:
44 /* 60 /*
45 * Computes: !! 61 * This code cannot touch registers %l0 %l1 and %l2
46 * a0 = &new_vmalloc[BIT_WORD(cpu)] !! 62 * because SAVE_ALL depends on their values. It depends
47 * a1 = BIT_MASK(cpu) !! 63 * on %l3 also, but we regenerate it before a call.
>> 64 * Other registers are:
>> 65 * %l3 -- base address of fdc registers
>> 66 * %l4 -- pdma_vaddr
>> 67 * %l5 -- scratch for ld/st address
>> 68 * %l6 -- pdma_size
>> 69 * %l7 -- scratch [floppy byte, ld/st address, aux. data]
48 */ 70 */
49 REG_L a2, TASK_TI_CPU(tp) !! 71
50 /* !! 72 /* Do we have work to do? */
51 * Compute the new_vmalloc element pos !! 73 sethi %hi(doing_pdma), %l7
52 * (cpu / 64) * 8 = (cpu >> 6) << 3 !! 74 ld [%l7 + %lo(doing_pdma)], %l7
>> 75 cmp %l7, 0
>> 76 be floppy_dosoftint
>> 77 nop
>> 78
>> 79 /* Load fdc register base */
>> 80 sethi %hi(fdc_status), %l3
>> 81 ld [%l3 + %lo(fdc_status)], %l3
>> 82
>> 83 /* Setup register addresses */
>> 84 sethi %hi(pdma_vaddr), %l5 ! transfer buffer
>> 85 ld [%l5 + %lo(pdma_vaddr)], %l4
>> 86 sethi %hi(pdma_size), %l5 ! bytes to go
>> 87 ld [%l5 + %lo(pdma_size)], %l6
>> 88 next_byte:
>> 89 ldub [%l3], %l7
>> 90
>> 91 andcc %l7, 0x80, %g0 ! Does fifo still have data
>> 92 bz floppy_fifo_emptied ! fifo has been emptied...
>> 93 andcc %l7, 0x20, %g0 ! in non-dma mode still?
>> 94 bz floppy_overrun ! nope, overrun
>> 95 andcc %l7, 0x40, %g0 ! 0=write 1=read
>> 96 bz floppy_write
>> 97 sub %l6, 0x1, %l6
>> 98
>> 99 /* Ok, actually read this byte */
>> 100 ldub [%l3 + 1], %l7
>> 101 orcc %g0, %l6, %g0
>> 102 stb %l7, [%l4]
>> 103 bne next_byte
>> 104 add %l4, 0x1, %l4
>> 105
>> 106 b floppy_tdone
>> 107 nop
>> 108
>> 109 floppy_write:
>> 110 /* Ok, actually write this byte */
>> 111 ldub [%l4], %l7
>> 112 orcc %g0, %l6, %g0
>> 113 stb %l7, [%l3 + 1]
>> 114 bne next_byte
>> 115 add %l4, 0x1, %l4
>> 116
>> 117 /* fall through... */
>> 118 floppy_tdone:
>> 119 sethi %hi(pdma_vaddr), %l5
>> 120 st %l4, [%l5 + %lo(pdma_vaddr)]
>> 121 sethi %hi(pdma_size), %l5
>> 122 st %l6, [%l5 + %lo(pdma_size)]
>> 123 /* Flip terminal count pin */
>> 124 set auxio_register, %l7
>> 125 ld [%l7], %l7
>> 126
>> 127 ldub [%l7], %l5
>> 128
>> 129 or %l5, 0xc2, %l5
>> 130 stb %l5, [%l7]
>> 131 andn %l5, 0x02, %l5
>> 132
>> 133 2:
>> 134 /* Kill some time so the bits set */
>> 135 WRITE_PAUSE
>> 136 WRITE_PAUSE
>> 137
>> 138 stb %l5, [%l7]
>> 139
>> 140 /* Prevent recursion */
>> 141 sethi %hi(doing_pdma), %l7
>> 142 b floppy_dosoftint
>> 143 st %g0, [%l7 + %lo(doing_pdma)]
>> 144
>> 145 /* We emptied the FIFO, but we haven't read everything
>> 146 * as of yet. Store the current transfer address and
>> 147 * bytes left to read so we can continue when the next
>> 148 * fast IRQ comes in.
53 */ 149 */
54 srli a1, a2, 6 !! 150 floppy_fifo_emptied:
55 slli a1, a1, 3 !! 151 sethi %hi(pdma_vaddr), %l5
56 la a0, new_vmalloc !! 152 st %l4, [%l5 + %lo(pdma_vaddr)]
57 add a0, a0, a1 !! 153 sethi %hi(pdma_size), %l7
58 /* !! 154 st %l6, [%l7 + %lo(pdma_size)]
59 * Compute the bit position in the new !! 155
60 * bit_pos = cpu % 64 = cpu - (cpu / 6 !! 156 /* Restore condition codes */
61 * = cpu - ((cpu >> 6) << 3) < !! 157 wr %l0, 0x0, %psr
62 */ !! 158 WRITE_PAUSE
63 slli a1, a1, 3 !! 159
64 sub a1, a2, a1 !! 160 jmp %l1
65 /* Compute the "get mask": 1 << bit_po !! 161 rett %l2
66 li a2, 1 !! 162
67 sll a1, a2, a1 !! 163 floppy_overrun:
68 !! 164 sethi %hi(pdma_vaddr), %l5
69 /* Check the value of new_vmalloc for !! 165 st %l4, [%l5 + %lo(pdma_vaddr)]
70 REG_L a2, 0(a0) !! 166 sethi %hi(pdma_size), %l5
71 and a2, a2, a1 !! 167 st %l6, [%l5 + %lo(pdma_size)]
72 beq a2, zero, _new_vmalloc_restore !! 168 /* Prevent recursion */
73 !! 169 sethi %hi(doing_pdma), %l7
74 /* Atomically reset the current cpu bi !! 170 st %g0, [%l7 + %lo(doing_pdma)]
75 amoxor.d a0, a1, (a0) !! 171
76 !! 172 /* fall through... */
77 /* Only emit a sfence.vma if the uarch !! 173 floppy_dosoftint:
78 ALTERNATIVE("sfence.vma", "nop", 0, RI !! 174 rd %wim, %l3
79 !! 175 SAVE_ALL
80 REG_L a0, TASK_TI_A0(tp) !! 176
81 REG_L a1, TASK_TI_A1(tp) !! 177 /* Set all IRQs off. */
82 REG_L a2, TASK_TI_A2(tp) !! 178 or %l0, PSR_PIL, %l4
83 csrw CSR_SCRATCH, x0 !! 179 wr %l4, 0x0, %psr
84 sret !! 180 WRITE_PAUSE
85 !! 181 wr %l4, PSR_ET, %psr
86 _new_vmalloc_restore_context: !! 182 WRITE_PAUSE
87 REG_L a2, TASK_TI_A2(tp) !! 183
88 _new_vmalloc_restore_context_a1: !! 184 mov 11, %o0 ! floppy irq level (unused anyway)
89 REG_L a1, TASK_TI_A1(tp) !! 185 mov %g0, %o1 ! devid is not used in fast interrupts
90 _new_vmalloc_restore_context_a0: !! 186 call sparc_floppy_irq
91 REG_L a0, TASK_TI_A0(tp) !! 187 add %sp, STACKFRAME_SZ, %o2 ! struct pt_regs *regs
92 .endm !! 188
>> 189 RESTORE_ALL
>> 190
>> 191 #endif /* (CONFIG_BLK_DEV_FD) */
>> 192
>> 193 /* Bad trap handler */
>> 194 .globl bad_trap_handler
>> 195 bad_trap_handler:
>> 196 SAVE_ALL
>> 197
>> 198 wr %l0, PSR_ET, %psr
>> 199 WRITE_PAUSE
>> 200
>> 201 add %sp, STACKFRAME_SZ, %o0 ! pt_regs
>> 202 call do_hw_interrupt
>> 203 mov %l7, %o1 ! trap number
>> 204
>> 205 RESTORE_ALL
>> 206
>> 207 /* For now all IRQ's not registered get sent here. handler_irq() will
>> 208 * see if a routine is registered to handle this interrupt and if not
>> 209 * it will say so on the console.
>> 210 */
93 211
>> 212 .align 4
>> 213 .globl real_irq_entry, patch_handler_irq
>> 214 real_irq_entry:
>> 215 SAVE_ALL
>> 216
>> 217 #ifdef CONFIG_SMP
>> 218 .globl patchme_maybe_smp_msg
>> 219
>> 220 cmp %l7, 11
>> 221 patchme_maybe_smp_msg:
>> 222 bgu maybe_smp4m_msg
>> 223 nop
>> 224 #endif
94 225
95 SYM_CODE_START(handle_exception) !! 226 real_irq_continue:
96 /* !! 227 or %l0, PSR_PIL, %g2
97 * If coming from userspace, preserve !! 228 wr %g2, 0x0, %psr
98 * the kernel thread pointer. If we c !! 229 WRITE_PAUSE
99 * register will contain 0, and we sho !! 230 wr %g2, PSR_ET, %psr
>> 231 WRITE_PAUSE
>> 232 mov %l7, %o0 ! irq level
>> 233 patch_handler_irq:
>> 234 call handler_irq
>> 235 add %sp, STACKFRAME_SZ, %o1 ! pt_regs ptr
>> 236 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
>> 237 wr %g2, PSR_ET, %psr ! keep ET up
>> 238 WRITE_PAUSE
>> 239
>> 240 RESTORE_ALL
>> 241
>> 242 #ifdef CONFIG_SMP
>> 243 /* SMP per-cpu ticker interrupts are handled specially. */
>> 244 smp4m_ticker:
>> 245 bne real_irq_continue+4
>> 246 or %l0, PSR_PIL, %g2
>> 247 wr %g2, 0x0, %psr
>> 248 WRITE_PAUSE
>> 249 wr %g2, PSR_ET, %psr
>> 250 WRITE_PAUSE
>> 251 call smp4m_percpu_timer_interrupt
>> 252 add %sp, STACKFRAME_SZ, %o0
>> 253 wr %l0, PSR_ET, %psr
>> 254 WRITE_PAUSE
>> 255 RESTORE_ALL
>> 256
>> 257 #define GET_PROCESSOR4M_ID(reg) \
>> 258 rd %tbr, %reg; \
>> 259 srl %reg, 12, %reg; \
>> 260 and %reg, 3, %reg;
>> 261
>> 262 /* Here is where we check for possible SMP IPI passed to us
>> 263 * on some level other than 15 which is the NMI and only used
>> 264 * for cross calls. That has a separate entry point below.
>> 265 *
>> 266 * IPIs are sent on Level 12, 13 and 14. See IRQ_IPI_*.
100 */ 267 */
101 csrrw tp, CSR_SCRATCH, tp !! 268 maybe_smp4m_msg:
102 bnez tp, .Lsave_context !! 269 GET_PROCESSOR4M_ID(o3)
>> 270 sethi %hi(sun4m_irq_percpu), %l5
>> 271 sll %o3, 2, %o3
>> 272 or %l5, %lo(sun4m_irq_percpu), %o5
>> 273 sethi %hi(0x70000000), %o2 ! Check all soft-IRQs
>> 274 ld [%o5 + %o3], %o1
>> 275 ld [%o1 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
>> 276 andcc %o3, %o2, %g0
>> 277 be,a smp4m_ticker
>> 278 cmp %l7, 14
>> 279 /* Soft-IRQ IPI */
>> 280 st %o2, [%o1 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x70000000
>> 281 WRITE_PAUSE
>> 282 ld [%o1 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
>> 283 WRITE_PAUSE
>> 284 or %l0, PSR_PIL, %l4
>> 285 wr %l4, 0x0, %psr
>> 286 WRITE_PAUSE
>> 287 wr %l4, PSR_ET, %psr
>> 288 WRITE_PAUSE
>> 289 srl %o3, 28, %o2 ! shift for simpler checks below
>> 290 maybe_smp4m_msg_check_single:
>> 291 andcc %o2, 0x1, %g0
>> 292 beq,a maybe_smp4m_msg_check_mask
>> 293 andcc %o2, 0x2, %g0
>> 294 call smp_call_function_single_interrupt
>> 295 nop
>> 296 andcc %o2, 0x2, %g0
>> 297 maybe_smp4m_msg_check_mask:
>> 298 beq,a maybe_smp4m_msg_check_resched
>> 299 andcc %o2, 0x4, %g0
>> 300 call smp_call_function_interrupt
>> 301 nop
>> 302 andcc %o2, 0x4, %g0
>> 303 maybe_smp4m_msg_check_resched:
>> 304 /* rescheduling is done in RESTORE_ALL regardless, but incr stats */
>> 305 beq,a maybe_smp4m_msg_out
>> 306 nop
>> 307 call smp_resched_interrupt
>> 308 nop
>> 309 maybe_smp4m_msg_out:
>> 310 RESTORE_ALL
>> 311
>> 312 .align 4
>> 313 .globl linux_trap_ipi15_sun4m
>> 314 linux_trap_ipi15_sun4m:
>> 315 SAVE_ALL
>> 316 sethi %hi(0x80000000), %o2
>> 317 GET_PROCESSOR4M_ID(o0)
>> 318 sethi %hi(sun4m_irq_percpu), %l5
>> 319 or %l5, %lo(sun4m_irq_percpu), %o5
>> 320 sll %o0, 2, %o0
>> 321 ld [%o5 + %o0], %o5
>> 322 ld [%o5 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
>> 323 andcc %o3, %o2, %g0
>> 324 be sun4m_nmi_error ! Must be an NMI async memory error
>> 325 st %o2, [%o5 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x80000000
>> 326 WRITE_PAUSE
>> 327 ld [%o5 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
>> 328 WRITE_PAUSE
>> 329 or %l0, PSR_PIL, %l4
>> 330 wr %l4, 0x0, %psr
>> 331 WRITE_PAUSE
>> 332 wr %l4, PSR_ET, %psr
>> 333 WRITE_PAUSE
>> 334 call smp4m_cross_call_irq
>> 335 nop
>> 336 b ret_trap_lockless_ipi
>> 337 clr %l6
>> 338
>> 339 .globl smp4d_ticker
>> 340 /* SMP per-cpu ticker interrupts are handled specially. */
>> 341 smp4d_ticker:
>> 342 SAVE_ALL
>> 343 or %l0, PSR_PIL, %g2
>> 344 sethi %hi(CC_ICLR), %o0
>> 345 sethi %hi(1 << 14), %o1
>> 346 or %o0, %lo(CC_ICLR), %o0
>> 347 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 14 in MXCC's ICLR */
>> 348 wr %g2, 0x0, %psr
>> 349 WRITE_PAUSE
>> 350 wr %g2, PSR_ET, %psr
>> 351 WRITE_PAUSE
>> 352 call smp4d_percpu_timer_interrupt
>> 353 add %sp, STACKFRAME_SZ, %o0
>> 354 wr %l0, PSR_ET, %psr
>> 355 WRITE_PAUSE
>> 356 RESTORE_ALL
>> 357
>> 358 .align 4
>> 359 .globl linux_trap_ipi15_sun4d
>> 360 linux_trap_ipi15_sun4d:
>> 361 SAVE_ALL
>> 362 sethi %hi(CC_BASE), %o4
>> 363 sethi %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
>> 364 or %o4, (CC_EREG - CC_BASE), %o0
>> 365 ldda [%o0] ASI_M_MXCC, %o0
>> 366 andcc %o0, %o2, %g0
>> 367 bne 1f
>> 368 sethi %hi(BB_STAT2), %o2
>> 369 lduba [%o2] ASI_M_CTL, %o2
>> 370 andcc %o2, BB_STAT2_MASK, %g0
>> 371 bne 2f
>> 372 or %o4, (CC_ICLR - CC_BASE), %o0
>> 373 sethi %hi(1 << 15), %o1
>> 374 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 15 in MXCC's ICLR */
>> 375 or %l0, PSR_PIL, %l4
>> 376 wr %l4, 0x0, %psr
>> 377 WRITE_PAUSE
>> 378 wr %l4, PSR_ET, %psr
>> 379 WRITE_PAUSE
>> 380 call smp4d_cross_call_irq
>> 381 nop
>> 382 b ret_trap_lockless_ipi
>> 383 clr %l6
>> 384
>> 385 1: /* MXCC error */
>> 386 2: /* BB error */
>> 387 /* Disable PIL 15 */
>> 388 set CC_IMSK, %l4
>> 389 lduha [%l4] ASI_M_MXCC, %l5
>> 390 sethi %hi(1 << 15), %l7
>> 391 or %l5, %l7, %l5
>> 392 stha %l5, [%l4] ASI_M_MXCC
>> 393 /* FIXME */
>> 394 1: b,a 1b
>> 395
>> 396 .globl smpleon_ipi
>> 397 .extern leon_ipi_interrupt
>> 398 /* SMP per-cpu IPI interrupts are handled specially. */
>> 399 smpleon_ipi:
>> 400 SAVE_ALL
>> 401 or %l0, PSR_PIL, %g2
>> 402 wr %g2, 0x0, %psr
>> 403 WRITE_PAUSE
>> 404 wr %g2, PSR_ET, %psr
>> 405 WRITE_PAUSE
>> 406 call leonsmp_ipi_interrupt
>> 407 add %sp, STACKFRAME_SZ, %o1 ! pt_regs
>> 408 wr %l0, PSR_ET, %psr
>> 409 WRITE_PAUSE
>> 410 RESTORE_ALL
>> 411
>> 412 .align 4
>> 413 .globl linux_trap_ipi15_leon
>> 414 linux_trap_ipi15_leon:
>> 415 SAVE_ALL
>> 416 or %l0, PSR_PIL, %l4
>> 417 wr %l4, 0x0, %psr
>> 418 WRITE_PAUSE
>> 419 wr %l4, PSR_ET, %psr
>> 420 WRITE_PAUSE
>> 421 call leon_cross_call_irq
>> 422 nop
>> 423 b ret_trap_lockless_ipi
>> 424 clr %l6
103 425
104 .Lrestore_kernel_tpsp: !! 426 #endif /* CONFIG_SMP */
105 csrr tp, CSR_SCRATCH <<
106 427
107 #ifdef CONFIG_64BIT !! 428 /* This routine handles illegal instructions and privileged
108 /* !! 429 * instruction attempts from user code.
109 * The RISC-V kernel does not eagerly <<
110 * new vmalloc mapping, which may resu <<
111 * - if the uarch caches invalid entri <<
112 * observed by the page table walker <<
113 * - if the uarch does not cache inval <<
114 * could "miss" the new mapping and <<
115 * to retry the access, no sfence.vm <<
116 */ 430 */
117 new_vmalloc_check !! 431 .align 4
118 #endif !! 432 .globl bad_instruction
>> 433 bad_instruction:
>> 434 sethi %hi(0xc1f80000), %l4
>> 435 ld [%l1], %l5
>> 436 sethi %hi(0x81d80000), %l7
>> 437 and %l5, %l4, %l5
>> 438 cmp %l5, %l7
>> 439 be 1f
>> 440 SAVE_ALL
>> 441
>> 442 wr %l0, PSR_ET, %psr ! re-enable traps
>> 443 WRITE_PAUSE
>> 444
>> 445 add %sp, STACKFRAME_SZ, %o0
>> 446 mov %l1, %o1
>> 447 mov %l2, %o2
>> 448 call do_illegal_instruction
>> 449 mov %l0, %o3
>> 450
>> 451 RESTORE_ALL
>> 452
>> 453 1: /* unimplemented flush - just skip */
>> 454 jmpl %l2, %g0
>> 455 rett %l2 + 4
>> 456
>> 457 .align 4
>> 458 .globl priv_instruction
>> 459 priv_instruction:
>> 460 SAVE_ALL
>> 461
>> 462 wr %l0, PSR_ET, %psr
>> 463 WRITE_PAUSE
>> 464
>> 465 add %sp, STACKFRAME_SZ, %o0
>> 466 mov %l1, %o1
>> 467 mov %l2, %o2
>> 468 call do_priv_instruction
>> 469 mov %l0, %o3
>> 470
>> 471 RESTORE_ALL
>> 472
>> 473 /* This routine handles unaligned data accesses. */
>> 474 .align 4
>> 475 .globl mna_handler
>> 476 mna_handler:
>> 477 andcc %l0, PSR_PS, %g0
>> 478 be mna_fromuser
>> 479 nop
>> 480
>> 481 SAVE_ALL
>> 482
>> 483 wr %l0, PSR_ET, %psr
>> 484 WRITE_PAUSE
>> 485
>> 486 ld [%l1], %o1
>> 487 call kernel_unaligned_trap
>> 488 add %sp, STACKFRAME_SZ, %o0
>> 489
>> 490 RESTORE_ALL
>> 491
>> 492 mna_fromuser:
>> 493 SAVE_ALL
>> 494
>> 495 wr %l0, PSR_ET, %psr ! re-enable traps
>> 496 WRITE_PAUSE
>> 497
>> 498 ld [%l1], %o1
>> 499 call user_unaligned_trap
>> 500 add %sp, STACKFRAME_SZ, %o0
>> 501
>> 502 RESTORE_ALL
>> 503
>> 504 /* This routine handles floating point disabled traps. */
>> 505 .align 4
>> 506 .globl fpd_trap_handler
>> 507 fpd_trap_handler:
>> 508 SAVE_ALL
>> 509
>> 510 wr %l0, PSR_ET, %psr ! re-enable traps
>> 511 WRITE_PAUSE
>> 512
>> 513 add %sp, STACKFRAME_SZ, %o0
>> 514 mov %l1, %o1
>> 515 mov %l2, %o2
>> 516 call do_fpd_trap
>> 517 mov %l0, %o3
>> 518
>> 519 RESTORE_ALL
>> 520
>> 521 /* This routine handles Floating Point Exceptions. */
>> 522 .align 4
>> 523 .globl fpe_trap_handler
>> 524 fpe_trap_handler:
>> 525 set fpsave_magic, %l5
>> 526 cmp %l1, %l5
>> 527 be 1f
>> 528 sethi %hi(fpsave), %l5
>> 529 or %l5, %lo(fpsave), %l5
>> 530 cmp %l1, %l5
>> 531 bne 2f
>> 532 sethi %hi(fpsave_catch2), %l5
>> 533 or %l5, %lo(fpsave_catch2), %l5
>> 534 wr %l0, 0x0, %psr
>> 535 WRITE_PAUSE
>> 536 jmp %l5
>> 537 rett %l5 + 4
>> 538 1:
>> 539 sethi %hi(fpsave_catch), %l5
>> 540 or %l5, %lo(fpsave_catch), %l5
>> 541 wr %l0, 0x0, %psr
>> 542 WRITE_PAUSE
>> 543 jmp %l5
>> 544 rett %l5 + 4
>> 545
>> 546 2:
>> 547 SAVE_ALL
>> 548
>> 549 wr %l0, PSR_ET, %psr ! re-enable traps
>> 550 WRITE_PAUSE
>> 551
>> 552 add %sp, STACKFRAME_SZ, %o0
>> 553 mov %l1, %o1
>> 554 mov %l2, %o2
>> 555 call do_fpe_trap
>> 556 mov %l0, %o3
>> 557
>> 558 RESTORE_ALL
>> 559
>> 560 /* This routine handles Tag Overflow Exceptions. */
>> 561 .align 4
>> 562 .globl do_tag_overflow
>> 563 do_tag_overflow:
>> 564 SAVE_ALL
>> 565
>> 566 wr %l0, PSR_ET, %psr ! re-enable traps
>> 567 WRITE_PAUSE
>> 568
>> 569 add %sp, STACKFRAME_SZ, %o0
>> 570 mov %l1, %o1
>> 571 mov %l2, %o2
>> 572 call handle_tag_overflow
>> 573 mov %l0, %o3
>> 574
>> 575 RESTORE_ALL
>> 576
>> 577 /* This routine handles Watchpoint Exceptions. */
>> 578 .align 4
>> 579 .globl do_watchpoint
>> 580 do_watchpoint:
>> 581 SAVE_ALL
>> 582
>> 583 wr %l0, PSR_ET, %psr ! re-enable traps
>> 584 WRITE_PAUSE
>> 585
>> 586 add %sp, STACKFRAME_SZ, %o0
>> 587 mov %l1, %o1
>> 588 mov %l2, %o2
>> 589 call handle_watchpoint
>> 590 mov %l0, %o3
>> 591
>> 592 RESTORE_ALL
>> 593
>> 594 /* This routine handles Register Access Exceptions. */
>> 595 .align 4
>> 596 .globl do_reg_access
>> 597 do_reg_access:
>> 598 SAVE_ALL
>> 599
>> 600 wr %l0, PSR_ET, %psr ! re-enable traps
>> 601 WRITE_PAUSE
>> 602
>> 603 add %sp, STACKFRAME_SZ, %o0
>> 604 mov %l1, %o1
>> 605 mov %l2, %o2
>> 606 call handle_reg_access
>> 607 mov %l0, %o3
>> 608
>> 609 RESTORE_ALL
>> 610
>> 611 /* This routine handles Co-Processor Disabled Exceptions. */
>> 612 .align 4
>> 613 .globl do_cp_disabled
>> 614 do_cp_disabled:
>> 615 SAVE_ALL
>> 616
>> 617 wr %l0, PSR_ET, %psr ! re-enable traps
>> 618 WRITE_PAUSE
>> 619
>> 620 add %sp, STACKFRAME_SZ, %o0
>> 621 mov %l1, %o1
>> 622 mov %l2, %o2
>> 623 call handle_cp_disabled
>> 624 mov %l0, %o3
>> 625
>> 626 RESTORE_ALL
>> 627
>> 628 /* This routine handles Co-Processor Exceptions. */
>> 629 .align 4
>> 630 .globl do_cp_exception
>> 631 do_cp_exception:
>> 632 SAVE_ALL
>> 633
>> 634 wr %l0, PSR_ET, %psr ! re-enable traps
>> 635 WRITE_PAUSE
>> 636
>> 637 add %sp, STACKFRAME_SZ, %o0
>> 638 mov %l1, %o1
>> 639 mov %l2, %o2
>> 640 call handle_cp_exception
>> 641 mov %l0, %o3
>> 642
>> 643 RESTORE_ALL
>> 644
>> 645 /* This routine handles Hardware Divide By Zero Exceptions. */
>> 646 .align 4
>> 647 .globl do_hw_divzero
>> 648 do_hw_divzero:
>> 649 SAVE_ALL
>> 650
>> 651 wr %l0, PSR_ET, %psr ! re-enable traps
>> 652 WRITE_PAUSE
>> 653
>> 654 add %sp, STACKFRAME_SZ, %o0
>> 655 mov %l1, %o1
>> 656 mov %l2, %o2
>> 657 call handle_hw_divzero
>> 658 mov %l0, %o3
>> 659
>> 660 RESTORE_ALL
>> 661
>> 662 .align 4
>> 663 .globl do_flush_windows
>> 664 do_flush_windows:
>> 665 SAVE_ALL
>> 666
>> 667 wr %l0, PSR_ET, %psr
>> 668 WRITE_PAUSE
>> 669
>> 670 andcc %l0, PSR_PS, %g0
>> 671 bne dfw_kernel
>> 672 nop
>> 673
>> 674 call flush_user_windows
>> 675 nop
>> 676
>> 677 /* Advance over the trap instruction. */
>> 678 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
>> 679 add %l1, 0x4, %l2
>> 680 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 681 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 682
>> 683 RESTORE_ALL
>> 684
>> 685 .globl flush_patch_one
>> 686
>> 687 /* We get these for debugging routines using __builtin_return_address() */
>> 688 dfw_kernel:
>> 689 flush_patch_one:
>> 690 FLUSH_ALL_KERNEL_WINDOWS
>> 691
>> 692 /* Advance over the trap instruction. */
>> 693 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
>> 694 add %l1, 0x4, %l2
>> 695 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 696 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
119 697
120 REG_S sp, TASK_TI_KERNEL_SP(tp) !! 698 RESTORE_ALL
121 699
122 #ifdef CONFIG_VMAP_STACK !! 700 /* The getcc software trap. The user wants the condition codes from
123 addi sp, sp, -(PT_SIZE_ON_STACK) !! 701 * the %psr in register %g1.
124 srli sp, sp, THREAD_SHIFT !! 702 */
125 andi sp, sp, 0x1 <<
126 bnez sp, handle_kernel_stack_overflow <<
127 REG_L sp, TASK_TI_KERNEL_SP(tp) <<
128 #endif <<
129 703
130 .Lsave_context: !! 704 .align 4
131 REG_S sp, TASK_TI_USER_SP(tp) !! 705 .globl getcc_trap_handler
132 REG_L sp, TASK_TI_KERNEL_SP(tp) !! 706 getcc_trap_handler:
133 addi sp, sp, -(PT_SIZE_ON_STACK) !! 707 srl %l0, 20, %g1 ! give user
134 REG_S x1, PT_RA(sp) !! 708 and %g1, 0xf, %g1 ! only ICC bits in %psr
135 REG_S x3, PT_GP(sp) !! 709 jmp %l2 ! advance over trap instruction
136 REG_S x5, PT_T0(sp) !! 710 rett %l2 + 0x4 ! like this...
137 save_from_x6_to_x31 !! 711
>> 712 /* The setcc software trap. The user has condition codes in %g1
>> 713 * that it would like placed in the %psr. Be careful not to flip
>> 714 * any unintentional bits!
>> 715 */
138 716
139 /* !! 717 .align 4
140 * Disable user-mode memory access as !! 718 .globl setcc_trap_handler
141 * actual user copy routines. !! 719 setcc_trap_handler:
>> 720 sll %g1, 0x14, %l4
>> 721 set PSR_ICC, %l5
>> 722 andn %l0, %l5, %l0 ! clear ICC bits in %psr
>> 723 and %l4, %l5, %l4 ! clear non-ICC bits in user value
>> 724 or %l4, %l0, %l4 ! or them in... mix mix mix
>> 725
>> 726 wr %l4, 0x0, %psr ! set new %psr
>> 727 WRITE_PAUSE ! TI scumbags...
>> 728
>> 729 jmp %l2 ! advance over trap instruction
>> 730 rett %l2 + 0x4 ! like this...
>> 731
>> 732 sun4m_nmi_error:
>> 733 /* NMI async memory error handling. */
>> 734 sethi %hi(0x80000000), %l4
>> 735 sethi %hi(sun4m_irq_global), %o5
>> 736 ld [%o5 + %lo(sun4m_irq_global)], %l5
>> 737 st %l4, [%l5 + 0x0c] ! sun4m_irq_global->mask_set=0x80000000
>> 738 WRITE_PAUSE
>> 739 ld [%l5 + 0x00], %g0 ! sun4m_irq_global->pending
>> 740 WRITE_PAUSE
>> 741 or %l0, PSR_PIL, %l4
>> 742 wr %l4, 0x0, %psr
>> 743 WRITE_PAUSE
>> 744 wr %l4, PSR_ET, %psr
>> 745 WRITE_PAUSE
>> 746 call sun4m_nmi
>> 747 nop
>> 748 st %l4, [%l5 + 0x08] ! sun4m_irq_global->mask_clear=0x80000000
>> 749 WRITE_PAUSE
>> 750 ld [%l5 + 0x00], %g0 ! sun4m_irq_global->pending
>> 751 WRITE_PAUSE
>> 752 RESTORE_ALL
>> 753
>> 754 #ifndef CONFIG_SMP
>> 755 .align 4
>> 756 .globl linux_trap_ipi15_sun4m
>> 757 linux_trap_ipi15_sun4m:
>> 758 SAVE_ALL
>> 759
>> 760 ba sun4m_nmi_error
>> 761 nop
>> 762 #endif /* CONFIG_SMP */
>> 763
>> 764 .align 4
>> 765 .globl srmmu_fault
>> 766 srmmu_fault:
>> 767 mov 0x400, %l5
>> 768 mov 0x300, %l4
>> 769
>> 770 LEON_PI(lda [%l5] ASI_LEON_MMUREGS, %l6) ! read sfar first
>> 771 SUN_PI_(lda [%l5] ASI_M_MMUREGS, %l6) ! read sfar first
>> 772
>> 773 LEON_PI(lda [%l4] ASI_LEON_MMUREGS, %l5) ! read sfsr last
>> 774 SUN_PI_(lda [%l4] ASI_M_MMUREGS, %l5) ! read sfsr last
>> 775
>> 776 andn %l6, 0xfff, %l6
>> 777 srl %l5, 6, %l5 ! and encode all info into l7
>> 778
>> 779 and %l5, 2, %l5
>> 780 or %l5, %l6, %l6
>> 781
>> 782 or %l6, %l7, %l7 ! l7 = [addr,write,txtfault]
>> 783
>> 784 SAVE_ALL
>> 785
>> 786 mov %l7, %o1
>> 787 mov %l7, %o2
>> 788 and %o1, 1, %o1 ! arg2 = text_faultp
>> 789 mov %l7, %o3
>> 790 and %o2, 2, %o2 ! arg3 = writep
>> 791 andn %o3, 0xfff, %o3 ! arg4 = faulting address
>> 792
>> 793 wr %l0, PSR_ET, %psr
>> 794 WRITE_PAUSE
>> 795
>> 796 call do_sparc_fault
>> 797 add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
>> 798
>> 799 RESTORE_ALL
>> 800
>> 801 .align 4
>> 802 .globl sys_nis_syscall
>> 803 sys_nis_syscall:
>> 804 mov %o7, %l5
>> 805 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
>> 806 call c_sys_nis_syscall
>> 807 mov %l5, %o7
>> 808
>> 809 sunos_execv:
>> 810 .globl sunos_execv
>> 811 b sys_execve
>> 812 clr %i2
>> 813
>> 814 .align 4
>> 815 .globl sys_sparc_pipe
>> 816 sys_sparc_pipe:
>> 817 mov %o7, %l5
>> 818 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
>> 819 call sparc_pipe
>> 820 mov %l5, %o7
>> 821
>> 822 .align 4
>> 823 .globl sys_sigstack
>> 824 sys_sigstack:
>> 825 mov %o7, %l5
>> 826 mov %fp, %o2
>> 827 call do_sys_sigstack
>> 828 mov %l5, %o7
>> 829
>> 830 .align 4
>> 831 .globl sys_sigreturn
>> 832 sys_sigreturn:
>> 833 call do_sigreturn
>> 834 add %sp, STACKFRAME_SZ, %o0
>> 835
>> 836 ld [%curptr + TI_FLAGS], %l5
>> 837 andcc %l5, _TIF_SYSCALL_TRACE, %g0
>> 838 be 1f
>> 839 nop
>> 840
>> 841 call syscall_trace
>> 842 mov 1, %o1
>> 843
>> 844 1:
>> 845 /* We don't want to muck with user registers like a
>> 846 * normal syscall, just return.
>> 847 */
>> 848 RESTORE_ALL
>> 849
>> 850 .align 4
>> 851 .globl sys_rt_sigreturn
>> 852 sys_rt_sigreturn:
>> 853 call do_rt_sigreturn
>> 854 add %sp, STACKFRAME_SZ, %o0
>> 855
>> 856 ld [%curptr + TI_FLAGS], %l5
>> 857 andcc %l5, _TIF_SYSCALL_TRACE, %g0
>> 858 be 1f
>> 859 nop
>> 860
>> 861 add %sp, STACKFRAME_SZ, %o0
>> 862 call syscall_trace
>> 863 mov 1, %o1
>> 864
>> 865 1:
>> 866 /* We are returning to a signal handler. */
>> 867 RESTORE_ALL
>> 868
>> 869 /* Now that we have a real sys_clone, sys_fork() is
>> 870 * implemented in terms of it. Our _real_ implementation
>> 871 * of SunOS vfork() will use sys_vfork().
142 * 872 *
143 * Disable the FPU/Vector to detect il !! 873 * XXX These three should be consolidated into mostly shared
144 * or vector in kernel space. !! 874 * XXX code just like on sparc64... -DaveM
145 */ 875 */
146 li t0, SR_SUM | SR_FS_VS !! 876 .align 4
>> 877 .globl sys_fork, flush_patch_two
>> 878 sys_fork:
>> 879 mov %o7, %l5
>> 880 flush_patch_two:
>> 881 FLUSH_ALL_KERNEL_WINDOWS;
>> 882 ld [%curptr + TI_TASK], %o4
>> 883 rd %psr, %g4
>> 884 WRITE_PAUSE
>> 885 mov SIGCHLD, %o0 ! arg0: clone flags
>> 886 rd %wim, %g5
>> 887 WRITE_PAUSE
>> 888 mov %fp, %o1 ! arg1: usp
>> 889 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
>> 890 add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
>> 891 mov 0, %o3
>> 892 call sparc_do_fork
>> 893 mov %l5, %o7
>> 894
>> 895 /* Whee, kernel threads! */
>> 896 .globl sys_clone, flush_patch_three
>> 897 sys_clone:
>> 898 mov %o7, %l5
>> 899 flush_patch_three:
>> 900 FLUSH_ALL_KERNEL_WINDOWS;
>> 901 ld [%curptr + TI_TASK], %o4
>> 902 rd %psr, %g4
>> 903 WRITE_PAUSE
>> 904
>> 905 /* arg0,1: flags,usp -- loaded already */
>> 906 cmp %o1, 0x0 ! Is new_usp NULL?
>> 907 rd %wim, %g5
>> 908 WRITE_PAUSE
>> 909 be,a 1f
>> 910 mov %fp, %o1 ! yes, use callers usp
>> 911 andn %o1, 7, %o1 ! no, align to 8 bytes
>> 912 1:
>> 913 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
>> 914 add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
>> 915 mov 0, %o3
>> 916 call sparc_do_fork
>> 917 mov %l5, %o7
>> 918
>> 919 /* Whee, real vfork! */
>> 920 .globl sys_vfork, flush_patch_four
>> 921 sys_vfork:
>> 922 flush_patch_four:
>> 923 FLUSH_ALL_KERNEL_WINDOWS;
>> 924 ld [%curptr + TI_TASK], %o4
>> 925 rd %psr, %g4
>> 926 WRITE_PAUSE
>> 927 rd %wim, %g5
>> 928 WRITE_PAUSE
>> 929 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
>> 930 sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
>> 931 mov %fp, %o1
>> 932 or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
>> 933 sethi %hi(sparc_do_fork), %l1
>> 934 mov 0, %o3
>> 935 jmpl %l1 + %lo(sparc_do_fork), %g0
>> 936 add %sp, STACKFRAME_SZ, %o2
>> 937
>> 938 .align 4
>> 939 linux_sparc_ni_syscall:
>> 940 sethi %hi(sys_ni_syscall), %l7
>> 941 b do_syscall
>> 942 or %l7, %lo(sys_ni_syscall), %l7
>> 943
>> 944 linux_syscall_trace:
>> 945 add %sp, STACKFRAME_SZ, %o0
>> 946 call syscall_trace
>> 947 mov 0, %o1
>> 948 cmp %o0, 0
>> 949 bne 3f
>> 950 mov -ENOSYS, %o0
>> 951
>> 952 /* Syscall tracing can modify the registers. */
>> 953 ld [%sp + STACKFRAME_SZ + PT_G1], %g1
>> 954 sethi %hi(sys_call_table), %l7
>> 955 ld [%sp + STACKFRAME_SZ + PT_I0], %i0
>> 956 or %l7, %lo(sys_call_table), %l7
>> 957 ld [%sp + STACKFRAME_SZ + PT_I1], %i1
>> 958 ld [%sp + STACKFRAME_SZ + PT_I2], %i2
>> 959 ld [%sp + STACKFRAME_SZ + PT_I3], %i3
>> 960 ld [%sp + STACKFRAME_SZ + PT_I4], %i4
>> 961 ld [%sp + STACKFRAME_SZ + PT_I5], %i5
>> 962 cmp %g1, NR_syscalls
>> 963 bgeu 3f
>> 964 mov -ENOSYS, %o0
>> 965
>> 966 sll %g1, 2, %l4
>> 967 mov %i0, %o0
>> 968 ld [%l7 + %l4], %l7
>> 969 mov %i1, %o1
>> 970 mov %i2, %o2
>> 971 mov %i3, %o3
>> 972 b 2f
>> 973 mov %i4, %o4
>> 974
>> 975 .globl ret_from_fork
>> 976 ret_from_fork:
>> 977 call schedule_tail
>> 978 ld [%g3 + TI_TASK], %o0
>> 979 b ret_sys_call
>> 980 ld [%sp + STACKFRAME_SZ + PT_I0], %o0
>> 981
>> 982 .globl ret_from_kernel_thread
>> 983 ret_from_kernel_thread:
>> 984 call schedule_tail
>> 985 ld [%g3 + TI_TASK], %o0
>> 986 ld [%sp + STACKFRAME_SZ + PT_G1], %l0
>> 987 call %l0
>> 988 ld [%sp + STACKFRAME_SZ + PT_G2], %o0
>> 989 rd %psr, %l1
>> 990 ld [%sp + STACKFRAME_SZ + PT_PSR], %l0
>> 991 andn %l0, PSR_CWP, %l0
>> 992 nop
>> 993 and %l1, PSR_CWP, %l1
>> 994 or %l0, %l1, %l0
>> 995 st %l0, [%sp + STACKFRAME_SZ + PT_PSR]
>> 996 b ret_sys_call
>> 997 mov 0, %o0
>> 998
>> 999 /* Linux native system calls enter here... */
>> 1000 .align 4
>> 1001 .globl linux_sparc_syscall
>> 1002 linux_sparc_syscall:
>> 1003 sethi %hi(PSR_SYSCALL), %l4
>> 1004 or %l0, %l4, %l0
>> 1005 /* Direct access to user regs, must faster. */
>> 1006 cmp %g1, NR_syscalls
>> 1007 bgeu linux_sparc_ni_syscall
>> 1008 sll %g1, 2, %l4
>> 1009 ld [%l7 + %l4], %l7
>> 1010
>> 1011 do_syscall:
>> 1012 SAVE_ALL_HEAD
>> 1013 rd %wim, %l3
>> 1014
>> 1015 wr %l0, PSR_ET, %psr
>> 1016 mov %i0, %o0
>> 1017 mov %i1, %o1
>> 1018 mov %i2, %o2
>> 1019
>> 1020 ld [%curptr + TI_FLAGS], %l5
>> 1021 mov %i3, %o3
>> 1022 andcc %l5, _TIF_SYSCALL_TRACE, %g0
>> 1023 mov %i4, %o4
>> 1024 bne linux_syscall_trace
>> 1025 mov %i0, %l5
>> 1026 2:
>> 1027 call %l7
>> 1028 mov %i5, %o5
147 1029
148 REG_L s0, TASK_TI_USER_SP(tp) !! 1030 3:
149 csrrc s1, CSR_STATUS, t0 !! 1031 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
150 csrr s2, CSR_EPC <<
151 csrr s3, CSR_TVAL <<
152 csrr s4, CSR_CAUSE <<
153 csrr s5, CSR_SCRATCH <<
154 REG_S s0, PT_SP(sp) <<
155 REG_S s1, PT_STATUS(sp) <<
156 REG_S s2, PT_EPC(sp) <<
157 REG_S s3, PT_BADADDR(sp) <<
158 REG_S s4, PT_CAUSE(sp) <<
159 REG_S s5, PT_TP(sp) <<
160 1032
161 /* !! 1033 ret_sys_call:
162 * Set the scratch register to 0, so t !! 1034 ld [%curptr + TI_FLAGS], %l6
163 * occurs, the exception vector knows !! 1035 cmp %o0, -ERESTART_RESTARTBLOCK
>> 1036 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
>> 1037 set PSR_C, %g2
>> 1038 bgeu 1f
>> 1039 andcc %l6, _TIF_SYSCALL_TRACE, %g0
>> 1040
>> 1041 /* System call success, clear Carry condition code. */
>> 1042 andn %g3, %g2, %g3
>> 1043 clr %l6
>> 1044 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1045 bne linux_syscall_trace2
>> 1046 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
>> 1047 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1048 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1049 b ret_trap_entry
>> 1050 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1051 1:
>> 1052 /* System call failure, set Carry condition code.
>> 1053 * Also, get abs(errno) to return to the process.
164 */ 1054 */
165 csrw CSR_SCRATCH, x0 !! 1055 sub %g0, %o0, %o0
>> 1056 or %g3, %g2, %g3
>> 1057 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
>> 1058 mov 1, %l6
>> 1059 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1060 bne linux_syscall_trace2
>> 1061 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
>> 1062 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1063 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1064 b ret_trap_entry
>> 1065 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1066
>> 1067 linux_syscall_trace2:
>> 1068 add %sp, STACKFRAME_SZ, %o0
>> 1069 mov 1, %o1
>> 1070 call syscall_trace
>> 1071 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1072 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1073 b ret_trap_entry
>> 1074 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
166 1075
167 /* Load the global pointer */ <<
168 load_global_pointer <<
169 1076
170 /* Load the kernel shadow call stack p !! 1077 /* Saving and restoring the FPU state is best done from lowlevel code.
171 scs_load_current_if_task_changed s5 !! 1078 *
>> 1079 * void fpsave(unsigned long *fpregs, unsigned long *fsr,
>> 1080 * void *fpqueue, unsigned long *fpqdepth)
>> 1081 */
172 1082
173 #ifdef CONFIG_RISCV_ISA_V_PREEMPTIVE !! 1083 .globl fpsave
174 move a0, sp !! 1084 fpsave:
175 call riscv_v_context_nesting_start !! 1085 st %fsr, [%o1] ! this can trap on us if fpu is in bogon state
176 #endif !! 1086 ld [%o1], %g1
177 move a0, sp /* pt_regs */ !! 1087 set 0x2000, %g4
>> 1088 andcc %g1, %g4, %g0
>> 1089 be 2f
>> 1090 mov 0, %g2
178 1091
179 /* !! 1092 /* We have an fpqueue to save. */
180 * MSB of cause differentiates between !! 1093 1:
181 * interrupts and exceptions !! 1094 std %fq, [%o2]
>> 1095 fpsave_magic:
>> 1096 st %fsr, [%o1]
>> 1097 ld [%o1], %g3
>> 1098 andcc %g3, %g4, %g0
>> 1099 add %g2, 1, %g2
>> 1100 bne 1b
>> 1101 add %o2, 8, %o2
>> 1102
>> 1103 2:
>> 1104 st %g2, [%o3]
>> 1105
>> 1106 std %f0, [%o0 + 0x00]
>> 1107 std %f2, [%o0 + 0x08]
>> 1108 std %f4, [%o0 + 0x10]
>> 1109 std %f6, [%o0 + 0x18]
>> 1110 std %f8, [%o0 + 0x20]
>> 1111 std %f10, [%o0 + 0x28]
>> 1112 std %f12, [%o0 + 0x30]
>> 1113 std %f14, [%o0 + 0x38]
>> 1114 std %f16, [%o0 + 0x40]
>> 1115 std %f18, [%o0 + 0x48]
>> 1116 std %f20, [%o0 + 0x50]
>> 1117 std %f22, [%o0 + 0x58]
>> 1118 std %f24, [%o0 + 0x60]
>> 1119 std %f26, [%o0 + 0x68]
>> 1120 std %f28, [%o0 + 0x70]
>> 1121 retl
>> 1122 std %f30, [%o0 + 0x78]
>> 1123
>> 1124 /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
>> 1125 * code for pointing out this possible deadlock, while we save state
>> 1126 * above we could trap on the fsr store so our low level fpu trap
>> 1127 * code has to know how to deal with this.
>> 1128 */
>> 1129 fpsave_catch:
>> 1130 b fpsave_magic + 4
>> 1131 st %fsr, [%o1]
>> 1132
>> 1133 fpsave_catch2:
>> 1134 b fpsave + 4
>> 1135 st %fsr, [%o1]
>> 1136
>> 1137 /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
>> 1138
>> 1139 .globl fpload
>> 1140 fpload:
>> 1141 ldd [%o0 + 0x00], %f0
>> 1142 ldd [%o0 + 0x08], %f2
>> 1143 ldd [%o0 + 0x10], %f4
>> 1144 ldd [%o0 + 0x18], %f6
>> 1145 ldd [%o0 + 0x20], %f8
>> 1146 ldd [%o0 + 0x28], %f10
>> 1147 ldd [%o0 + 0x30], %f12
>> 1148 ldd [%o0 + 0x38], %f14
>> 1149 ldd [%o0 + 0x40], %f16
>> 1150 ldd [%o0 + 0x48], %f18
>> 1151 ldd [%o0 + 0x50], %f20
>> 1152 ldd [%o0 + 0x58], %f22
>> 1153 ldd [%o0 + 0x60], %f24
>> 1154 ldd [%o0 + 0x68], %f26
>> 1155 ldd [%o0 + 0x70], %f28
>> 1156 ldd [%o0 + 0x78], %f30
>> 1157 ld [%o1], %fsr
>> 1158 retl
>> 1159 nop
>> 1160
>> 1161 /* __ndelay and __udelay take two arguments:
>> 1162 * 0 - nsecs or usecs to delay
>> 1163 * 1 - per_cpu udelay_val (loops per jiffy)
>> 1164 *
>> 1165 * Note that ndelay gives HZ times higher resolution but has a 10ms
>> 1166 * limit. udelay can handle up to 1s.
182 */ 1167 */
183 bge s4, zero, 1f !! 1168 .globl __ndelay
>> 1169 __ndelay:
>> 1170 save %sp, -STACKFRAME_SZ, %sp
>> 1171 mov %i0, %o0 ! round multiplier up so large ns ok
>> 1172 mov 0x1ae, %o1 ! 2**32 / (1 000 000 000 / HZ)
>> 1173 umul %o0, %o1, %o0
>> 1174 rd %y, %o1
>> 1175 mov %i1, %o1 ! udelay_val
>> 1176 umul %o0, %o1, %o0
>> 1177 rd %y, %o1
>> 1178 ba delay_continue
>> 1179 mov %o1, %o0 ! >>32 later for better resolution
>> 1180
>> 1181 .globl __udelay
>> 1182 __udelay:
>> 1183 save %sp, -STACKFRAME_SZ, %sp
>> 1184 mov %i0, %o0
>> 1185 sethi %hi(0x10c7), %o1 ! round multiplier up so large us ok
>> 1186 or %o1, %lo(0x10c7), %o1 ! 2**32 / 1 000 000
>> 1187 umul %o0, %o1, %o0
>> 1188 rd %y, %o1
>> 1189 mov %i1, %o1 ! udelay_val
>> 1190 umul %o0, %o1, %o0
>> 1191 rd %y, %o1
>> 1192 sethi %hi(0x028f4b62), %l0 ! Add in rounding constant * 2**32,
>> 1193 or %g0, %lo(0x028f4b62), %l0
>> 1194 addcc %o0, %l0, %o0 ! 2**32 * 0.009 999
>> 1195 bcs,a 3f
>> 1196 add %o1, 0x01, %o1
>> 1197 3:
>> 1198 mov HZ, %o0 ! >>32 earlier for wider range
>> 1199 umul %o0, %o1, %o0
>> 1200 rd %y, %o1
184 1201
185 /* Handle interrupts */ !! 1202 delay_continue:
186 call do_irq !! 1203 cmp %o0, 0x0
187 j ret_from_exception <<
188 1: 1204 1:
189 /* Handle other exceptions */ !! 1205 bne 1b
190 slli t0, s4, RISCV_LGPTR !! 1206 subcc %o0, 1, %o0
191 la t1, excp_vect_table !! 1207
192 la t2, excp_vect_table_end !! 1208 ret
193 add t0, t1, t0 !! 1209 restore
194 /* Check if exception code lies within <<
195 bgeu t0, t2, 3f <<
196 REG_L t1, 0(t0) <<
197 2: jalr t1 <<
198 j ret_from_exception <<
199 3: <<
200 1210
201 la t1, do_trap_unknown !! 1211 /* Handle a software breakpoint */
202 j 2b !! 1212 /* We have to inform parent that child has stopped */
203 SYM_CODE_END(handle_exception) !! 1213 .align 4
204 ASM_NOKPROBE(handle_exception) !! 1214 .globl breakpoint_trap
205 !! 1215 breakpoint_trap:
206 /* !! 1216 rd %wim,%l3
207 * The ret_from_exception must be called with !! 1217 SAVE_ALL
208 * caller list: !! 1218 wr %l0, PSR_ET, %psr
209 * - handle_exception !! 1219 WRITE_PAUSE
210 * - ret_from_fork !! 1220
211 */ !! 1221 st %i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
212 SYM_CODE_START_NOALIGN(ret_from_exception) !! 1222 call sparc_breakpoint
213 REG_L s0, PT_STATUS(sp) !! 1223 add %sp, STACKFRAME_SZ, %o0
214 #ifdef CONFIG_RISCV_M_MODE !! 1224
215 /* the MPP value is too large to be us !! 1225 RESTORE_ALL
216 li t0, SR_MPP !! 1226
217 and s0, s0, t0 !! 1227 #ifdef CONFIG_KGDB
218 #else !! 1228 .align 4
219 andi s0, s0, SR_SPP !! 1229 .globl kgdb_trap_low
220 #endif !! 1230 .type kgdb_trap_low,#function
221 bnez s0, 1f !! 1231 kgdb_trap_low:
>> 1232 rd %wim,%l3
>> 1233 SAVE_ALL
>> 1234 wr %l0, PSR_ET, %psr
>> 1235 WRITE_PAUSE
222 1236
223 #ifdef CONFIG_GCC_PLUGIN_STACKLEAK !! 1237 call kgdb_trap
224 call stackleak_erase_on_task_stack !! 1238 add %sp, STACKFRAME_SZ, %o0
>> 1239
>> 1240 RESTORE_ALL
>> 1241 .size kgdb_trap_low,.-kgdb_trap_low
225 #endif 1242 #endif
226 1243
227 /* Save unwound kernel stack pointer i !! 1244 .align 4
228 addi s0, sp, PT_SIZE_ON_STACK !! 1245 .globl flush_patch_exception
229 REG_S s0, TASK_TI_KERNEL_SP(tp) !! 1246 flush_patch_exception:
>> 1247 FLUSH_ALL_KERNEL_WINDOWS;
>> 1248 ldd [%o0], %o6
>> 1249 jmpl %o7 + 0xc, %g0 ! see asm-sparc/processor.h
>> 1250 mov 1, %g1 ! signal EFAULT condition
>> 1251
>> 1252 .align 4
>> 1253 .globl kill_user_windows, kuw_patch1_7win
>> 1254 .globl kuw_patch1
>> 1255 kuw_patch1_7win: sll %o3, 6, %o3
>> 1256
>> 1257 /* No matter how much overhead this routine has in the worst
>> 1258 * case scenerio, it is several times better than taking the
>> 1259 * traps with the old method of just doing flush_user_windows().
>> 1260 */
>> 1261 kill_user_windows:
>> 1262 ld [%g6 + TI_UWINMASK], %o0 ! get current umask
>> 1263 orcc %g0, %o0, %g0 ! if no bits set, we are done
>> 1264 be 3f ! nothing to do
>> 1265 rd %psr, %o5 ! must clear interrupts
>> 1266 or %o5, PSR_PIL, %o4 ! or else that could change
>> 1267 wr %o4, 0x0, %psr ! the uwinmask state
>> 1268 WRITE_PAUSE ! burn them cycles
>> 1269 1:
>> 1270 ld [%g6 + TI_UWINMASK], %o0 ! get consistent state
>> 1271 orcc %g0, %o0, %g0 ! did an interrupt come in?
>> 1272 be 4f ! yep, we are done
>> 1273 rd %wim, %o3 ! get current wim
>> 1274 srl %o3, 1, %o4 ! simulate a save
>> 1275 kuw_patch1:
>> 1276 sll %o3, 7, %o3 ! compute next wim
>> 1277 or %o4, %o3, %o3 ! result
>> 1278 andncc %o0, %o3, %o0 ! clean this bit in umask
>> 1279 bne kuw_patch1 ! not done yet
>> 1280 srl %o3, 1, %o4 ! begin another save simulation
>> 1281 wr %o3, 0x0, %wim ! set the new wim
>> 1282 st %g0, [%g6 + TI_UWINMASK] ! clear uwinmask
>> 1283 4:
>> 1284 wr %o5, 0x0, %psr ! re-enable interrupts
>> 1285 WRITE_PAUSE ! burn baby burn
>> 1286 3:
>> 1287 retl ! return
>> 1288 st %g0, [%g6 + TI_W_SAVED] ! no windows saved
230 1289
231 /* Save the kernel shadow call stack p !! 1290 .align 4
232 scs_save_current !! 1291 .globl restore_current
>> 1292 restore_current:
>> 1293 LOAD_CURRENT(g6, o0)
>> 1294 retl
>> 1295 nop
>> 1296
>> 1297 #ifdef CONFIG_PCIC_PCI
>> 1298 #include <asm/pcic.h>
>> 1299
>> 1300 .align 4
>> 1301 .globl linux_trap_ipi15_pcic
>> 1302 linux_trap_ipi15_pcic:
>> 1303 rd %wim, %l3
>> 1304 SAVE_ALL
233 1305
234 /* 1306 /*
235 * Save TP into the scratch register , !! 1307 * First deactivate NMI
236 * structures again. !! 1308 * or we cannot drop ET, cannot get window spill traps.
>> 1309 * The busy loop is necessary because the PIO error
>> 1310 * sometimes does not go away quickly and we trap again.
237 */ 1311 */
238 csrw CSR_SCRATCH, tp !! 1312 sethi %hi(pcic_regs), %o1
239 1: !! 1313 ld [%o1 + %lo(pcic_regs)], %o2
240 #ifdef CONFIG_RISCV_ISA_V_PREEMPTIVE <<
241 move a0, sp <<
242 call riscv_v_context_nesting_end <<
243 #endif <<
244 REG_L a0, PT_STATUS(sp) <<
245 /* <<
246 * The current load reservation is eff <<
247 * state, in the sense that load reser <<
248 * different hart contexts. We can't <<
249 * reservation, so instead here we cle <<
250 * it's always legal for implementatio <<
251 * any point (as long as the forward p <<
252 * we'll ignore that here). <<
253 * <<
254 * Dangling load reservations can be t <<
255 * middle of an LR/SC sequence, but ca <<
256 * forward branch around an SC -- whic <<
257 * result we need to clear reservation <<
258 * jump back to the new context. Whil <<
259 * completes, implementations are allo <<
260 * arbitrarily large. <<
261 */ <<
262 REG_L a2, PT_EPC(sp) <<
263 REG_SC x0, a2, PT_EPC(sp) <<
264 <<
265 csrw CSR_STATUS, a0 <<
266 csrw CSR_EPC, a2 <<
267 <<
268 REG_L x1, PT_RA(sp) <<
269 REG_L x3, PT_GP(sp) <<
270 REG_L x4, PT_TP(sp) <<
271 REG_L x5, PT_T0(sp) <<
272 restore_from_x6_to_x31 <<
273 <<
274 REG_L x2, PT_SP(sp) <<
275 <<
276 #ifdef CONFIG_RISCV_M_MODE <<
277 mret <<
278 #else <<
279 sret <<
280 #endif <<
281 SYM_CODE_END(ret_from_exception) <<
282 ASM_NOKPROBE(ret_from_exception) <<
283 1314
284 #ifdef CONFIG_VMAP_STACK !! 1315 ! Get pending status for printouts later.
285 SYM_CODE_START_LOCAL(handle_kernel_stack_overf !! 1316 ld [%o2 + PCI_SYS_INT_PENDING], %o0
286 /* we reach here from kernel context, <<
287 csrrw x31, CSR_SCRATCH, x31 <<
288 asm_per_cpu sp, overflow_stack, x31 <<
289 li x31, OVERFLOW_STACK_SIZE <<
290 add sp, sp, x31 <<
291 /* zero out x31 again and restore x31 <<
292 xor x31, x31, x31 <<
293 csrrw x31, CSR_SCRATCH, x31 <<
294 <<
295 addi sp, sp, -(PT_SIZE_ON_STACK) <<
296 <<
297 //save context to overflow stack <<
298 REG_S x1, PT_RA(sp) <<
299 REG_S x3, PT_GP(sp) <<
300 REG_S x5, PT_T0(sp) <<
301 save_from_x6_to_x31 <<
302 <<
303 REG_L s0, TASK_TI_KERNEL_SP(tp) <<
304 csrr s1, CSR_STATUS <<
305 csrr s2, CSR_EPC <<
306 csrr s3, CSR_TVAL <<
307 csrr s4, CSR_CAUSE <<
308 csrr s5, CSR_SCRATCH <<
309 REG_S s0, PT_SP(sp) <<
310 REG_S s1, PT_STATUS(sp) <<
311 REG_S s2, PT_EPC(sp) <<
312 REG_S s3, PT_BADADDR(sp) <<
313 REG_S s4, PT_CAUSE(sp) <<
314 REG_S s5, PT_TP(sp) <<
315 move a0, sp <<
316 tail handle_bad_stack <<
317 SYM_CODE_END(handle_kernel_stack_overflow) <<
318 ASM_NOKPROBE(handle_kernel_stack_overflow) <<
319 #endif <<
320 1317
321 SYM_CODE_START(ret_from_fork) !! 1318 mov PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
322 call schedule_tail !! 1319 stb %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
323 beqz s0, 1f /* not from kernel thr <<
324 /* Call fn(arg) */ <<
325 move a0, s1 <<
326 jalr s0 <<
327 1: 1320 1:
328 move a0, sp /* pt_regs */ !! 1321 ld [%o2 + PCI_SYS_INT_PENDING], %o1
329 call syscall_exit_to_user_mode !! 1322 andcc %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
330 j ret_from_exception !! 1323 bne 1b
331 SYM_CODE_END(ret_from_fork) !! 1324 nop
332 !! 1325
333 #ifdef CONFIG_IRQ_STACKS !! 1326 or %l0, PSR_PIL, %l4
334 /* !! 1327 wr %l4, 0x0, %psr
335 * void call_on_irq_stack(struct pt_regs *regs !! 1328 WRITE_PAUSE
336 * void (*func)(struct !! 1329 wr %l4, PSR_ET, %psr
337 * !! 1330 WRITE_PAUSE
338 * Calls func(regs) using the per-CPU IRQ stac !! 1331
339 */ !! 1332 call pcic_nmi
340 SYM_FUNC_START(call_on_irq_stack) !! 1333 add %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
341 /* Create a frame record to save ra an !! 1334 RESTORE_ALL
342 addi sp, sp, -STACKFRAME_SIZE_ON_ST !! 1335
343 REG_S ra, STACKFRAME_RA(sp) !! 1336 .globl pcic_nmi_trap_patch
344 REG_S s0, STACKFRAME_FP(sp) !! 1337 pcic_nmi_trap_patch:
345 addi s0, sp, STACKFRAME_SIZE_ON_STA !! 1338 sethi %hi(linux_trap_ipi15_pcic), %l3
346 !! 1339 jmpl %l3 + %lo(linux_trap_ipi15_pcic), %g0
347 /* Switch to the per-CPU shadow call s !! 1340 rd %psr, %l0
348 scs_save_current !! 1341 .word 0
349 scs_load_irq_stack t0 !! 1342
350 !! 1343 #endif /* CONFIG_PCIC_PCI */
351 /* Switch to the per-CPU IRQ stack and !! 1344
352 load_per_cpu t0, irq_stack_ptr, t1 !! 1345 .globl flushw_all
353 li t1, IRQ_STACK_SIZE !! 1346 flushw_all:
354 add sp, t0, t1 !! 1347 save %sp, -0x40, %sp
355 jalr a1 !! 1348 save %sp, -0x40, %sp
356 !! 1349 save %sp, -0x40, %sp
357 /* Switch back to the thread shadow ca !! 1350 save %sp, -0x40, %sp
358 scs_load_current !! 1351 save %sp, -0x40, %sp
359 !! 1352 save %sp, -0x40, %sp
360 /* Switch back to the thread stack and !! 1353 save %sp, -0x40, %sp
361 addi sp, s0, -STACKFRAME_SIZE_ON_ST !! 1354 restore
362 REG_L ra, STACKFRAME_RA(sp) !! 1355 restore
363 REG_L s0, STACKFRAME_FP(sp) !! 1356 restore
364 addi sp, sp, STACKFRAME_SIZE_ON_STA !! 1357 restore
365 !! 1358 restore
>> 1359 restore
366 ret 1360 ret
367 SYM_FUNC_END(call_on_irq_stack) !! 1361 restore
368 #endif /* CONFIG_IRQ_STACKS */ <<
369 1362
370 /* !! 1363 #ifdef CONFIG_SMP
371 * Integer register context switch !! 1364 ENTRY(hard_smp_processor_id)
372 * The callee-saved registers must be saved an !! 1365 661: rd %tbr, %g1
373 * !! 1366 srl %g1, 12, %o0
374 * a0: previous task_struct (must be preserv !! 1367 and %o0, 3, %o0
375 * a1: next task_struct !! 1368 .section .cpuid_patch, "ax"
376 * !! 1369 /* Instruction location. */
377 * The value of a0 and a1 must be preserved by !! 1370 .word 661b
378 * arguments are passed to schedule_tail. !! 1371 /* SUN4D implementation. */
379 */ !! 1372 lda [%g0] ASI_M_VIKING_TMP1, %o0
380 SYM_FUNC_START(__switch_to) !! 1373 nop
381 /* Save context into prev->thread */ !! 1374 nop
382 li a4, TASK_THREAD_RA !! 1375 /* LEON implementation. */
383 add a3, a0, a4 !! 1376 rd %asr17, %o0
384 add a4, a1, a4 !! 1377 srl %o0, 0x1c, %o0
385 REG_S ra, TASK_THREAD_RA_RA(a3) !! 1378 nop
386 REG_S sp, TASK_THREAD_SP_RA(a3) !! 1379 .previous
387 REG_S s0, TASK_THREAD_S0_RA(a3) !! 1380 retl
388 REG_S s1, TASK_THREAD_S1_RA(a3) !! 1381 nop
389 REG_S s2, TASK_THREAD_S2_RA(a3) !! 1382 ENDPROC(hard_smp_processor_id)
390 REG_S s3, TASK_THREAD_S3_RA(a3) <<
391 REG_S s4, TASK_THREAD_S4_RA(a3) <<
392 REG_S s5, TASK_THREAD_S5_RA(a3) <<
393 REG_S s6, TASK_THREAD_S6_RA(a3) <<
394 REG_S s7, TASK_THREAD_S7_RA(a3) <<
395 REG_S s8, TASK_THREAD_S8_RA(a3) <<
396 REG_S s9, TASK_THREAD_S9_RA(a3) <<
397 REG_S s10, TASK_THREAD_S10_RA(a3) <<
398 REG_S s11, TASK_THREAD_S11_RA(a3) <<
399 /* Save the kernel shadow call stack p <<
400 scs_save_current <<
401 /* Restore context from next->thread * <<
402 REG_L ra, TASK_THREAD_RA_RA(a4) <<
403 REG_L sp, TASK_THREAD_SP_RA(a4) <<
404 REG_L s0, TASK_THREAD_S0_RA(a4) <<
405 REG_L s1, TASK_THREAD_S1_RA(a4) <<
406 REG_L s2, TASK_THREAD_S2_RA(a4) <<
407 REG_L s3, TASK_THREAD_S3_RA(a4) <<
408 REG_L s4, TASK_THREAD_S4_RA(a4) <<
409 REG_L s5, TASK_THREAD_S5_RA(a4) <<
410 REG_L s6, TASK_THREAD_S6_RA(a4) <<
411 REG_L s7, TASK_THREAD_S7_RA(a4) <<
412 REG_L s8, TASK_THREAD_S8_RA(a4) <<
413 REG_L s9, TASK_THREAD_S9_RA(a4) <<
414 REG_L s10, TASK_THREAD_S10_RA(a4) <<
415 REG_L s11, TASK_THREAD_S11_RA(a4) <<
416 /* The offset of thread_info in task_s <<
417 move tp, a1 <<
418 /* Switch to the next shadow call stac <<
419 scs_load_current <<
420 ret <<
421 SYM_FUNC_END(__switch_to) <<
422 <<
423 #ifndef CONFIG_MMU <<
424 #define do_page_fault do_trap_unknown <<
425 #endif 1383 #endif
426 1384
427 .section ".rodata" !! 1385 /* End of entry.S */
428 .align LGREG <<
429 /* Exception vector table */ <<
430 SYM_DATA_START_LOCAL(excp_vect_table) <<
431 RISCV_PTR do_trap_insn_misaligned <<
432 ALT_INSN_FAULT(RISCV_PTR do_trap_insn_ <<
433 RISCV_PTR do_trap_insn_illegal <<
434 RISCV_PTR do_trap_break <<
435 RISCV_PTR do_trap_load_misaligned <<
436 RISCV_PTR do_trap_load_fault <<
437 RISCV_PTR do_trap_store_misaligned <<
438 RISCV_PTR do_trap_store_fault <<
439 RISCV_PTR do_trap_ecall_u /* system ca <<
440 RISCV_PTR do_trap_ecall_s <<
441 RISCV_PTR do_trap_unknown <<
442 RISCV_PTR do_trap_ecall_m <<
443 /* instruciton page fault */ <<
444 ALT_PAGE_FAULT(RISCV_PTR do_page_fault <<
445 RISCV_PTR do_page_fault /* load page <<
446 RISCV_PTR do_trap_unknown <<
447 RISCV_PTR do_page_fault /* store pag <<
448 SYM_DATA_END_LABEL(excp_vect_table, SYM_L_LOCA <<
449 <<
450 #ifndef CONFIG_MMU <<
451 SYM_DATA_START(__user_rt_sigreturn) <<
452 li a7, __NR_rt_sigreturn <<
453 ecall <<
454 SYM_DATA_END(__user_rt_sigreturn) <<
455 #endif <<
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