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