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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 | /* * Low level exception handling * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1994, 1995 by Ralf Baechle * * $Id: entry.S,v 1.14 1999/04/12 19:13:21 harald Exp $ */ /* * entry.S contains the system-call and fault low-level handling routines. * This also contains the timer-interrupt handler, as well as all interrupts * and faults that can result in a task-switch. The ISA dependent TLB * code is in arch/mips/<ISA-level>/<cputype>.S */ #include <linux/config.h> #include <linux/sys.h> #include <asm/asm.h> #include <asm/current.h> #include <asm/errno.h> #include <asm/mipsregs.h> #include <asm/mipsconfig.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/stackframe.h> #include <asm/processor.h> #include <asm/regdef.h> #include <asm/fpregdef.h> #include <asm/unistd.h> /* * Heia ... The %lo, %hi and %HI stuff is too strong for the ELF assembler * and the ABI to cope with ... */ .text .set noreorder .set mips3 .align 4 EXPORT(handle_bottom_half) jal do_bottom_half nop b 9f nop reschedule: jal schedule nop EXPORT(ret_from_sys_call) EXPORT(ret_from_irq) lw t0,bh_mask lw t1,bh_active # unused delay slot and t0,t1 bnez t0,handle_bottom_half 9: lw t0,PT_STATUS(sp) # returning to kernel mode? andi t1, t0, 0x10 beqz t1, return # -> yes lw t1, TASK_NEED_RESCHED($28) bnez t1, reschedule lw v0, TASK_SIGPENDING($28) move a0, zero beqz v0, return nop jal do_signal move a1, sp EXPORT(return) .set noat RESTORE_ALL eret .set at /* * Common spurious interrupt handler. */ .text .align 5 LEAF(spurious_interrupt) /* * Someone tried to fool us by sending an interrupt but we * couldn't find a cause for it. */ lui t1,%hi(spurious_count) lw t0,%lo(spurious_count)(t1) addiu t0,1 j ret_from_irq sw t0,%lo(spurious_count)(t1) END(spurious_interrupt) /* * Build a default exception handler for the exceptions that don't need * special handlers. If you didn't know yet - I *like* playing games with * the C preprocessor ... */ #define __BUILD_clear_none(exception) #define __BUILD_clear_sti(exception) \ STI #define __BUILD_clear_cli(exception) \ CLI #define __BUILD_clear_fpe(exception) \ cfc1 a1,fcr31; \ li a2,~(0x3f<<12); \ and a2,a1; \ ctc1 a2,fcr31; \ STI #define __BUILD_clear_ade(exception) \ MFC0 t0,CP0_BADVADDR; \ REG_S t0,PT_BVADDR(sp); \ KMODE #define __BUILD_silent(exception) #define fmt "Got %s at %08lx.\n" #define __BUILD_verbose(exception) \ la a1,8f; \ TEXT (#exception); \ REG_L a2,PT_EPC(sp); \ PRINT(fmt) #define __BUILD_count(exception) \ .set reorder; \ lw t0,exception_count_##exception; \ addiu t0, 1; \ sw t0,exception_count_##exception; \ .set noreorder; \ .data; \ EXPORT(exception_count_##exception); \ .word 0; \ .previous; #define BUILD_HANDLER(exception,handler,clear,verbose) \ .align 5; \ NESTED(handle_##exception, PT_SIZE, sp); \ .set noat; \ SAVE_ALL; \ __BUILD_clear_##clear(exception); \ .set at; \ __BUILD_##verbose(exception); \ jal do_##handler; \ move a0,sp; \ j ret_from_sys_call; \ nop; \ END(handle_##exception) BUILD_HANDLER(adel,ade,ade,silent) /* #4 */ BUILD_HANDLER(ades,ade,ade,silent) /* #5 */ BUILD_HANDLER(ibe,ibe,cli,verbose) /* #6 */ BUILD_HANDLER(dbe,dbe,cli,silent) /* #7 */ BUILD_HANDLER(bp,bp,sti,silent) /* #9 */ BUILD_HANDLER(ri,ri,sti,silent) /* #10 */ BUILD_HANDLER(cpu,cpu,sti,silent) /* #11 */ BUILD_HANDLER(ov,ov,sti,silent) /* #12 */ BUILD_HANDLER(tr,tr,sti,silent) /* #13 */ BUILD_HANDLER(fpe,fpe,fpe,silent) /* #15 */ BUILD_HANDLER(watch,watch,sti,verbose) /* #23 */ BUILD_HANDLER(reserved,reserved,sti,verbose) /* others */ /* * Table of syscalls */ .data .align PTRLOG EXPORT(sys_call_table) #define SYS(call, narg) PTR call /* Reserved space for all SVR4 syscalls. */ .space (1000)*PTRSIZE #ifdef CONFIG_BINFMT_IRIX /* 32bit IRIX5 system calls. */ #include "irix5sys.h" #else .space (1000)*PTRSIZE /* No IRIX syscalls */ #endif /* Reserved space for all the BSD43 and POSIX syscalls. */ .space (2000)*PTRSIZE /* Linux flavoured syscalls. */ #include "syscalls.h" /* * Number of arguments of each syscall */ EXPORT(sys_narg_table) #undef SYS #define SYS(call, narg) .byte narg /* Reserved space for all SVR4 flavoured syscalls. */ .space (1000) #ifdef CONFIG_BINFMT_IRIX /* 32bit IRIX5 system calls. */ #include "irix5sys.h" #else .space (1000) /* No IRIX syscalls */ #endif /* Reserved space for all the BSD43 and POSIX syscalls. */ .space (2000) /* Linux flavoured syscalls. */ #include "syscalls.h" |