projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2923f5ea GH |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // Copyright (C) 2005-2017 Andes Technology Corporation | |
| 3 | ||
| 4 | #include <linux/linkage.h> | |
| 5 | #include <asm/unistd.h> | |
| 6 | #include <asm/assembler.h> | |
| 7 | #include <asm/nds32.h> | |
| 8 | #include <asm/asm-offsets.h> | |
| 9 | #include <asm/thread_info.h> | |
| 10 | #include <asm/current.h> | |
| 11 | ||
| 12 | ||
| 13 | ||
| 14 | #ifdef CONFIG_HWZOL | |
| 15 | .macro pop_zol | |
| 16 | mtusr $r14, $LB | |
| 17 | mtusr $r15, $LE | |
| 18 | mtusr $r16, $LC | |
| 19 | .endm | |
| 20 | #endif | |
| 21 | ||
| 22 | .macro restore_user_regs_first | |
| 23 | setgie.d | |
| 24 | isb | |
| 25 | ||
| 26 | addi $sp, $sp, FUCOP_CTL_OFFSET | |
| 27 | ||
| 28 | lmw.adm $r12, [$sp], $r24, #0x0 | |
| 29 | mtsr $r12, $SP_USR | |
| 30 | mtsr $r13, $IPC | |
| 31 | #ifdef CONFIG_HWZOL | |
| 32 | pop_zol | |
| 33 | #endif | |
| 34 | mtsr $r19, $PSW | |
| 35 | mtsr $r20, $IPSW | |
| 36 | mtsr $r21, $P_IPSW | |
| 37 | mtsr $r22, $P_IPC | |
| 38 | mtsr $r23, $P_P0 | |
| 39 | mtsr $r24, $P_P1 | |
| 40 | lmw.adm $sp, [$sp], $sp, #0xe | |
| 41 | .endm | |
| 42 | ||
| 43 | .macro restore_user_regs_last | |
| 44 | pop $p0 | |
| 45 | cmovn $sp, $p0, $p0 | |
| 46 | ||
| 47 | iret | |
| 48 | nop | |
| 49 | ||
| 50 | .endm | |
| 51 | ||
| 52 | .macro restore_user_regs | |
| 53 | restore_user_regs_first | |
| 54 | lmw.adm $r0, [$sp], $r25, #0x0 | |
| 55 | addi $sp, $sp, OSP_OFFSET | |
| 56 | restore_user_regs_last | |
| 57 | .endm | |
| 58 | ||
| 59 | .macro fast_restore_user_regs | |
| 60 | restore_user_regs_first | |
| 61 | lmw.adm $r1, [$sp], $r25, #0x0 | |
| 62 | addi $sp, $sp, OSP_OFFSET-4 | |
| 63 | restore_user_regs_last | |
| 64 | .endm | |
| 65 | ||
| 66 | #ifdef CONFIG_PREEMPT | |
| 67 | .macro preempt_stop | |
| 68 | .endm | |
| 69 | #else | |
| 70 | .macro preempt_stop | |
| 71 | setgie.d | |
| 72 | isb | |
| 73 | .endm | |
| 74 | #define resume_kernel no_work_pending | |
| 75 | #endif | |
| 76 | ||
| 77 | ENTRY(ret_from_exception) | |
| 78 | preempt_stop | |
| 79 | ENTRY(ret_from_intr) | |
| 80 | ||
| 81 | /* | |
| 82 | * judge Kernel or user mode | |
| 83 | * | |
| 84 | */ | |
| 85 | lwi $p0, [$sp+(#IPSW_OFFSET)] ! Check if in nested interrupt | |
| 86 | andi $p0, $p0, #PSW_mskINTL | |
| 87 | bnez $p0, resume_kernel ! done with iret | |
| 88 | j resume_userspace | |
| 89 | ||
| 90 | ||
| 91 | /* | |
| 92 | * This is the fast syscall return path. We do as little as | |
| 93 | * possible here, and this includes saving $r0 back into the SVC | |
| 94 | * stack. | |
| 95 | * fixed: tsk - $r25, syscall # - $r7, syscall table pointer - $r8 | |
| 96 | */ | |
| 97 | ENTRY(ret_fast_syscall) | |
| 98 | gie_disable | |
| 99 | lwi $r1, [tsk+#TSK_TI_FLAGS] | |
| 100 | andi $p1, $r1, #_TIF_WORK_MASK | |
| 101 | bnez $p1, fast_work_pending | |
| 102 | fast_restore_user_regs ! iret | |
| 103 | ||
| 104 | /* | |
| 105 | * Ok, we need to do extra processing, | |
| 106 | * enter the slow path returning from syscall, while pending work. | |
| 107 | */ | |
| 108 | fast_work_pending: | |
| 109 | swi $r0, [$sp+(#R0_OFFSET)] ! what is different from ret_from_exception | |
| 110 | work_pending: | |
| 111 | andi $p1, $r1, #_TIF_NEED_RESCHED | |
| 112 | bnez $p1, work_resched | |
| 113 | ||
| 114 | andi $p1, $r1, #_TIF_SIGPENDING|#_TIF_NOTIFY_RESUME | |
| 115 | beqz $p1, no_work_pending | |
| 116 | ||
| 117 | move $r0, $sp ! 'regs' | |
| 118 | gie_enable | |
| 119 | bal do_notify_resume | |
| 120 | b ret_slow_syscall | |
| 121 | work_resched: | |
| 122 | bal schedule ! path, return to user mode | |
| 123 | ||
| 124 | /* | |
| 125 | * "slow" syscall return path. | |
| 126 | */ | |
| 127 | ENTRY(resume_userspace) | |
| 128 | ENTRY(ret_slow_syscall) | |
| 129 | gie_disable | |
| 130 | lwi $p0, [$sp+(#IPSW_OFFSET)] ! Check if in nested interrupt | |
| 131 | andi $p0, $p0, #PSW_mskINTL | |
| 132 | bnez $p0, no_work_pending ! done with iret | |
| 133 | lwi $r1, [tsk+#TSK_TI_FLAGS] | |
| 134 | andi $p1, $r1, #_TIF_WORK_MASK | |
| 135 | bnez $p1, work_pending ! handle work_resched, sig_pend | |
| 136 | ||
| 137 | no_work_pending: | |
| 138 | #ifdef CONFIG_TRACE_IRQFLAGS | |
| 139 | lwi $p0, [$sp+(#IPSW_OFFSET)] | |
| 140 | andi $p0, $p0, #0x1 | |
| 0cde56e0 GH |
141 | la $r10, __trace_hardirqs_off |
| 142 | la $r9, __trace_hardirqs_on | |
| 2923f5ea GH |
143 | cmovz $r9, $p0, $r10 |
| 144 | jral $r9 | |
| 145 | #endif | |
| 146 | restore_user_regs ! return from iret | |
| 147 | ||
| 148 | ||
| 149 | /* | |
| 150 | * preemptive kernel | |
| 151 | */ | |
| 152 | #ifdef CONFIG_PREEMPT | |
| 153 | resume_kernel: | |
| 154 | gie_disable | |
| 155 | lwi $t0, [tsk+#TSK_TI_PREEMPT] | |
| 156 | bnez $t0, no_work_pending | |
| 157 | need_resched: | |
| 158 | lwi $t0, [tsk+#TSK_TI_FLAGS] | |
| 159 | andi $p1, $t0, #_TIF_NEED_RESCHED | |
| 160 | beqz $p1, no_work_pending | |
| 161 | ||
| 162 | lwi $t0, [$sp+(#IPSW_OFFSET)] ! Interrupts off? | |
| 163 | andi $t0, $t0, #1 | |
| 164 | beqz $t0, no_work_pending | |
| 165 | ||
| 166 | jal preempt_schedule_irq | |
| 167 | b need_resched | |
| 168 | #endif | |
| 169 | ||
| 170 | /* | |
| 171 | * This is how we return from a fork. | |
| 172 | */ | |
| 173 | ENTRY(ret_from_fork) | |
| 174 | bal schedule_tail | |
| 175 | beqz $r6, 1f ! r6 stores fn for kernel thread | |
| 176 | move $r0, $r7 ! prepare kernel thread arg | |
| 177 | jral $r6 | |
| 178 | 1: | |
| 179 | lwi $r1, [tsk+#TSK_TI_FLAGS] ! check for syscall tracing | |
| 180 | andi $p1, $r1, #_TIF_WORK_SYSCALL_LEAVE ! are we tracing syscalls? | |
| 181 | beqz $p1, ret_slow_syscall | |
| 182 | move $r0, $sp | |
| 183 | bal syscall_trace_leave | |
| 184 | b ret_slow_syscall |