/* * Low-level exception handling code * * Copyright (C) 2012 ARM Ltd. * Authors: Catalin Marinas * Will Deacon * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #include #include #include /* * Context tracking subsystem. Used to instrument transitions * between user and kernel mode. */ .macro ct_user_exit, syscall = 0 #ifdef CONFIG_CONTEXT_TRACKING bl context_tracking_user_exit .if \syscall == 1 /* * Save/restore needed during syscalls. Restore syscall arguments from * the values already saved on stack during kernel_entry. */ ldp x0, x1, [sp] ldp x2, x3, [sp, #S_X2] ldp x4, x5, [sp, #S_X4] ldp x6, x7, [sp, #S_X6] .endif #endif .endm .macro ct_user_enter #ifdef CONFIG_CONTEXT_TRACKING bl context_tracking_user_enter #endif .endm /* * Bad Abort numbers *----------------- */ #define BAD_SYNC 0 #define BAD_IRQ 1 #define BAD_FIQ 2 #define BAD_ERROR 3 .macro kernel_entry, el, regsize = 64 sub sp, sp, #S_FRAME_SIZE .if \regsize == 32 mov w0, w0 // zero upper 32 bits of x0 .endif stp x0, x1, [sp, #16 * 0] stp x2, x3, [sp, #16 * 1] stp x4, x5, [sp, #16 * 2] stp x6, x7, [sp, #16 * 3] stp x8, x9, [sp, #16 * 4] stp x10, x11, [sp, #16 * 5] stp x12, x13, [sp, #16 * 6] stp x14, x15, [sp, #16 * 7] stp x16, x17, [sp, #16 * 8] stp x18, x19, [sp, #16 * 9] stp x20, x21, [sp, #16 * 10] stp x22, x23, [sp, #16 * 11] stp x24, x25, [sp, #16 * 12] stp x26, x27, [sp, #16 * 13] stp x28, x29, [sp, #16 * 14] .if \el == 0 mrs x21, sp_el0 get_thread_info tsk // Ensure MDSCR_EL1.SS is clear, ldr x19, [tsk, #TI_FLAGS] // since we can unmask debug disable_step_tsk x19, x20 // exceptions when scheduling. .else add x21, sp, #S_FRAME_SIZE .endif mrs x22, elr_el1 mrs x23, spsr_el1 stp lr, x21, [sp, #S_LR] stp x22, x23, [sp, #S_PC] /* * Set syscallno to -1 by default (overridden later if real syscall). */ .if \el == 0 mvn x21, xzr str x21, [sp, #S_SYSCALLNO] .endif /* * Registers that may be useful after this macro is invoked: * * x21 - aborted SP * x22 - aborted PC * x23 - aborted PSTATE */ .endm .macro kernel_exit, el, ret = 0 ldp x21, x22, [sp, #S_PC] // load ELR, SPSR .if \el == 0 ct_user_enter ldr x23, [sp, #S_SP] // load return stack pointer msr sp_el0, x23 .endif msr elr_el1, x21 // set up the return data msr spsr_el1, x22 .if \ret ldr x1, [sp, #S_X1] // preserve x0 (syscall return) .else ldp x0, x1, [sp, #16 * 0] .endif ldp x2, x3, [sp, #16 * 1] ldp x4, x5, [sp, #16 * 2] ldp x6, x7, [sp, #16 * 3] ldp x8, x9, [sp, #16 * 4] ldp x10, x11, [sp, #16 * 5] ldp x12, x13, [sp, #16 * 6] ldp x14, x15, [sp, #16 * 7] ldp x16, x17, [sp, #16 * 8] ldp x18, x19, [sp, #16 * 9] ldp x20, x21, [sp, #16 * 10] ldp x22, x23, [sp, #16 * 11] ldp x24, x25, [sp, #16 * 12] ldp x26, x27, [sp, #16 * 13] ldp x28, x29, [sp, #16 * 14] ldr lr, [sp, #S_LR] add sp, sp, #S_FRAME_SIZE // restore sp eret // return to kernel .endm .macro get_thread_info, rd mov \rd, sp and \rd, \rd, #~(THREAD_SIZE - 1) // top of stack .endm /* * These are the registers used in the syscall handler, and allow us to * have in theory up to 7 arguments to a function - x0 to x6. * * x7 is reserved for the system call number in 32-bit mode. */ sc_nr .req x25 // number of system calls scno .req x26 // syscall number stbl .req x27 // syscall table pointer tsk .req x28 // current thread_info /* * Interrupt handling. */ .macro irq_handler adrp x1, handle_arch_irq ldr x1, [x1, #:lo12:handle_arch_irq] mov x0, sp blr x1 .endm .text /* * Exception vectors. */ .align 11 ENTRY(vectors) ventry el1_sync_invalid // Synchronous EL1t ventry el1_irq_invalid // IRQ EL1t ventry el1_fiq_invalid // FIQ EL1t ventry el1_error_invalid // Error EL1t ventry el1_sync // Synchronous EL1h ventry el1_irq // IRQ EL1h ventry el1_fiq_invalid // FIQ EL1h ventry el1_error_invalid // Error EL1h ventry el0_sync // Synchronous 64-bit EL0 ventry el0_irq // IRQ 64-bit EL0 ventry el0_fiq_invalid // FIQ 64-bit EL0 ventry el0_error_invalid // Error 64-bit EL0 #ifdef CONFIG_COMPAT ventry el0_sync_compat // Synchronous 32-bit EL0 ventry el0_irq_compat // IRQ 32-bit EL0 ventry el0_fiq_invalid_compat // FIQ 32-bit EL0 ventry el0_error_invalid_compat // Error 32-bit EL0 #else ventry el0_sync_invalid // Synchronous 32-bit EL0 ventry el0_irq_invalid // IRQ 32-bit EL0 ventry el0_fiq_invalid // FIQ 32-bit EL0 ventry el0_error_invalid // Error 32-bit EL0 #endif END(vectors) /* * Invalid mode handlers */ .macro inv_entry, el, reason, regsize = 64 kernel_entry el, \regsize mov x0, sp mov x1, #\reason mrs x2, esr_el1 b bad_mode .endm el0_sync_invalid: inv_entry 0, BAD_SYNC ENDPROC(el0_sync_invalid) el0_irq_invalid: inv_entry 0, BAD_IRQ ENDPROC(el0_irq_invalid) el0_fiq_invalid: inv_entry 0, BAD_FIQ ENDPROC(el0_fiq_invalid) el0_error_invalid: inv_entry 0, BAD_ERROR ENDPROC(el0_error_invalid) #ifdef CONFIG_COMPAT el0_fiq_invalid_compat: inv_entry 0, BAD_FIQ, 32 ENDPROC(el0_fiq_invalid_compat) el0_error_invalid_compat: inv_entry 0, BAD_ERROR, 32 ENDPROC(el0_error_invalid_compat) #endif el1_sync_invalid: inv_entry 1, BAD_SYNC ENDPROC(el1_sync_invalid) el1_irq_invalid: inv_entry 1, BAD_IRQ ENDPROC(el1_irq_invalid) el1_fiq_invalid: inv_entry 1, BAD_FIQ ENDPROC(el1_fiq_invalid) el1_error_invalid: inv_entry 1, BAD_ERROR ENDPROC(el1_error_invalid) /* * EL1 mode handlers. */ .align 6 el1_sync: kernel_entry 1 mrs x1, esr_el1 // read the syndrome register lsr x24, x1, #ESR_ELx_EC_SHIFT // exception class cmp x24, #ESR_ELx_EC_DABT_CUR // data abort in EL1 b.eq el1_da cmp x24, #ESR_ELx_EC_SYS64 // configurable trap b.eq el1_undef cmp x24, #ESR_ELx_EC_SP_ALIGN // stack alignment exception b.eq el1_sp_pc cmp x24, #ESR_ELx_EC_PC_ALIGN // pc alignment exception b.eq el1_sp_pc cmp x24, #ESR_ELx_EC_UNKNOWN // unknown exception in EL1 b.eq el1_undef cmp x24, #ESR_ELx_EC_BREAKPT_CUR // debug exception in EL1 b.ge el1_dbg b el1_inv el1_da: /* * Data abort handling */ mrs x0, far_el1 enable_dbg // re-enable interrupts if they were enabled in the aborted context tbnz x23, #7, 1f // PSR_I_BIT enable_irq 1: mov x2, sp // struct pt_regs bl do_mem_abort // disable interrupts before pulling preserved data off the stack disable_irq kernel_exit 1 el1_sp_pc: /* * Stack or PC alignment exception handling */ mrs x0, far_el1 enable_dbg mov x2, sp b do_sp_pc_abort el1_undef: /* * Undefined instruction */ enable_dbg mov x0, sp b do_undefinstr el1_dbg: /* * Debug exception handling */ cmp x24, #ESR_ELx_EC_BRK64 // if BRK64 cinc x24, x24, eq // set bit '0' tbz x24, #0, el1_inv // EL1 only mrs x0, far_el1 mov x2, sp // struct pt_regs bl do_debug_exception kernel_exit 1 el1_inv: // TODO: add support for undefined instructions in kernel mode enable_dbg mov x0, sp mov x1, #BAD_SYNC mrs x2, esr_el1 b bad_mode ENDPROC(el1_sync) .align 6 el1_irq: kernel_entry 1 enable_dbg #ifdef CONFIG_TRACE_IRQFLAGS bl trace_hardirqs_off #endif irq_handler #ifdef CONFIG_PREEMPT get_thread_info tsk ldr w24, [tsk, #TI_PREEMPT] // get preempt count cbnz w24, 1f // preempt count != 0 ldr x0, [tsk, #TI_FLAGS] // get flags tbz x0, #TIF_NEED_RESCHED, 1f // needs rescheduling? bl el1_preempt 1: #endif #ifdef CONFIG_TRACE_IRQFLAGS bl trace_hardirqs_on #endif kernel_exit 1 ENDPROC(el1_irq) #ifdef CONFIG_PREEMPT el1_preempt: mov x24, lr 1: bl preempt_schedule_irq // irq en/disable is done inside ldr x0, [tsk, #TI_FLAGS] // get new tasks TI_FLAGS tbnz x0, #TIF_NEED_RESCHED, 1b // needs rescheduling? ret x24 #endif /* * EL0 mode handlers. */ .align 6 el0_sync: kernel_entry 0 mrs x25, esr_el1 // read the syndrome register lsr x24, x25, #ESR_ELx_EC_SHIFT // exception class cmp x24, #ESR_ELx_EC_SVC64 // SVC in 64-bit state b.eq el0_svc cmp x24, #ESR_ELx_EC_DABT_LOW // data abort in EL0 b.eq el0_da cmp x24, #ESR_ELx_EC_IABT_LOW // instruction abort in EL0 b.eq el0_ia cmp x24, #ESR_ELx_EC_FP_ASIMD // FP/ASIMD access b.eq el0_fpsimd_acc cmp x24, #ESR_ELx_EC_FP_EXC64 // FP/ASIMD exception b.eq el0_fpsimd_exc cmp x24, #ESR_ELx_EC_SYS64 // configurable trap b.eq el0_undef cmp x24, #ESR_ELx_EC_SP_ALIGN // stack alignment exception b.eq el0_sp_pc cmp x24, #ESR_ELx_EC_PC_ALIGN // pc alignment exception b.eq el0_sp_pc cmp x24, #ESR_ELx_EC_UNKNOWN // unknown exception in EL0 b.eq el0_undef cmp x24, #ESR_ELx_EC_BREAKPT_LOW // debug exception in EL0 b.ge el0_dbg b el0_inv #ifdef CONFIG_COMPAT .align 6 el0_sync_compat: kernel_entry 0, 32 mrs x25, esr_el1 // read the syndrome register lsr x24, x25, #ESR_ELx_EC_SHIFT // exception class cmp x24, #ESR_ELx_EC_SVC32 // SVC in 32-bit state b.eq el0_svc_compat cmp x24, #ESR_ELx_EC_DABT_LOW // data abort in EL0 b.eq el0_da cmp x24, #ESR_ELx_EC_IABT_LOW // instruction abort in EL0 b.eq el0_ia cmp x24, #ESR_ELx_EC_FP_ASIMD // FP/ASIMD access b.eq el0_fpsimd_acc cmp x24, #ESR_ELx_EC_FP_EXC32 // FP/ASIMD exception b.eq el0_fpsimd_exc cmp x24, #ESR_ELx_EC_UNKNOWN // unknown exception in EL0 b.eq el0_undef cmp x24, #ESR_ELx_EC_CP15_32 // CP15 MRC/MCR trap b.eq el0_undef cmp x24, #ESR_ELx_EC_CP15_64 // CP15 MRRC/MCRR trap b.eq el0_undef cmp x24, #ESR_ELx_EC_CP14_MR // CP14 MRC/MCR trap b.eq el0_undef cmp x24, #ESR_ELx_EC_CP14_LS // CP14 LDC/STC trap b.eq el0_undef cmp x24, #ESR_ELx_EC_CP14_64 // CP14 MRRC/MCRR trap b.eq el0_undef cmp x24, #ESR_ELx_EC_BREAKPT_LOW // debug exception in EL0 b.ge el0_dbg b el0_inv el0_svc_compat: /* * AArch32 syscall handling */ adrp stbl, compat_sys_call_table // load compat syscall table pointer uxtw scno, w7 // syscall number in w7 (r7) mov sc_nr, #__NR_compat_syscalls b el0_svc_naked .align 6 el0_irq_compat: kernel_entry 0, 32 b el0_irq_naked #endif el0_da: /* * Data abort handling */ mrs x26, far_el1 // enable interrupts before calling the main handler enable_dbg_and_irq ct_user_exit bic x0, x26, #(0xff << 56) mov x1, x25 mov x2, sp bl do_mem_abort b ret_to_user el0_ia: /* * Instruction abort handling */ mrs x26, far_el1 // enable interrupts before calling the main handler enable_dbg_and_irq ct_user_exit mov x0, x26 orr x1, x25, #1 << 24 // use reserved ISS bit for instruction aborts mov x2, sp bl do_mem_abort b ret_to_user el0_fpsimd_acc: /* * Floating Point or Advanced SIMD access */ enable_dbg ct_user_exit mov x0, x25 mov x1, sp bl do_fpsimd_acc b ret_to_user el0_fpsimd_exc: /* * Floating Point or Advanced SIMD exception */ enable_dbg ct_user_exit mov x0, x25 mov x1, sp bl do_fpsimd_exc b ret_to_user el0_sp_pc: /* * Stack or PC alignment exception handling */ mrs x26, far_el1 // enable interrupts before calling the main handler enable_dbg_and_irq mov x0, x26 mov x1, x25 mov x2, sp bl do_sp_pc_abort b ret_to_user el0_undef: /* * Undefined instruction */ // enable interrupts before calling the main handler enable_dbg_and_irq ct_user_exit mov x0, sp bl do_undefinstr b ret_to_user el0_dbg: /* * Debug exception handling */ tbnz x24, #0, el0_inv // EL0 only mrs x0, far_el1 mov x1, x25 mov x2, sp bl do_debug_exception enable_dbg ct_user_exit b ret_to_user el0_inv: enable_dbg ct_user_exit mov x0, sp mov x1, #BAD_SYNC mrs x2, esr_el1 bl bad_mode b ret_to_user ENDPROC(el0_sync) .align 6 el0_irq: kernel_entry 0 el0_irq_naked: enable_dbg #ifdef CONFIG_TRACE_IRQFLAGS bl trace_hardirqs_off #endif ct_user_exit irq_handler #ifdef CONFIG_TRACE_IRQFLAGS bl trace_hardirqs_on #endif b ret_to_user ENDPROC(el0_irq) /* * Register switch for AArch64. The callee-saved registers need to be saved * and restored. On entry: * x0 = previous task_struct (must be preserved across the switch) * x1 = next task_struct * Previous and next are guaranteed not to be the same. * */ ENTRY(cpu_switch_to) add x8, x0, #THREAD_CPU_CONTEXT mov x9, sp stp x19, x20, [x8], #16 // store callee-saved registers stp x21, x22, [x8], #16 stp x23, x24, [x8], #16 stp x25, x26, [x8], #16 stp x27, x28, [x8], #16 stp x29, x9, [x8], #16 str lr, [x8] add x8, x1, #THREAD_CPU_CONTEXT ldp x19, x20, [x8], #16 // restore callee-saved registers ldp x21, x22, [x8], #16 ldp x23, x24, [x8], #16 ldp x25, x26, [x8], #16 ldp x27, x28, [x8], #16 ldp x29, x9, [x8], #16 ldr lr, [x8] mov sp, x9 ret ENDPROC(cpu_switch_to) /* * This is the fast syscall return path. We do as little as possible here, * and this includes saving x0 back into the kernel stack. */ ret_fast_syscall: disable_irq // disable interrupts ldr x1, [tsk, #TI_FLAGS] and x2, x1, #_TIF_WORK_MASK cbnz x2, fast_work_pending enable_step_tsk x1, x2 kernel_exit 0, ret = 1 /* * Ok, we need to do extra processing, enter the slow path. */ fast_work_pending: str x0, [sp, #S_X0] // returned x0 work_pending: tbnz x1, #TIF_NEED_RESCHED, work_resched /* TIF_SIGPENDING, TIF_NOTIFY_RESUME or TIF_FOREIGN_FPSTATE case */ ldr x2, [sp, #S_PSTATE] mov x0, sp // 'regs' tst x2, #PSR_MODE_MASK // user mode regs? b.ne no_work_pending // returning to kernel enable_irq // enable interrupts for do_notify_resume() bl do_notify_resume b ret_to_user work_resched: bl schedule /* * "slow" syscall return path. */ ret_to_user: disable_irq // disable interrupts ldr x1, [tsk, #TI_FLAGS] and x2, x1, #_TIF_WORK_MASK cbnz x2, work_pending enable_step_tsk x1, x2 no_work_pending: kernel_exit 0, ret = 0 ENDPROC(ret_to_user) /* * This is how we return from a fork. */ ENTRY(ret_from_fork) bl schedule_tail cbz x19, 1f // not a kernel thread mov x0, x20 blr x19 1: get_thread_info tsk b ret_to_user ENDPROC(ret_from_fork) /* * SVC handler. */ .align 6 el0_svc: adrp stbl, sys_call_table // load syscall table pointer uxtw scno, w8 // syscall number in w8 mov sc_nr, #__NR_syscalls el0_svc_naked: // compat entry point stp x0, scno, [sp, #S_ORIG_X0] // save the original x0 and syscall number enable_dbg_and_irq ct_user_exit 1 ldr x16, [tsk, #TI_FLAGS] // check for syscall hooks tst x16, #_TIF_SYSCALL_WORK b.ne __sys_trace cmp scno, sc_nr // check upper syscall limit b.hs ni_sys ldr x16, [stbl, scno, lsl #3] // address in the syscall table blr x16 // call sys_* routine b ret_fast_syscall ni_sys: mov x0, sp bl do_ni_syscall b ret_fast_syscall ENDPROC(el0_svc) /* * This is the really slow path. We're going to be doing context * switches, and waiting for our parent to respond. */ __sys_trace: mov w0, #-1 // set default errno for cmp scno, x0 // user-issued syscall(-1) b.ne 1f mov x0, #-ENOSYS str x0, [sp, #S_X0] 1: mov x0, sp bl syscall_trace_enter cmp w0, #-1 // skip the syscall? b.eq __sys_trace_return_skipped uxtw scno, w0 // syscall number (possibly new) mov x1, sp // pointer to regs cmp scno, sc_nr // check upper syscall limit b.hs __ni_sys_trace ldp x0, x1, [sp] // restore the syscall args ldp x2, x3, [sp, #S_X2] ldp x4, x5, [sp, #S_X4] ldp x6, x7, [sp, #S_X6] ldr x16, [stbl, scno, lsl #3] // address in the syscall table blr x16 // call sys_* routine __sys_trace_return: str x0, [sp, #S_X0] // save returned x0 __sys_trace_return_skipped: mov x0, sp bl syscall_trace_exit b ret_to_user __ni_sys_trace: mov x0, sp bl do_ni_syscall b __sys_trace_return /* * Special system call wrappers. */ ENTRY(sys_rt_sigreturn_wrapper) mov x0, sp b sys_rt_sigreturn ENDPROC(sys_rt_sigreturn_wrapper)