| /* |
| * linux/arch/arm/kernel/entry-common.S |
| * |
| * Copyright (C) 2000 Russell King |
| * |
| * 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. |
| */ |
| |
| #include <asm/unistd.h> |
| #include <asm/ftrace.h> |
| #include <mach/entry-macro.S> |
| |
| #include "entry-header.S" |
| |
| |
| .align 5 |
| /* |
| * This is the fast syscall return path. We do as little as |
| * possible here, and this includes saving r0 back into the SVC |
| * stack. |
| */ |
| ret_fast_syscall: |
| disable_irq @ disable interrupts |
| ldr r1, [tsk, #TI_FLAGS] |
| tst r1, #_TIF_WORK_MASK |
| bne fast_work_pending |
| |
| /* perform architecture specific actions before user return */ |
| arch_ret_to_user r1, lr |
| |
| @ fast_restore_user_regs |
| ldr r1, [sp, #S_OFF + S_PSR] @ get calling cpsr |
| ldr lr, [sp, #S_OFF + S_PC]! @ get pc |
| msr spsr_cxsf, r1 @ save in spsr_svc |
| ldmdb sp, {r1 - lr}^ @ get calling r1 - lr |
| mov r0, r0 |
| add sp, sp, #S_FRAME_SIZE - S_PC |
| movs pc, lr @ return & move spsr_svc into cpsr |
| |
| /* |
| * Ok, we need to do extra processing, enter the slow path. |
| */ |
| fast_work_pending: |
| str r0, [sp, #S_R0+S_OFF]! @ returned r0 |
| work_pending: |
| tst r1, #_TIF_NEED_RESCHED |
| bne work_resched |
| tst r1, #_TIF_SIGPENDING |
| beq no_work_pending |
| mov r0, sp @ 'regs' |
| mov r2, why @ 'syscall' |
| bl do_notify_resume |
| b ret_slow_syscall @ Check work again |
| |
| work_resched: |
| bl schedule |
| /* |
| * "slow" syscall return path. "why" tells us if this was a real syscall. |
| */ |
| ENTRY(ret_to_user) |
| ret_slow_syscall: |
| disable_irq @ disable interrupts |
| ldr r1, [tsk, #TI_FLAGS] |
| tst r1, #_TIF_WORK_MASK |
| bne work_pending |
| no_work_pending: |
| /* perform architecture specific actions before user return */ |
| arch_ret_to_user r1, lr |
| |
| @ slow_restore_user_regs |
| ldr r1, [sp, #S_PSR] @ get calling cpsr |
| ldr lr, [sp, #S_PC]! @ get pc |
| msr spsr_cxsf, r1 @ save in spsr_svc |
| ldmdb sp, {r0 - lr}^ @ get calling r0 - lr |
| mov r0, r0 |
| add sp, sp, #S_FRAME_SIZE - S_PC |
| movs pc, lr @ return & move spsr_svc into cpsr |
| ENDPROC(ret_to_user) |
| |
| /* |
| * This is how we return from a fork. |
| */ |
| ENTRY(ret_from_fork) |
| bl schedule_tail |
| get_thread_info tsk |
| ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing |
| mov why, #1 |
| tst r1, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? |
| beq ret_slow_syscall |
| mov r1, sp |
| mov r0, #1 @ trace exit [IP = 1] |
| bl syscall_trace |
| b ret_slow_syscall |
| ENDPROC(ret_from_fork) |
| |
| .equ NR_syscalls,0 |
| #define CALL(x) .equ NR_syscalls,NR_syscalls+1 |
| #include "calls.S" |
| #undef CALL |
| #define CALL(x) .long x |
| |
| #ifdef CONFIG_FUNCTION_TRACER |
| #ifdef CONFIG_DYNAMIC_FTRACE |
| ENTRY(mcount) |
| stmdb sp!, {r0-r3, lr} |
| mov r0, lr |
| sub r0, r0, #MCOUNT_INSN_SIZE |
| |
| .globl mcount_call |
| mcount_call: |
| bl ftrace_stub |
| ldr lr, [fp, #-4] @ restore lr |
| ldmia sp!, {r0-r3, pc} |
| |
| ENTRY(ftrace_caller) |
| stmdb sp!, {r0-r3, lr} |
| ldr r1, [fp, #-4] |
| mov r0, lr |
| sub r0, r0, #MCOUNT_INSN_SIZE |
| |
| .globl ftrace_call |
| ftrace_call: |
| bl ftrace_stub |
| ldr lr, [fp, #-4] @ restore lr |
| ldmia sp!, {r0-r3, pc} |
| |
| #else |
| |
| ENTRY(mcount) |
| stmdb sp!, {r0-r3, lr} |
| ldr r0, =ftrace_trace_function |
| ldr r2, [r0] |
| adr r0, ftrace_stub |
| cmp r0, r2 |
| bne trace |
| ldr lr, [fp, #-4] @ restore lr |
| ldmia sp!, {r0-r3, pc} |
| |
| trace: |
| ldr r1, [fp, #-4] @ lr of instrumented routine |
| mov r0, lr |
| sub r0, r0, #MCOUNT_INSN_SIZE |
| mov lr, pc |
| mov pc, r2 |
| mov lr, r1 @ restore lr |
| ldmia sp!, {r0-r3, pc} |
| |
| #endif /* CONFIG_DYNAMIC_FTRACE */ |
| |
| .globl ftrace_stub |
| ftrace_stub: |
| mov pc, lr |
| |
| #endif /* CONFIG_FUNCTION_TRACER */ |
| |
| /*============================================================================= |
| * SWI handler |
| *----------------------------------------------------------------------------- |
| */ |
| |
| /* If we're optimising for StrongARM the resulting code won't |
| run on an ARM7 and we can save a couple of instructions. |
| --pb */ |
| #ifdef CONFIG_CPU_ARM710 |
| #define A710(code...) code |
| .Larm710bug: |
| ldmia sp, {r0 - lr}^ @ Get calling r0 - lr |
| mov r0, r0 |
| add sp, sp, #S_FRAME_SIZE |
| subs pc, lr, #4 |
| #else |
| #define A710(code...) |
| #endif |
| |
| .align 5 |
| ENTRY(vector_swi) |
| sub sp, sp, #S_FRAME_SIZE |
| stmia sp, {r0 - r12} @ Calling r0 - r12 |
| add r8, sp, #S_PC |
| stmdb r8, {sp, lr}^ @ Calling sp, lr |
| mrs r8, spsr @ called from non-FIQ mode, so ok. |
| str lr, [sp, #S_PC] @ Save calling PC |
| str r8, [sp, #S_PSR] @ Save CPSR |
| str r0, [sp, #S_OLD_R0] @ Save OLD_R0 |
| zero_fp |
| |
| /* |
| * Get the system call number. |
| */ |
| |
| #if defined(CONFIG_OABI_COMPAT) |
| |
| /* |
| * If we have CONFIG_OABI_COMPAT then we need to look at the swi |
| * value to determine if it is an EABI or an old ABI call. |
| */ |
| #ifdef CONFIG_ARM_THUMB |
| tst r8, #PSR_T_BIT |
| movne r10, #0 @ no thumb OABI emulation |
| ldreq r10, [lr, #-4] @ get SWI instruction |
| #else |
| ldr r10, [lr, #-4] @ get SWI instruction |
| A710( and ip, r10, #0x0f000000 @ check for SWI ) |
| A710( teq ip, #0x0f000000 ) |
| A710( bne .Larm710bug ) |
| #endif |
| |
| #elif defined(CONFIG_AEABI) |
| |
| /* |
| * Pure EABI user space always put syscall number into scno (r7). |
| */ |
| A710( ldr ip, [lr, #-4] @ get SWI instruction ) |
| A710( and ip, ip, #0x0f000000 @ check for SWI ) |
| A710( teq ip, #0x0f000000 ) |
| A710( bne .Larm710bug ) |
| |
| #elif defined(CONFIG_ARM_THUMB) |
| |
| /* Legacy ABI only, possibly thumb mode. */ |
| tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs |
| addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in |
| ldreq scno, [lr, #-4] |
| |
| #else |
| |
| /* Legacy ABI only. */ |
| ldr scno, [lr, #-4] @ get SWI instruction |
| A710( and ip, scno, #0x0f000000 @ check for SWI ) |
| A710( teq ip, #0x0f000000 ) |
| A710( bne .Larm710bug ) |
| |
| #endif |
| |
| #ifdef CONFIG_ALIGNMENT_TRAP |
| ldr ip, __cr_alignment |
| ldr ip, [ip] |
| mcr p15, 0, ip, c1, c0 @ update control register |
| #endif |
| enable_irq |
| |
| get_thread_info tsk |
| adr tbl, sys_call_table @ load syscall table pointer |
| ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing |
| |
| #if defined(CONFIG_OABI_COMPAT) |
| /* |
| * If the swi argument is zero, this is an EABI call and we do nothing. |
| * |
| * If this is an old ABI call, get the syscall number into scno and |
| * get the old ABI syscall table address. |
| */ |
| bics r10, r10, #0xff000000 |
| eorne scno, r10, #__NR_OABI_SYSCALL_BASE |
| ldrne tbl, =sys_oabi_call_table |
| #elif !defined(CONFIG_AEABI) |
| bic scno, scno, #0xff000000 @ mask off SWI op-code |
| eor scno, scno, #__NR_SYSCALL_BASE @ check OS number |
| #endif |
| |
| stmdb sp!, {r4, r5} @ push fifth and sixth args |
| tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls? |
| bne __sys_trace |
| |
| cmp scno, #NR_syscalls @ check upper syscall limit |
| adr lr, ret_fast_syscall @ return address |
| ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine |
| |
| add r1, sp, #S_OFF |
| 2: mov why, #0 @ no longer a real syscall |
| cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) |
| eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back |
| bcs arm_syscall |
| b sys_ni_syscall @ not private func |
| ENDPROC(vector_swi) |
| |
| /* |
| * This is the really slow path. We're going to be doing |
| * context switches, and waiting for our parent to respond. |
| */ |
| __sys_trace: |
| mov r2, scno |
| add r1, sp, #S_OFF |
| mov r0, #0 @ trace entry [IP = 0] |
| bl syscall_trace |
| |
| adr lr, __sys_trace_return @ return address |
| mov scno, r0 @ syscall number (possibly new) |
| add r1, sp, #S_R0 + S_OFF @ pointer to regs |
| cmp scno, #NR_syscalls @ check upper syscall limit |
| ldmccia r1, {r0 - r3} @ have to reload r0 - r3 |
| ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine |
| b 2b |
| |
| __sys_trace_return: |
| str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 |
| mov r2, scno |
| mov r1, sp |
| mov r0, #1 @ trace exit [IP = 1] |
| bl syscall_trace |
| b ret_slow_syscall |
| |
| .align 5 |
| #ifdef CONFIG_ALIGNMENT_TRAP |
| .type __cr_alignment, #object |
| __cr_alignment: |
| .word cr_alignment |
| #endif |
| .ltorg |
| |
| /* |
| * This is the syscall table declaration for native ABI syscalls. |
| * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall. |
| */ |
| #define ABI(native, compat) native |
| #ifdef CONFIG_AEABI |
| #define OBSOLETE(syscall) sys_ni_syscall |
| #else |
| #define OBSOLETE(syscall) syscall |
| #endif |
| |
| .type sys_call_table, #object |
| ENTRY(sys_call_table) |
| #include "calls.S" |
| #undef ABI |
| #undef OBSOLETE |
| |
| /*============================================================================ |
| * Special system call wrappers |
| */ |
| @ r0 = syscall number |
| @ r8 = syscall table |
| sys_syscall: |
| bic scno, r0, #__NR_OABI_SYSCALL_BASE |
| cmp scno, #__NR_syscall - __NR_SYSCALL_BASE |
| cmpne scno, #NR_syscalls @ check range |
| stmloia sp, {r5, r6} @ shuffle args |
| movlo r0, r1 |
| movlo r1, r2 |
| movlo r2, r3 |
| movlo r3, r4 |
| ldrlo pc, [tbl, scno, lsl #2] |
| b sys_ni_syscall |
| ENDPROC(sys_syscall) |
| |
| sys_fork_wrapper: |
| add r0, sp, #S_OFF |
| b sys_fork |
| ENDPROC(sys_fork_wrapper) |
| |
| sys_vfork_wrapper: |
| add r0, sp, #S_OFF |
| b sys_vfork |
| ENDPROC(sys_vfork_wrapper) |
| |
| sys_execve_wrapper: |
| add r3, sp, #S_OFF |
| b sys_execve |
| ENDPROC(sys_execve_wrapper) |
| |
| sys_clone_wrapper: |
| add ip, sp, #S_OFF |
| str ip, [sp, #4] |
| b sys_clone |
| ENDPROC(sys_clone_wrapper) |
| |
| sys_sigsuspend_wrapper: |
| add r3, sp, #S_OFF |
| b sys_sigsuspend |
| ENDPROC(sys_sigsuspend_wrapper) |
| |
| sys_rt_sigsuspend_wrapper: |
| add r2, sp, #S_OFF |
| b sys_rt_sigsuspend |
| ENDPROC(sys_rt_sigsuspend_wrapper) |
| |
| sys_sigreturn_wrapper: |
| add r0, sp, #S_OFF |
| b sys_sigreturn |
| ENDPROC(sys_sigreturn_wrapper) |
| |
| sys_rt_sigreturn_wrapper: |
| add r0, sp, #S_OFF |
| b sys_rt_sigreturn |
| ENDPROC(sys_rt_sigreturn_wrapper) |
| |
| sys_sigaltstack_wrapper: |
| ldr r2, [sp, #S_OFF + S_SP] |
| b do_sigaltstack |
| ENDPROC(sys_sigaltstack_wrapper) |
| |
| sys_statfs64_wrapper: |
| teq r1, #88 |
| moveq r1, #84 |
| b sys_statfs64 |
| ENDPROC(sys_statfs64_wrapper) |
| |
| sys_fstatfs64_wrapper: |
| teq r1, #88 |
| moveq r1, #84 |
| b sys_fstatfs64 |
| ENDPROC(sys_fstatfs64_wrapper) |
| |
| /* |
| * Note: off_4k (r5) is always units of 4K. If we can't do the requested |
| * offset, we return EINVAL. |
| */ |
| sys_mmap2: |
| #if PAGE_SHIFT > 12 |
| tst r5, #PGOFF_MASK |
| moveq r5, r5, lsr #PAGE_SHIFT - 12 |
| streq r5, [sp, #4] |
| beq do_mmap2 |
| mov r0, #-EINVAL |
| mov pc, lr |
| #else |
| str r5, [sp, #4] |
| b do_mmap2 |
| #endif |
| ENDPROC(sys_mmap2) |
| |
| ENTRY(pabort_ifar) |
| mrc p15, 0, r0, cr6, cr0, 2 |
| ENTRY(pabort_noifar) |
| mov pc, lr |
| ENDPROC(pabort_ifar) |
| ENDPROC(pabort_noifar) |
| |
| #ifdef CONFIG_OABI_COMPAT |
| |
| /* |
| * These are syscalls with argument register differences |
| */ |
| |
| sys_oabi_pread64: |
| stmia sp, {r3, r4} |
| b sys_pread64 |
| ENDPROC(sys_oabi_pread64) |
| |
| sys_oabi_pwrite64: |
| stmia sp, {r3, r4} |
| b sys_pwrite64 |
| ENDPROC(sys_oabi_pwrite64) |
| |
| sys_oabi_truncate64: |
| mov r3, r2 |
| mov r2, r1 |
| b sys_truncate64 |
| ENDPROC(sys_oabi_truncate64) |
| |
| sys_oabi_ftruncate64: |
| mov r3, r2 |
| mov r2, r1 |
| b sys_ftruncate64 |
| ENDPROC(sys_oabi_ftruncate64) |
| |
| sys_oabi_readahead: |
| str r3, [sp] |
| mov r3, r2 |
| mov r2, r1 |
| b sys_readahead |
| ENDPROC(sys_oabi_readahead) |
| |
| /* |
| * Let's declare a second syscall table for old ABI binaries |
| * using the compatibility syscall entries. |
| */ |
| #define ABI(native, compat) compat |
| #define OBSOLETE(syscall) syscall |
| |
| .type sys_oabi_call_table, #object |
| ENTRY(sys_oabi_call_table) |
| #include "calls.S" |
| #undef ABI |
| #undef OBSOLETE |
| |
| #endif |
| |