forked from luck/tmp_suning_uos_patched
e94c805f0c
Conflicts: arch/arm/kernel/ptrace.c
633 lines
14 KiB
ArmAsm
633 lines
14 KiB
ArmAsm
/*
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* linux/arch/arm/kernel/entry-common.S
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*
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* Copyright (C) 2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/unistd.h>
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#include <asm/ftrace.h>
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#include <asm/unwind.h>
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#ifdef CONFIG_NEED_RET_TO_USER
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#include <mach/entry-macro.S>
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#else
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.macro arch_ret_to_user, tmp1, tmp2
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.endm
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#endif
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#include "entry-header.S"
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.align 5
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/*
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* This is the fast syscall return path. We do as little as
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* possible here, and this includes saving r0 back into the SVC
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* stack.
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*/
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ret_fast_syscall:
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UNWIND(.fnstart )
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UNWIND(.cantunwind )
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disable_irq @ disable interrupts
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ldr r1, [tsk, #TI_FLAGS]
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tst r1, #_TIF_WORK_MASK
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bne fast_work_pending
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#if defined(CONFIG_IRQSOFF_TRACER)
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asm_trace_hardirqs_on
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#endif
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/* perform architecture specific actions before user return */
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arch_ret_to_user r1, lr
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restore_user_regs fast = 1, offset = S_OFF
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UNWIND(.fnend )
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/*
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* Ok, we need to do extra processing, enter the slow path.
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*/
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fast_work_pending:
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str r0, [sp, #S_R0+S_OFF]! @ returned r0
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work_pending:
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tst r1, #_TIF_NEED_RESCHED
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bne work_resched
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/*
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* TIF_SIGPENDING or TIF_NOTIFY_RESUME must've been set if we got here
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*/
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ldr r2, [sp, #S_PSR]
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mov r0, sp @ 'regs'
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tst r2, #15 @ are we returning to user mode?
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bne no_work_pending @ no? just leave, then...
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mov r2, why @ 'syscall'
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tst r1, #_TIF_SIGPENDING @ delivering a signal?
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movne why, #0 @ prevent further restarts
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bl do_notify_resume
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b ret_slow_syscall @ Check work again
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work_resched:
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bl schedule
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/*
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* "slow" syscall return path. "why" tells us if this was a real syscall.
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*/
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ENTRY(ret_to_user)
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ret_slow_syscall:
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disable_irq @ disable interrupts
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ENTRY(ret_to_user_from_irq)
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ldr r1, [tsk, #TI_FLAGS]
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tst r1, #_TIF_WORK_MASK
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bne work_pending
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no_work_pending:
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#if defined(CONFIG_IRQSOFF_TRACER)
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asm_trace_hardirqs_on
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#endif
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/* perform architecture specific actions before user return */
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arch_ret_to_user r1, lr
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restore_user_regs fast = 0, offset = 0
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ENDPROC(ret_to_user_from_irq)
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ENDPROC(ret_to_user)
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/*
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* This is how we return from a fork.
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*/
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ENTRY(ret_from_fork)
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bl schedule_tail
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get_thread_info tsk
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ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing
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mov why, #1
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tst r1, #_TIF_SYSCALL_WORK @ are we tracing syscalls?
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beq ret_slow_syscall
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mov r1, sp
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mov r0, #1 @ trace exit [IP = 1]
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bl syscall_trace
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b ret_slow_syscall
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ENDPROC(ret_from_fork)
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.equ NR_syscalls,0
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#define CALL(x) .equ NR_syscalls,NR_syscalls+1
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#include "calls.S"
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#undef CALL
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#define CALL(x) .long x
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#ifdef CONFIG_FUNCTION_TRACER
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/*
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* When compiling with -pg, gcc inserts a call to the mcount routine at the
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* start of every function. In mcount, apart from the function's address (in
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* lr), we need to get hold of the function's caller's address.
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*
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* Older GCCs (pre-4.4) inserted a call to a routine called mcount like this:
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*
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* bl mcount
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*
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* These versions have the limitation that in order for the mcount routine to
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* be able to determine the function's caller's address, an APCS-style frame
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* pointer (which is set up with something like the code below) is required.
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*
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* mov ip, sp
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* push {fp, ip, lr, pc}
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* sub fp, ip, #4
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*
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* With EABI, these frame pointers are not available unless -mapcs-frame is
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* specified, and if building as Thumb-2, not even then.
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*
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* Newer GCCs (4.4+) solve this problem by introducing a new version of mcount,
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* with call sites like:
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*
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* push {lr}
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* bl __gnu_mcount_nc
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*
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* With these compilers, frame pointers are not necessary.
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*
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* mcount can be thought of as a function called in the middle of a subroutine
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* call. As such, it needs to be transparent for both the caller and the
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* callee: the original lr needs to be restored when leaving mcount, and no
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* registers should be clobbered. (In the __gnu_mcount_nc implementation, we
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* clobber the ip register. This is OK because the ARM calling convention
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* allows it to be clobbered in subroutines and doesn't use it to hold
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* parameters.)
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*
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* When using dynamic ftrace, we patch out the mcount call by a "mov r0, r0"
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* for the mcount case, and a "pop {lr}" for the __gnu_mcount_nc case (see
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* arch/arm/kernel/ftrace.c).
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*/
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#ifndef CONFIG_OLD_MCOUNT
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#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4))
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#error Ftrace requires CONFIG_FRAME_POINTER=y with GCC older than 4.4.0.
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#endif
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#endif
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.macro mcount_adjust_addr rd, rn
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bic \rd, \rn, #1 @ clear the Thumb bit if present
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sub \rd, \rd, #MCOUNT_INSN_SIZE
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.endm
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.macro __mcount suffix
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mcount_enter
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ldr r0, =ftrace_trace_function
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ldr r2, [r0]
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adr r0, .Lftrace_stub
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cmp r0, r2
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bne 1f
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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ldr r1, =ftrace_graph_return
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ldr r2, [r1]
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cmp r0, r2
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bne ftrace_graph_caller\suffix
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ldr r1, =ftrace_graph_entry
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ldr r2, [r1]
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ldr r0, =ftrace_graph_entry_stub
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cmp r0, r2
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bne ftrace_graph_caller\suffix
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#endif
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mcount_exit
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1: mcount_get_lr r1 @ lr of instrumented func
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mcount_adjust_addr r0, lr @ instrumented function
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adr lr, BSYM(2f)
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mov pc, r2
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2: mcount_exit
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.endm
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.macro __ftrace_caller suffix
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mcount_enter
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mcount_get_lr r1 @ lr of instrumented func
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mcount_adjust_addr r0, lr @ instrumented function
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.globl ftrace_call\suffix
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ftrace_call\suffix:
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bl ftrace_stub
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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.globl ftrace_graph_call\suffix
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ftrace_graph_call\suffix:
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mov r0, r0
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#endif
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mcount_exit
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.endm
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.macro __ftrace_graph_caller
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sub r0, fp, #4 @ &lr of instrumented routine (&parent)
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#ifdef CONFIG_DYNAMIC_FTRACE
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@ called from __ftrace_caller, saved in mcount_enter
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ldr r1, [sp, #16] @ instrumented routine (func)
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mcount_adjust_addr r1, r1
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#else
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@ called from __mcount, untouched in lr
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mcount_adjust_addr r1, lr @ instrumented routine (func)
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#endif
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mov r2, fp @ frame pointer
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bl prepare_ftrace_return
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mcount_exit
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.endm
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#ifdef CONFIG_OLD_MCOUNT
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/*
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* mcount
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*/
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.macro mcount_enter
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stmdb sp!, {r0-r3, lr}
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.endm
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.macro mcount_get_lr reg
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ldr \reg, [fp, #-4]
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.endm
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.macro mcount_exit
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ldr lr, [fp, #-4]
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ldmia sp!, {r0-r3, pc}
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.endm
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ENTRY(mcount)
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#ifdef CONFIG_DYNAMIC_FTRACE
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stmdb sp!, {lr}
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ldr lr, [fp, #-4]
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ldmia sp!, {pc}
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#else
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__mcount _old
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#endif
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ENDPROC(mcount)
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#ifdef CONFIG_DYNAMIC_FTRACE
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ENTRY(ftrace_caller_old)
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__ftrace_caller _old
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ENDPROC(ftrace_caller_old)
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#endif
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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ENTRY(ftrace_graph_caller_old)
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__ftrace_graph_caller
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ENDPROC(ftrace_graph_caller_old)
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#endif
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.purgem mcount_enter
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.purgem mcount_get_lr
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.purgem mcount_exit
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#endif
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/*
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* __gnu_mcount_nc
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*/
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.macro mcount_enter
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stmdb sp!, {r0-r3, lr}
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.endm
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.macro mcount_get_lr reg
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ldr \reg, [sp, #20]
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.endm
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.macro mcount_exit
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ldmia sp!, {r0-r3, ip, lr}
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mov pc, ip
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.endm
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ENTRY(__gnu_mcount_nc)
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#ifdef CONFIG_DYNAMIC_FTRACE
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mov ip, lr
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ldmia sp!, {lr}
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mov pc, ip
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#else
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__mcount
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#endif
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ENDPROC(__gnu_mcount_nc)
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#ifdef CONFIG_DYNAMIC_FTRACE
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ENTRY(ftrace_caller)
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__ftrace_caller
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ENDPROC(ftrace_caller)
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#endif
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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ENTRY(ftrace_graph_caller)
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__ftrace_graph_caller
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ENDPROC(ftrace_graph_caller)
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#endif
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.purgem mcount_enter
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.purgem mcount_get_lr
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.purgem mcount_exit
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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.globl return_to_handler
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return_to_handler:
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stmdb sp!, {r0-r3}
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mov r0, fp @ frame pointer
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bl ftrace_return_to_handler
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mov lr, r0 @ r0 has real ret addr
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ldmia sp!, {r0-r3}
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mov pc, lr
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#endif
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ENTRY(ftrace_stub)
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.Lftrace_stub:
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mov pc, lr
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ENDPROC(ftrace_stub)
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#endif /* CONFIG_FUNCTION_TRACER */
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/*=============================================================================
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* SWI handler
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*-----------------------------------------------------------------------------
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*/
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.align 5
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ENTRY(vector_swi)
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sub sp, sp, #S_FRAME_SIZE
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stmia sp, {r0 - r12} @ Calling r0 - r12
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ARM( add r8, sp, #S_PC )
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ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr
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THUMB( mov r8, sp )
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THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr
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mrs r8, spsr @ called from non-FIQ mode, so ok.
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str lr, [sp, #S_PC] @ Save calling PC
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str r8, [sp, #S_PSR] @ Save CPSR
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str r0, [sp, #S_OLD_R0] @ Save OLD_R0
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zero_fp
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/*
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* Get the system call number.
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*/
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#if defined(CONFIG_OABI_COMPAT)
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/*
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* If we have CONFIG_OABI_COMPAT then we need to look at the swi
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* value to determine if it is an EABI or an old ABI call.
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*/
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#ifdef CONFIG_ARM_THUMB
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tst r8, #PSR_T_BIT
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movne r10, #0 @ no thumb OABI emulation
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ldreq r10, [lr, #-4] @ get SWI instruction
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#else
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ldr r10, [lr, #-4] @ get SWI instruction
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#endif
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#ifdef CONFIG_CPU_ENDIAN_BE8
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rev r10, r10 @ little endian instruction
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#endif
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#elif defined(CONFIG_AEABI)
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/*
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* Pure EABI user space always put syscall number into scno (r7).
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*/
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#elif defined(CONFIG_ARM_THUMB)
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/* Legacy ABI only, possibly thumb mode. */
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tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
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addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in
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ldreq scno, [lr, #-4]
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#else
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/* Legacy ABI only. */
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ldr scno, [lr, #-4] @ get SWI instruction
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#endif
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#ifdef CONFIG_ALIGNMENT_TRAP
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ldr ip, __cr_alignment
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ldr ip, [ip]
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mcr p15, 0, ip, c1, c0 @ update control register
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#endif
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enable_irq
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get_thread_info tsk
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adr tbl, sys_call_table @ load syscall table pointer
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#if defined(CONFIG_OABI_COMPAT)
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/*
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* If the swi argument is zero, this is an EABI call and we do nothing.
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*
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* If this is an old ABI call, get the syscall number into scno and
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* get the old ABI syscall table address.
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*/
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bics r10, r10, #0xff000000
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eorne scno, r10, #__NR_OABI_SYSCALL_BASE
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ldrne tbl, =sys_oabi_call_table
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#elif !defined(CONFIG_AEABI)
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bic scno, scno, #0xff000000 @ mask off SWI op-code
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eor scno, scno, #__NR_SYSCALL_BASE @ check OS number
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#endif
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ldr r10, [tsk, #TI_FLAGS] @ check for syscall tracing
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stmdb sp!, {r4, r5} @ push fifth and sixth args
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#ifdef CONFIG_SECCOMP
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tst r10, #_TIF_SECCOMP
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beq 1f
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mov r0, scno
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bl __secure_computing
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add r0, sp, #S_R0 + S_OFF @ pointer to regs
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ldmia r0, {r0 - r3} @ have to reload r0 - r3
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1:
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#endif
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tst r10, #_TIF_SYSCALL_WORK @ are we tracing syscalls?
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bne __sys_trace
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cmp scno, #NR_syscalls @ check upper syscall limit
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adr lr, BSYM(ret_fast_syscall) @ return address
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ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
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add r1, sp, #S_OFF
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2: mov why, #0 @ no longer a real syscall
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cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
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eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back
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bcs arm_syscall
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b sys_ni_syscall @ not private func
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ENDPROC(vector_swi)
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/*
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* This is the really slow path. We're going to be doing
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* context switches, and waiting for our parent to respond.
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*/
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__sys_trace:
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mov r2, scno
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add r1, sp, #S_OFF
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mov r0, #0 @ trace entry [IP = 0]
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bl syscall_trace
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adr lr, BSYM(__sys_trace_return) @ return address
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mov scno, r0 @ syscall number (possibly new)
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add r1, sp, #S_R0 + S_OFF @ pointer to regs
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cmp scno, #NR_syscalls @ check upper syscall limit
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ldmccia r1, {r0 - r3} @ have to reload r0 - r3
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ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
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b 2b
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__sys_trace_return:
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str r0, [sp, #S_R0 + S_OFF]! @ save returned r0
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mov r2, scno
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mov r1, sp
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mov r0, #1 @ trace exit [IP = 1]
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bl syscall_trace
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b ret_slow_syscall
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.align 5
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#ifdef CONFIG_ALIGNMENT_TRAP
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.type __cr_alignment, #object
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__cr_alignment:
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.word cr_alignment
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#endif
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.ltorg
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/*
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* This is the syscall table declaration for native ABI syscalls.
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* With EABI a couple syscalls are obsolete and defined as sys_ni_syscall.
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*/
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#define ABI(native, compat) native
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#ifdef CONFIG_AEABI
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#define OBSOLETE(syscall) sys_ni_syscall
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#else
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#define OBSOLETE(syscall) syscall
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#endif
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.type sys_call_table, #object
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ENTRY(sys_call_table)
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#include "calls.S"
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#undef ABI
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#undef OBSOLETE
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/*============================================================================
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* Special system call wrappers
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*/
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@ r0 = syscall number
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@ r8 = syscall table
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sys_syscall:
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bic scno, r0, #__NR_OABI_SYSCALL_BASE
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cmp scno, #__NR_syscall - __NR_SYSCALL_BASE
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cmpne scno, #NR_syscalls @ check range
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stmloia sp, {r5, r6} @ shuffle args
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movlo r0, r1
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movlo r1, r2
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movlo r2, r3
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movlo r3, r4
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ldrlo pc, [tbl, scno, lsl #2]
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b sys_ni_syscall
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ENDPROC(sys_syscall)
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sys_fork_wrapper:
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add r0, sp, #S_OFF
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b sys_fork
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ENDPROC(sys_fork_wrapper)
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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_sigreturn_wrapper:
|
|
add r0, sp, #S_OFF
|
|
mov why, #0 @ prevent syscall restart handling
|
|
b sys_sigreturn
|
|
ENDPROC(sys_sigreturn_wrapper)
|
|
|
|
sys_rt_sigreturn_wrapper:
|
|
add r0, sp, #S_OFF
|
|
mov why, #0 @ prevent syscall restart handling
|
|
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 sys_mmap_pgoff
|
|
mov r0, #-EINVAL
|
|
mov pc, lr
|
|
#else
|
|
str r5, [sp, #4]
|
|
b sys_mmap_pgoff
|
|
#endif
|
|
ENDPROC(sys_mmap2)
|
|
|
|
#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
|
|
|