725 lines
15 KiB
ArmAsm
725 lines
15 KiB
ArmAsm
/* Copyright (C) 2000-2017 Free Software Foundation, Inc.
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This file was pretty much copied from newlib.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "crt.h"
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#ifdef MMU_SUPPORT
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/* Section used for exception/timer interrupt stack area */
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.section .data.vbr.stack,"aw"
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.align 4
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.global __ST_VBR
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__ST_VBR:
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.zero 1024 * 2 /* ; 2k for VBR handlers */
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/* Label at the highest stack address where the stack grows from */
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__timer_stack:
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#endif /* MMU_SUPPORT */
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/* ;----------------------------------------
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Normal newlib crt1.S */
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! make a place to keep any previous value of the vbr register
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! this will only have a value if it has been set by redboot (for example)
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.section .bss
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old_vbr:
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.long 0
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#ifdef PROFILE
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profiling_enabled:
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.long 0
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#endif
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.section .text
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.global start
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.import ___rtos_profiler_start_timer
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.weak ___rtos_profiler_start_timer
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start:
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mov.l stack_k,r15
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#if defined (__SH3__) || (defined (__SH_FPU_ANY__) && ! defined (__SH2E__) && ! defined (__SH2A__)) || defined (__SH4_NOFPU__)
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#define VBR_SETUP
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! before zeroing the bss ...
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! if the vbr is already set to vbr_start then the program has been restarted
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! (i.e. it is not the first time the program has been run since reset)
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! reset the vbr to its old value before old_vbr (in bss) is wiped
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! this ensures that the later code does not create a circular vbr chain
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stc vbr, r1
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mov.l vbr_start_k, r2
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cmp/eq r1, r2
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bf 0f
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! reset the old vbr value
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mov.l old_vbr_k, r1
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mov.l @r1, r2
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ldc r2, vbr
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0:
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#endif /* VBR_SETUP */
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! zero out bss
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mov.l edata_k,r0
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mov.l end_k,r1
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mov #0,r2
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start_l:
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mov.l r2,@r0
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add #4,r0
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cmp/ge r0,r1
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bt start_l
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#if defined (__SH_FPU_ANY__)
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mov.l set_fpscr_k, r1
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mov #4,r4
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jsr @r1
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shll16 r4 ! Set DN bit (flush denormal inputs to zero)
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lds r3,fpscr ! Switch to default precision
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#endif /* defined (__SH_FPU_ANY__) */
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#ifdef VBR_SETUP
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! save the existing contents of the vbr
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! there will only be a prior value when using something like redboot
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! otherwise it will be zero
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stc vbr, r1
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mov.l old_vbr_k, r2
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mov.l r1, @r2
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! setup vbr
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mov.l vbr_start_k, r1
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ldc r1,vbr
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#endif /* VBR_SETUP */
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! if an rtos is exporting a timer start fn,
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! then pick up an SR which does not enable ints
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! (the rtos will take care of this)
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mov.l rtos_start_fn, r0
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mov.l sr_initial_bare, r1
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tst r0, r0
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bt set_sr
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mov.l sr_initial_rtos, r1
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set_sr:
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! Set status register (sr)
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ldc r1, sr
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! arrange for exit to call fini
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mov.l atexit_k,r0
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mov.l fini_k,r4
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jsr @r0
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nop
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#ifdef PROFILE
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! arrange for exit to call _mcleanup (via stop_profiling)
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mova stop_profiling,r0
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mov.l atexit_k,r1
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jsr @r1
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mov r0, r4
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! Call profiler startup code
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mov.l monstartup_k, r0
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mov.l start_k, r4
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mov.l etext_k, r5
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jsr @r0
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nop
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! enable profiling trap
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! until now any trap 33s will have been ignored
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! This means that all library functions called before this point
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! (directly or indirectly) may have the profiling trap at the start.
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! Therefore, only mcount itself may not have the extra header.
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mov.l profiling_enabled_k2, r0
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mov #1, r1
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mov.l r1, @r0
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#endif /* PROFILE */
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! call init
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mov.l init_k,r0
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jsr @r0
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nop
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! call the mainline
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mov.l main_k,r0
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jsr @r0
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nop
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! call exit
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mov r0,r4
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mov.l exit_k,r0
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jsr @r0
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nop
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.balign 4
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#ifdef PROFILE
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stop_profiling:
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# stop mcount counting
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mov.l profiling_enabled_k2, r0
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mov #0, r1
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mov.l r1, @r0
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# call mcleanup
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mov.l mcleanup_k, r0
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jmp @r0
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nop
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.balign 4
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mcleanup_k:
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.long __mcleanup
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monstartup_k:
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.long ___monstartup
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profiling_enabled_k2:
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.long profiling_enabled
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start_k:
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.long _start
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etext_k:
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.long __etext
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#endif /* PROFILE */
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.align 2
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#if defined (__SH_FPU_ANY__)
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set_fpscr_k:
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.long ___set_fpscr
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#endif /* defined (__SH_FPU_ANY__) */
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stack_k:
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.long _stack
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edata_k:
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.long _edata
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end_k:
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.long _end
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main_k:
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.long ___setup_argv_and_call_main
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exit_k:
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.long _exit
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atexit_k:
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.long _atexit
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init_k:
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.long GLOBAL(_init)
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fini_k:
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.long GLOBAL(_fini)
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#ifdef VBR_SETUP
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old_vbr_k:
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.long old_vbr
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vbr_start_k:
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.long vbr_start
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#endif /* VBR_SETUP */
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sr_initial_rtos:
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! Privileged mode RB 1 BL 0. Keep BL 0 to allow default trap handlers to work.
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! Whether profiling or not, keep interrupts masked,
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! the RTOS will enable these if required.
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.long 0x600000f1
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rtos_start_fn:
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.long ___rtos_profiler_start_timer
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#ifdef PROFILE
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sr_initial_bare:
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! Privileged mode RB 1 BL 0. Keep BL 0 to allow default trap handlers to work.
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! For bare machine, we need to enable interrupts to get profiling working
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.long 0x60000001
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#else
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sr_initial_bare:
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! Privileged mode RB 1 BL 0. Keep BL 0 to allow default trap handlers to work.
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! Keep interrupts disabled - the application will enable as required.
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.long 0x600000f1
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#endif
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! supplied for backward compatibility only, in case of linking
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! code whose main() was compiled with an older version of GCC.
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.global ___main
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___main:
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rts
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nop
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#ifdef VBR_SETUP
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! Exception handlers
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.section .text.vbr, "ax"
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vbr_start:
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.org 0x100
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vbr_100:
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#ifdef PROFILE
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! Note on register usage.
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! we use r0..r3 as scratch in this code. If we are here due to a trapa for profiling
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! then this is OK as we are just before executing any function code.
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! The other r4..r7 we save explicityl on the stack
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! Remaining registers are saved by normal ABI conventions and we assert we do not
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! use floating point registers.
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mov.l expevt_k1, r1
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mov.l @r1, r1
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mov.l event_mask, r0
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and r0,r1
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mov.l trapcode_k, r2
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cmp/eq r1,r2
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bt 1f
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bra handler_100 ! if not a trapa, go to default handler
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nop
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1:
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mov.l trapa_k, r0
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mov.l @r0, r0
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shlr2 r0 ! trapa code is shifted by 2.
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cmp/eq #33, r0
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bt 2f
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bra handler_100
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nop
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2:
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! If here then it looks like we have trap #33
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! Now we need to call mcount with the following convention
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! Save and restore r4..r7
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mov.l r4,@-r15
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mov.l r5,@-r15
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mov.l r6,@-r15
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mov.l r7,@-r15
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sts.l pr,@-r15
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! r4 is frompc.
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! r5 is selfpc
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! r0 is the branch back address.
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! The code sequence emitted by gcc for the profiling trap is
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! .align 2
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! trapa #33
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! .align 2
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! .long lab Where lab is planted by the compiler. This is the address
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! of a datum that needs to be incremented.
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sts pr, r4 ! frompc
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stc spc, r5 ! selfpc
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mov #2, r2
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not r2, r2 ! pattern to align to 4
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and r2, r5 ! r5 now has aligned address
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! add #4, r5 ! r5 now has address of address
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mov r5, r2 ! Remember it.
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! mov.l @r5, r5 ! r5 has value of lable (lab in above example)
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add #8, r2
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ldc r2, spc ! our return address avoiding address word
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! only call mcount if profiling is enabled
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mov.l profiling_enabled_k, r0
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mov.l @r0, r0
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cmp/eq #0, r0
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bt 3f
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! call mcount
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mov.l mcount_k, r2
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jsr @r2
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nop
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3:
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lds.l @r15+,pr
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mov.l @r15+,r7
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mov.l @r15+,r6
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mov.l @r15+,r5
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mov.l @r15+,r4
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rte
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nop
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.balign 4
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event_mask:
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.long 0xfff
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trapcode_k:
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.long 0x160
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expevt_k1:
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.long 0xff000024 ! Address of expevt
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trapa_k:
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.long 0xff000020
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mcount_k:
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.long __call_mcount
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profiling_enabled_k:
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.long profiling_enabled
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#endif
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! Non profiling case.
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handler_100:
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mov.l 2f, r0 ! load the old vbr setting (if any)
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mov.l @r0, r0
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cmp/eq #0, r0
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bf 1f
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! no previous vbr - jump to own generic handler
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bra handler
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nop
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1: ! there was a previous handler - chain them
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add #0x7f, r0 ! 0x7f
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add #0x7f, r0 ! 0xfe
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add #0x2, r0 ! add 0x100 without corrupting another register
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jmp @r0
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nop
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.balign 4
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2:
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.long old_vbr
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.org 0x400
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vbr_400: ! Should be at vbr+0x400
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mov.l 2f, r0 ! load the old vbr setting (if any)
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mov.l @r0, r0
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cmp/eq #0, r0
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! no previous vbr - jump to own generic handler
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bt handler
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! there was a previous handler - chain them
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rotcr r0
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rotcr r0
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add #0x7f, r0 ! 0x1fc
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add #0x7f, r0 ! 0x3f8
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add #0x02, r0 ! 0x400
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rotcl r0
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rotcl r0 ! Add 0x400 without corrupting another register
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jmp @r0
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nop
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.balign 4
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2:
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.long old_vbr
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handler:
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/* If the trap handler is there call it */
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mov.l superh_trap_handler_k, r0
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cmp/eq #0, r0 ! True if zero.
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bf 3f
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bra chandler
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nop
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3:
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! Here handler available, call it.
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/* Now call the trap handler with as much of the context unchanged as possible.
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Move trapping address into PR to make it look like the trap point */
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stc spc, r1
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lds r1, pr
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mov.l expevt_k, r4
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mov.l @r4, r4 ! r4 is value of expevt, first parameter.
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mov r1, r5 ! Remember trapping pc.
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mov r1, r6 ! Remember trapping pc.
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mov.l chandler_k, r1
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mov.l superh_trap_handler_k, r2
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! jmp to trap handler to avoid disturbing pr.
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jmp @r2
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nop
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.org 0x600
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vbr_600:
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#ifdef PROFILE
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! Should be at vbr+0x600
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! Now we are in the land of interrupts so need to save more state.
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! Save register state
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mov.l interrupt_stack_k, r15 ! r15 has been saved to sgr.
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mov.l r0,@-r15
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mov.l r1,@-r15
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mov.l r2,@-r15
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mov.l r3,@-r15
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mov.l r4,@-r15
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mov.l r5,@-r15
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mov.l r6,@-r15
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mov.l r7,@-r15
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sts.l pr,@-r15
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sts.l mach,@-r15
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sts.l macl,@-r15
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#if defined(__SH_FPU_ANY__)
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! Save fpul and fpscr, save fr0-fr7 in 64 bit mode
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! and set the pervading precision for the timer_handler
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mov #0,r0
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sts.l fpul,@-r15
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sts.l fpscr,@-r15
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lds r0,fpscr ! Clear fpscr
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fmov fr0,@-r15
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fmov fr1,@-r15
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fmov fr2,@-r15
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fmov fr3,@-r15
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mov.l pervading_precision_k,r0
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fmov fr4,@-r15
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fmov fr5,@-r15
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mov.l @r0,r0
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fmov fr6,@-r15
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fmov fr7,@-r15
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lds r0,fpscr
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#endif /* __SH_FPU_ANY__ */
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! Pass interrupted pc to timer_handler as first parameter (r4).
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stc spc, r4
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mov.l timer_handler_k, r0
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jsr @r0
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nop
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#if defined(__SH_FPU_ANY__)
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mov #0,r0
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lds r0,fpscr ! Clear the fpscr
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fmov @r15+,fr7
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fmov @r15+,fr6
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fmov @r15+,fr5
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fmov @r15+,fr4
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fmov @r15+,fr3
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fmov @r15+,fr2
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fmov @r15+,fr1
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fmov @r15+,fr0
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lds.l @r15+,fpscr
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lds.l @r15+,fpul
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#endif /* __SH_FPU_ANY__ */
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lds.l @r15+,macl
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lds.l @r15+,mach
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lds.l @r15+,pr
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mov.l @r15+,r7
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mov.l @r15+,r6
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mov.l @r15+,r5
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mov.l @r15+,r4
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mov.l @r15+,r3
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mov.l @r15+,r2
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mov.l @r15+,r1
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mov.l @r15+,r0
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stc sgr, r15 ! Restore r15, destroyed by this sequence.
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rte
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nop
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#if defined(__SH_FPU_ANY__)
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.balign 4
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pervading_precision_k:
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.long GLOBAL(__fpscr_values)+4
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#endif
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#else
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mov.l 2f, r0 ! Load the old vbr setting (if any).
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mov.l @r0, r0
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cmp/eq #0, r0
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! no previous vbr - jump to own handler
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bt chandler
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! there was a previous handler - chain them
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rotcr r0
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rotcr r0
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add #0x7f, r0 ! 0x1fc
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add #0x7f, r0 ! 0x3f8
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add #0x7f, r0 ! 0x5f4
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add #0x03, r0 ! 0x600
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rotcl r0
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rotcl r0 ! Add 0x600 without corrupting another register
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jmp @r0
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nop
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.balign 4
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2:
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.long old_vbr
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#endif /* PROFILE code */
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chandler:
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mov.l expevt_k, r4
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mov.l @r4, r4 ! r4 is value of expevt hence making this the return code
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mov.l handler_exit_k,r0
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jsr @r0
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nop
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! We should never return from _exit but in case we do we would enter the
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! the following tight loop
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limbo:
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bra limbo
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nop
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.balign 4
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#ifdef PROFILE
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interrupt_stack_k:
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.long __timer_stack ! The high end of the stack
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timer_handler_k:
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.long __profil_counter
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#endif
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expevt_k:
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.long 0xff000024 ! Address of expevt
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chandler_k:
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.long chandler
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superh_trap_handler_k:
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.long __superh_trap_handler
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handler_exit_k:
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.long _exit
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.align 2
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! Simulated compile of trap handler.
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.section .debug_abbrev,"",@progbits
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.Ldebug_abbrev0:
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.section .debug_info,"",@progbits
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.Ldebug_info0:
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.section .debug_line,"",@progbits
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.Ldebug_line0:
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.text
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.Ltext0:
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.align 5
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.type __superh_trap_handler,@function
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__superh_trap_handler:
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.LFB1:
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mov.l r14,@-r15
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.LCFI0:
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add #-4,r15
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.LCFI1:
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mov r15,r14
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.LCFI2:
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mov.l r4,@r14
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lds r1, pr
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add #4,r14
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mov r14,r15
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mov.l @r15+,r14
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rts
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nop
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.LFE1:
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.Lfe1:
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.size __superh_trap_handler,.Lfe1-__superh_trap_handler
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.section .debug_frame,"",@progbits
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.Lframe0:
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.ualong .LECIE0-.LSCIE0
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.LSCIE0:
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.ualong 0xffffffff
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.byte 0x1
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.string ""
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.uleb128 0x1
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.sleb128 -4
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.byte 0x11
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.byte 0xc
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.uleb128 0xf
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.uleb128 0x0
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.align 2
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.LECIE0:
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.LSFDE0:
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.ualong .LEFDE0-.LASFDE0
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.LASFDE0:
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.ualong .Lframe0
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.ualong .LFB1
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.ualong .LFE1-.LFB1
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.byte 0x4
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.ualong .LCFI0-.LFB1
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.byte 0xe
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.uleb128 0x4
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.byte 0x4
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.ualong .LCFI1-.LCFI0
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.byte 0xe
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.uleb128 0x8
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.byte 0x8e
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.uleb128 0x1
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.byte 0x4
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.ualong .LCFI2-.LCFI1
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.byte 0xd
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.uleb128 0xe
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.align 2
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.LEFDE0:
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.text
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.Letext0:
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.section .debug_info
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.ualong 0xb3
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.uaword 0x2
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.ualong .Ldebug_abbrev0
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.byte 0x4
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.uleb128 0x1
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.ualong .Ldebug_line0
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.ualong .Letext0
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.ualong .Ltext0
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.string "trap_handler.c"
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.string "xxxxxxxxxxxxxxxxxxxxxxxxxxxx"
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.string "GNU C 3.2 20020529 (experimental)"
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.byte 0x1
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.uleb128 0x2
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.ualong 0xa6
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.byte 0x1
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.string "_superh_trap_handler"
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.byte 0x1
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.byte 0x2
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.byte 0x1
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.ualong .LFB1
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.ualong .LFE1
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.byte 0x1
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.byte 0x5e
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.uleb128 0x3
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.string "trap_reason"
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.byte 0x1
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.byte 0x1
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.ualong 0xa6
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.byte 0x2
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.byte 0x91
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.sleb128 0
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.byte 0x0
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|
.uleb128 0x4
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.string "unsigned int"
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.byte 0x4
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.byte 0x7
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.byte 0x0
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.section .debug_abbrev
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.uleb128 0x1
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|
.uleb128 0x11
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|
.byte 0x1
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|
.uleb128 0x10
|
|
.uleb128 0x6
|
|
.uleb128 0x12
|
|
.uleb128 0x1
|
|
.uleb128 0x11
|
|
.uleb128 0x1
|
|
.uleb128 0x3
|
|
.uleb128 0x8
|
|
.uleb128 0x1b
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|
.uleb128 0x8
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|
.uleb128 0x25
|
|
.uleb128 0x8
|
|
.uleb128 0x13
|
|
.uleb128 0xb
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|
.byte 0x0
|
|
.byte 0x0
|
|
.uleb128 0x2
|
|
.uleb128 0x2e
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|
.byte 0x1
|
|
.uleb128 0x1
|
|
.uleb128 0x13
|
|
.uleb128 0x3f
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|
.uleb128 0xc
|
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.uleb128 0x3
|
|
.uleb128 0x8
|
|
.uleb128 0x3a
|
|
.uleb128 0xb
|
|
.uleb128 0x3b
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|
.uleb128 0xb
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.uleb128 0x27
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.uleb128 0xc
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.uleb128 0x11
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.uleb128 0x1
|
|
.uleb128 0x12
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|
.uleb128 0x1
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|
.uleb128 0x40
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|
.uleb128 0xa
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.byte 0x0
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|
.byte 0x0
|
|
.uleb128 0x3
|
|
.uleb128 0x5
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|
.byte 0x0
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|
.uleb128 0x3
|
|
.uleb128 0x8
|
|
.uleb128 0x3a
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|
.uleb128 0xb
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|
.uleb128 0x3b
|
|
.uleb128 0xb
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|
.uleb128 0x49
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|
.uleb128 0x13
|
|
.uleb128 0x2
|
|
.uleb128 0xa
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|
.byte 0x0
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|
.byte 0x0
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|
.uleb128 0x4
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|
.uleb128 0x24
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|
.byte 0x0
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|
.uleb128 0x3
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|
.uleb128 0x8
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|
.uleb128 0xb
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.uleb128 0xb
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|
.uleb128 0x3e
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.uleb128 0xb
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|
.byte 0x0
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|
.byte 0x0
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|
.byte 0x0
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.section .debug_pubnames,"",@progbits
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.ualong 0x27
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.uaword 0x2
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.ualong .Ldebug_info0
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.ualong 0xb7
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.ualong 0x67
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.string "_superh_trap_handler"
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.ualong 0x0
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|
.section .debug_aranges,"",@progbits
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|
.ualong 0x1c
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|
.uaword 0x2
|
|
.ualong .Ldebug_info0
|
|
.byte 0x4
|
|
.byte 0x0
|
|
.uaword 0x0
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.uaword 0x0
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.ualong .Ltext0
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.ualong .Letext0-.Ltext0
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.ualong 0x0
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.ualong 0x0
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|
#endif /* VBR_SETUP */
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