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git://sourceware.org/git/newlib-cygwin.git
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ec119e1084
Basically the startup code needs to clear memory from _edata to _end. In the past it's been done with a fairly naive copy loop. This changes the code to just call memset and let memset figure out a sensible way to handle the operation given the size and alignment requirements. I don't have performance data on this. I cobbled it together some time ago in response to seeing some of the GCC tests with larger .bss sections taking an insane amount of time to just get from _start to main. With the fixes to the H8 decoder in the simulator it may not matter nearly as much anymore. This has been in my tester for months. Naturally it does not cause any regressions in the H8 port.
100 lines
1.3 KiB
ArmAsm
100 lines
1.3 KiB
ArmAsm
; h8/300 and h8/300h start up file.
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#include "setarch.h"
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#ifdef __H8300__
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.section .text
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.global _start
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_start:
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mov.w #_stack,sp
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mov.w #_edata,r0
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mov.w #_end,r2
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sub.w r1,r1
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sub.w r0,r2
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jsr @_memset
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#ifdef __ELF__
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mov.l #__fini,r0
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jsr @_atexit
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#ifdef __SIMULATOR__
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jsr @0xcc
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#endif
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jsr @__init
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#else
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#ifdef __SIMULATOR__
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jsr @0xcc
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#endif
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jsr @___main
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#endif
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jsr @_main
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jsr @_exit
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.section .stack
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_stack: .word 1
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#endif
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#ifdef __H8300H__
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.section .text
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.global _start
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_start:
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mov.l #_stack,sp
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mov.l #_edata,er0
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mov.l #_end,er2
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sub.w r1,r1
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sub.l er0,er2
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jsr @_memset
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#ifdef __ELF__
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mov.l #__fini,er0
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jsr @_atexit
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#ifdef __SIMULATOR__
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jsr @0xcc
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#endif
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jsr @__init
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#else
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#ifdef __SIMULATOR__
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jsr @0xcc
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#endif
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jsr @___main
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#endif
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jsr @_main
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jsr @_exit
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.section .stack
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_stack: .long 1
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#endif
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#if defined (__H8300S__) || defined (__H8300SX__)
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.section .text
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.global _start
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_start:
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mov.l #_stack,sp
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mov.l #_edata,er0
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mov.l #_end,er2
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sub.w r1,r1
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sub.l er0,er2
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jsr @_memset
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#ifdef __ELF__
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mov.l #__fini,er0
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jsr @_atexit
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#ifdef __SIMULATOR__
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jsr @0xcc
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#endif
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jsr @__init
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#else
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#ifdef __SIMULATOR__
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jsr @0xcc
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#endif
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jsr @___main
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#endif
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jsr @_main
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jsr @_exit
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.section .stack
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_stack: .long 1
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#endif
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