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* msp430/Makefile.in (crt0-minrt.o, crtn-minrt.o): New. Build

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from crt0.S with -DMINRT.
(CRT_OBJS): Expand.
(crt_%.o): New rule pattern.  Build multiple objects from crt0.S.
* msp430/crt0.S: Further break out functionality.  Support -DMINRT
that omits all init/fini logic.
* msp430/crtn.S: Likewise.
* msp430/msp430-sim.ld: Wildcard all .crt_* sections, sorted.
* msp430/msp430.ld: Likewise.
* msp430/msp430xl-sim.ld: Likewise.
This commit is contained in:
DJ Delorie
2014-01-30 02:46:34 +00:00
parent 25833f57c1
commit ed94d4a4aa
7 changed files with 96 additions and 24 deletions
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57
libgloss/msp430/crt0.S
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@@ -13,18 +13,38 @@
#include "memmodel.h"
;; The linker links all .crt_* sections in asciibetical order at the
;; same place. So, the four digits in .crt_NNNN determine the link
;; order, so, keep them in sequential order here. The first two
;; digits are set here, the second two allow users to insert code
;; between code fragments here.
#if L0
.section ".resetvec", "a"
__msp430_resetvec_hook:
.word __start
.section ".lowtext", "ax", @progbits
.section ".crt_0000init", "ax", @progbits
.refsym __msp430_resetvec_hook
#ifdef MINRT
.refsym __crt0_call_just_main
#else
.refsym __crt0_call_init_then_main
#endif
.global __start
__start:
mov_ #__stack, R1
;; Disable watchdog timer.
MOV #0x5a80, &0x15C
#endif
#if Lbss
.section ".crt_0100bss", "ax", @progbits
.global __crt0_init_bss
__crt0_init_bss:
mov_ #__bssstart, R12
clr.w R13
mov.w #__bsssize, R14
@@ -32,7 +52,14 @@ __start:
clr.w R15 ; We assume that __bsssize is never > 64M
#endif
call_ #memset
#endif
#if Lmovedata
.section ".crt_0200movedata", "ax", @progbits
.global __crt0_movedata
__crt0_movedata:
mov_ #__datastart, R12
mov_ #__romdatastart, R13
@@ -46,17 +73,38 @@ __start:
#endif
call_ #memmove
1:
#endif
#if Lmain_minrt
.section ".crt_0300main", "ax", @progbits
.global __crt0_call_just_main
__crt0_call_just_main:
clr.w R12 ; Set argc == 0
call_ #main
#endif
#if Lmain
.section ".crt_0300main", "ax", @progbits
.global __crt0_call_init_then_main
__crt0_call_init_then_main:
call_ #__msp430_init
clr.w R12 ; Set argc == 0
call_ #main
#endif
#if Lcallexit
.section ".crt_0400main_exit", "ax", @progbits
.global __crt0_call_exit
__crt0_call_exit:
call_ #_exit
.word __msp430_resetvec_hook
#endif
;----------------------------------------
#ifndef MINRT
#if L0
.section ".crt_0500main_init", "ax", @progbits
.global _msp430_run_init_array
.type _msp430_run_init_array,@function
_msp430_run_init_array:
@@ -104,3 +152,6 @@ __msp430_init:
.global __msp430_fini
__msp430_fini:
call_ #_msp430_run_fini_array
#endif
#endif