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2014-03-21 Sabrini Ni <sabrinanitw@gmail.com>

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* nds32/crt0.S: Tweak initialization sqeuence.
        * nds32/crt1.S: Ditto.
This commit is contained in:
Jeff Johnston 2014-03-21 21:16:40 +00:00
parent 7f6278bc08
commit c94fff60f1
3 changed files with 55 additions and 38 deletions
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5
libgloss/ChangeLog
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@ -1,3 +1,8 @@
2014-03-21 Sabrini Ni <sabrinanitw@gmail.com>
* nds32/crt0.S: Tweak initialization sqeuence.
* nds32/crt1.S: Ditto.
2014-03-21 Sabrini Ni <sabrinanitw@gmail.com>
* nds32/_argv.S: Replace syscall with break.

44
libgloss/nds32/crt0.S
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@ -1,5 +1,5 @@
/*
Copyright (c) 2013 Andes Technology Corporation.
Copyright (c) 2013-2014 Andes Technology Corporation.
All rights reserved.
Redistribution and use in source and binary forms, with or without
@ -47,29 +47,22 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##------------------------------------------------------------------------------
.section .text
.weak _SDA_BASE_
.weak _FP_BASE_
.global _start
.type _start, @function
.align 2
_start:
.L_hw_config:
#if __NDS32_EX9_EXT__
/* Initialize the table base of EX9 instruction. */
mfsr $r0, $MSC_CFG /* Check if support EIT. */
srli $r0, $r0, 24
andi $r0, $r0, 0x1
beqz $r0, .L_fp_gp_init
la $r0, $_ITB_BASE_ /* Init ITB. */
mtusr $r0, $ITB
#endif
/* The initialization sequence really does matter !!!
The global pointer must be
initialized precedence over all others. */
.L_fp_gp_init:
/* Initialization for $gp. The _SDA_BASE_ location
stands for Small Data Access. */
.L_init_gp:
/* Initialization for global pointer. The symbol _SDA_BASE_ is
determined by Linker. SDA stands for Small Data Access. */
la $gp, _SDA_BASE_
.L_stack_init:
/* Initialization for $sp and make sure it is 8-byte aligned. */
.L_init_sp:
/* Initialization for stack pointe. The symbol _stack is defined
in linker script. Make sure $sp is 8-byte aligned. */
la $sp, _stack
#if __NDS32_ISA_V3__
bitci $sp, $sp, #7
@ -78,8 +71,21 @@ _start:
and $sp, $sp, $r0
#endif
.L_bss_clear:
/* Clear bss section.
#if __NDS32_EX9_EXT__
.L_init_itb:
/* Initialization for Instruction Table Base (ITB).
The symbol $_ITB_BASE_ is determined by Linker.
Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set. */
mfsr $r0, $MSC_CFG
srli $r0, $r0, 24
andi $r0, $r0, 0x1
beqz $r0, .L_zero_out_bss /* Fall through ? */
la $r0, $_ITB_BASE_
mtusr $r0, $ITB
#endif
.L_zero_out_bss:
/* Zero out the bss section.
Equivalence C code for follow part:
if (_end == _edata) goto .L_call_main
unsinged int *ptr = _edata;

44
libgloss/nds32/crt1.S
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@ -1,5 +1,5 @@
/*
Copyright (c) 2013 Andes Technology Corporation.
Copyright (c) 2013-2014 Andes Technology Corporation.
All rights reserved.
Redistribution and use in source and binary forms, with or without
@ -47,29 +47,22 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##------------------------------------------------------------------------------
.section .text
.weak _SDA_BASE_
.weak _FP_BASE_
.global _start
.type _start, @function
.align 2
_start:
.L_hw_config:
#if __NDS32_EX9_EXT__
/* Initialize the table base of EX9 instruction. */
mfsr $r0, $MSC_CFG /* Check if support EIT. */
srli $r0, $r0, 24
andi $r0, $r0, 0x1
beqz $r0, .L_fp_gp_init
la $r0, $_ITB_BASE_ /* Init ITB. */
mtusr $r0, $ITB
#endif
/* The initialization sequence really does matter !!!
The global pointer must be
initialized precedence over all others. */
.L_fp_gp_init:
/* Initialization for $gp. The _SDA_BASE_ location
stands for Small Data Access. */
.L_init_gp:
/* Initialization for global pointer. The symbol _SDA_BASE_ is
determined by Linker. SDA stands for Small Data Access. */
la $gp, _SDA_BASE_
.L_stack_init:
/* Initialization for $sp and make sure it is 8-byte aligned. */
.L_init_sp:
/* Initialization for stack pointe. The symbol _stack is defined
in linker script. Make sure $sp is 8-byte aligned. */
la $sp, _stack
#if __NDS32_ISA_V3__
bitci $sp, $sp, #7
@ -78,8 +71,21 @@ _start:
and $sp, $sp, $r0
#endif
.L_bss_clear:
/* Clear bss section.
#if __NDS32_EX9_EXT__
.L_init_itb:
/* Initialization for Instruction Table Base (ITB).
The symbol $_ITB_BASE_ is determined by Linker.
Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set. */
mfsr $r0, $MSC_CFG
srli $r0, $r0, 24
andi $r0, $r0, 0x1
beqz $r0, .L_zero_out_bss /* Fall through ? */
la $r0, $_ITB_BASE_
mtusr $r0, $ITB
#endif
.L_zero_out_bss:
/* Zero out the bss section.
Equivalence C code for follow part:
if (_end == _edata) goto .L_call_main
unsinged int *ptr = _edata;