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

* nds32/crt0.S: Refine.
        * nds32/crt1.S: Refine.
This commit is contained in:
Jeff Johnston 2014-03-21 20:24:04 +00:00
parent 5ff6903e69
commit b899f01579
3 changed files with 53 additions and 60 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: Refine.
* nds32/crt1.S: Refine.
2014-03-21 Sabrini Ni <sabrinanitw@gmail.com>
* nds32/crt0.S: Set argc=argv=env=0.

52
libgloss/nds32/crt0.S
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@ -36,7 +36,6 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
##==============================================================================
##------------------------------------------------------------------------------
## Vector table setup
##------------------------------------------------------------------------------
@ -53,53 +52,48 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.type _start, @function
.align 2
_start:
.L_fp_gp_lp_init:
/* Initialization for $fp, $gp, and $lp. The _SDA_BASE_ location
.L_fp_gp_init:
/* Initialization for $fp and $gp. The _SDA_BASE_ location
stands for Small Data Access. */
la $fp, _FP_BASE_
la $gp, _SDA_BASE_
movi $lp, #0
.L_stack_init:
/* Initialization for $sp and make sure it is 8-byte aligned. */
la $sp, _stack
#if __NDS32_ISA_V3__
bitci $sp, $sp, #7
#else
movi $r0, #-8 /* Set $r0 as 0xFFFFFFF8. */
and $sp, $sp, $r0
#endif
.L_bss_clear:
/* Clear bss section. */
la $r3, _end
/* Clear bss section.
Equivalence C code for follow part:
if (_end == _edata) goto .L_call_main
unsinged int *ptr = _edata;
while (ptr != _end)
*ptr++ = 0
$r0 = ptr/_edata
$r1 = _end
$r2 = 0
*/
la $r0, _edata
beq $r0, $r3, .L_call_main /* Branch if no bss. */
sub $r1, $r3, $r0 /* Size to be clear. */
/* Set $r2 as how many words to be clear.
Set $r1 as how many bytes are less than a woard to be clear. */
srli $r2, $r1, #2
andi $r1, $r1, #3
beqz $r3, .Lbyte_clear
la $r4, #0x00000000
la $r1, _end
movi $r2, #0
beq $r0, $r1, .L_call_main /* Branch if no bss. */
.Lword_clear:
swi.bi $r4, [$r0], #4
addi $r2, $r2, #-1
bnez $r2, .Lword_clear /* Loop again ? */
beqz $r1, .Lend_bss
.Lbyte_clear:
sbi.bi $r4, [$r0], #1
addi $r1, $r1, #-1
bnez $r1, .Lbyte_clear
.Lend_bss:
swi.bi $r2, [$r0], #4
bne $r0, $r1, .Lword_clear
.L_call_main:
/* Prepare argc/argv/env for main function.
Since there is no operating system so far,
we set $r0, $r1, and $r2 to be zero. */
we set $r0, $r1, and $r2 to be zero.
Note: $r2 already set to zero in line 84. */
movi $r0, 0
movi $r1, 0
movi $r2, 0
/* Call 'main'. */
la $r15, main
jral $r15

48
libgloss/nds32/crt1.S
View File

@ -36,7 +36,6 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
##==============================================================================
##------------------------------------------------------------------------------
## Vector table setup
##------------------------------------------------------------------------------
@ -53,45 +52,40 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.type _start, @function
.align 2
_start:
.L_fp_gp_lp_init:
/* Initialization for $fp, $gp, and $lp. The _SDA_BASE_ location
.L_fp_gp_init:
/* Initialization for $fp and $gp. The _SDA_BASE_ location
stands for Small Data Access. */
la $fp, _FP_BASE_
la $gp, _SDA_BASE_
movi $lp, #0
.L_stack_init:
/* Initialization for $sp and make sure it is 8-byte aligned. */
la $sp, _stack
#if __NDS32_ISA_V3__
bitci $sp, $sp, #7
#else
movi $r0, #-8 /* Set $r0 as 0xFFFFFFF8. */
and $sp, $sp, $r0
#endif
.L_bss_clear:
/* Clear bss section. */
la $r3, _end
/* Clear bss section.
Equivalence C code for follow part:
if (_end == _edata) goto .L_call_main
unsinged int *ptr = _edata;
while (ptr != _end)
*ptr++ = 0
$r0 = ptr/_edata
$r1 = _end
$r2 = 0
*/
la $r0, _edata
beq $r0, $r3, .L_call_main /* Branch if no bss. */
sub $r1, $r3, $r0 /* Size to be clear. */
/* Set $r2 as how many words to be clear.
Set $r1 as how many bytes are less than a woard to be clear. */
srli $r2, $r1, #2
andi $r1, $r1, #3
beqz $r3, .Lbyte_clear
la $r4, #0x00000000
la $r1, _end
beq $r0, $r1, .L_call_main /* Branch if no bss. */
movi $r2, #0
.Lword_clear:
swi.bi $r4, [$r0], #4
addi $r2, $r2, #-1
bnez $r2, .Lword_clear /* Loop again ? */
beqz $r1, .Lend_bss
.Lbyte_clear:
sbi.bi $r4, [$r0], #1
addi $r1, $r1, #-1
bnez $r1, .Lbyte_clear
.Lend_bss:
swi.bi $r2, [$r0], #4
bne $r0, $r1, .Lword_clear
.L_call_main:
/* Call '_init' to invoke constructors. */