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

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* 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> 2014-03-21 Sabrini Ni <sabrinanitw@gmail.com>
* nds32/crt0.S: Set argc=argv=env=0. * nds32/crt0.S: Set argc=argv=env=0.

56
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 ## Vector table setup
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
@@ -53,53 +52,48 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.type _start, @function .type _start, @function
.align 2 .align 2
_start: _start:
.L_fp_gp_lp_init: .L_fp_gp_init:
/* Initialization for $fp, $gp, and $lp. The _SDA_BASE_ location /* Initialization for $fp and $gp. The _SDA_BASE_ location
stands for Small Data Access. */ stands for Small Data Access. */
la $fp, _FP_BASE_ la $fp, _FP_BASE_
la $gp, _SDA_BASE_ la $gp, _SDA_BASE_
movi $lp, #0
.L_stack_init: .L_stack_init:
/* Initialization for $sp and make sure it is 8-byte aligned. */ /* Initialization for $sp and make sure it is 8-byte aligned. */
la $sp, _stack la $sp, _stack
#if __NDS32_ISA_V3__
bitci $sp, $sp, #7
#else
movi $r0, #-8 /* Set $r0 as 0xFFFFFFF8. */ movi $r0, #-8 /* Set $r0 as 0xFFFFFFF8. */
and $sp, $sp, $r0 and $sp, $sp, $r0
#endif
.L_bss_clear: .L_bss_clear:
/* Clear bss section. */ /* Clear bss section.
la $r3, _end Equivalence C code for follow part:
la $r0, _edata if (_end == _edata) goto .L_call_main
beq $r0, $r3, .L_call_main /* Branch if no bss. */ unsinged int *ptr = _edata;
sub $r1, $r3, $r0 /* Size to be clear. */ while (ptr != _end)
*ptr++ = 0
/* Set $r2 as how many words to be clear. $r0 = ptr/_edata
Set $r1 as how many bytes are less than a woard to be clear. */ $r1 = _end
srli $r2, $r1, #2 $r2 = 0
andi $r1, $r1, #3 */
beqz $r3, .Lbyte_clear la $r0, _edata
la $r1, _end
la $r4, #0x00000000 movi $r2, #0
beq $r0, $r1, .L_call_main /* Branch if no bss. */
.Lword_clear: .Lword_clear:
swi.bi $r4, [$r0], #4 swi.bi $r2, [$r0], #4
addi $r2, $r2, #-1 bne $r0, $r1, .Lword_clear
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:
.L_call_main: .L_call_main:
/* Prepare argc/argv/env for main function. /* Prepare argc/argv/env for main function.
Since there is no operating system so far, 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 $r0, 0
movi $r1, 0 movi $r1, 0
movi $r2, 0
/* Call 'main'. */ /* Call 'main'. */
la $r15, main la $r15, main
jral $r15 jral $r15
@@ -118,6 +112,6 @@ _start:
.L_forever_loop: .L_forever_loop:
/* Should never return here. */ /* Should never return here. */
b .L_forever_loop b .L_forever_loop
.size _start, .-_start .size _start, .-_start

52
libgloss/nds32/crt1.S
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@@ -36,7 +36,6 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## ##
##============================================================================== ##==============================================================================
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
## Vector table setup ## Vector table setup
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
@@ -53,45 +52,40 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.type _start, @function .type _start, @function
.align 2 .align 2
_start: _start:
.L_fp_gp_lp_init: .L_fp_gp_init:
/* Initialization for $fp, $gp, and $lp. The _SDA_BASE_ location /* Initialization for $fp and $gp. The _SDA_BASE_ location
stands for Small Data Access. */ stands for Small Data Access. */
la $fp, _FP_BASE_ la $fp, _FP_BASE_
la $gp, _SDA_BASE_ la $gp, _SDA_BASE_
movi $lp, #0
.L_stack_init: .L_stack_init:
/* Initialization for $sp and make sure it is 8-byte aligned. */ /* Initialization for $sp and make sure it is 8-byte aligned. */
la $sp, _stack la $sp, _stack
#if __NDS32_ISA_V3__
bitci $sp, $sp, #7
#else
movi $r0, #-8 /* Set $r0 as 0xFFFFFFF8. */ movi $r0, #-8 /* Set $r0 as 0xFFFFFFF8. */
and $sp, $sp, $r0 and $sp, $sp, $r0
#endif
.L_bss_clear: .L_bss_clear:
/* Clear bss section. */ /* Clear bss section.
la $r3, _end Equivalence C code for follow part:
la $r0, _edata if (_end == _edata) goto .L_call_main
beq $r0, $r3, .L_call_main /* Branch if no bss. */ unsinged int *ptr = _edata;
sub $r1, $r3, $r0 /* Size to be clear. */ while (ptr != _end)
*ptr++ = 0
/* Set $r2 as how many words to be clear. $r0 = ptr/_edata
Set $r1 as how many bytes are less than a woard to be clear. */ $r1 = _end
srli $r2, $r1, #2 $r2 = 0
andi $r1, $r1, #3 */
beqz $r3, .Lbyte_clear la $r0, _edata
la $r1, _end
la $r4, #0x00000000 beq $r0, $r1, .L_call_main /* Branch if no bss. */
movi $r2, #0
.Lword_clear: .Lword_clear:
swi.bi $r4, [$r0], #4 swi.bi $r2, [$r0], #4
addi $r2, $r2, #-1 bne $r0, $r1, .Lword_clear
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:
.L_call_main: .L_call_main:
/* Call '_init' to invoke constructors. */ /* Call '_init' to invoke constructors. */
@@ -124,6 +118,6 @@ _start:
.L_forever_loop: .L_forever_loop:
/* Should never return here. */ /* Should never return here. */
b .L_forever_loop b .L_forever_loop
.size _start, .-_start .size _start, .-_start