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2008-07-21 Till Straumann <strauman@slac.stanford.edu>

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* startup/linkcmds: fixed sdata/sbss areas -- these
	must be contiguous for SVR4 complicant access via R13.
	Use kludged layout so that sbss, bss, sbss2 are all
	contiguous and zeroed by dlentry.S.

	Provide _SDA_BASE_ and _SDA2_BASE_ for loading R13 (and
	R2 if anyone wants to use EABI).

	Make sure interrupt stack is never in heap area by
	moving it below '_end'.

	Provide symbols for start + end of interrupt stack.
This commit is contained in:
Till Straumann
2008-07-22 05:44:58 +00:00
parent c607d50e70
commit 54b617a0ab
2 changed files with 69 additions and 52 deletions
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15
c/src/lib/libbsp/powerpc/virtex/ChangeLog
View File

@@ -1,3 +1,18 @@
2008-07-21 Till Straumann <strauman@slac.stanford.edu>
* startup/linkcmds: fixed sdata/sbss areas -- these
must be contiguous for SVR4 complicant access via R13.
Use kludged layout so that sbss, bss, sbss2 are all
contiguous and zeroed by dlentry.S.
Provide _SDA_BASE_ and _SDA2_BASE_ for loading R13 (and
R2 if anyone wants to use EABI).
Make sure interrupt stack is never in heap area by
moving it below '_end'.
Provide symbols for start + end of interrupt stack.
2008-07-21 Till Straumann <strauman@slac.stanford.edu>
* console/consolelite.c: use base address from RTEMS_XPARAMETERS_H

106
c/src/lib/libbsp/powerpc/virtex/startup/linkcmds
View File

@@ -179,14 +179,7 @@ SECTIONS
*(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*)
} >RAM
PROVIDE (__SDATA2_START__ = .);
.sdata2 : { *(.sdata2) *(.gnu.linkonce.s2.*) } >RAM
.sbss2 : { *(.sbss2) *(.gnu.linkonce.sb2.*) } >RAM
PROVIDE (__SBSS2_END__ = .);
.sbss2 : { *(.sbss2) } >RAM
PROVIDE (__SBSS2_END__ = .);
/* R/W Data */
.data ( . ) :
{
@@ -197,33 +190,63 @@ SECTIONS
*(.data)
*(.data1)
*(.data.* .gnu.linkonce.d.*)
PROVIDE (__SDATA_START__ = .);
*(.sdata*)
*(.gnu.linkonce.s.*)
data.end = .;
data.size = data.end - data.start;
PROVIDE (_edata = .);
} >RAM
__SBSS_START__ = .;
.bss :
{
bss.start = .;
*(.bss .bss* .gnu.linkonce.b*)
*(.sbss*) *(COMMON)
bss.end = ALIGN(4);
/* Arrange as follows:
* sdata
* sbss
* bss
* sbss2
* sdata2
* so that we have a contiguous 'bss' area
* which can be zeroed in one sweep.
* (sdata/sbss and sdata2/sbss2 must also be
* contiguous).
*/
_SDA_BASE_ = __SDATA_START__ + 0x8000;
.sdata : {
*(.sdata .sdata.*)
*(.gnu.linkonce.s.*)
} > RAM
_edata = .;
.sbss : {
*(.dynsbss)
*(.sbss .sbss.* .gnu.linkonce.sb.*)
*(.scommon)
} > RAM
.bss : {
*(.dynbss)
*(.bss .bss* .gnu.linkonce.b*)
*(COMMON)
} >RAM
bss.size = bss.end - bss.start;
__SBSS_END__ = .;
PROVIDE(_bss_start = ADDR(.bss));
PROVIDE(_bss_size = SIZEOF(.bss));
PROVIDE(bss.size = SIZEOF(.bss));
PROVIDE(_data_start = ADDR(.data));
PROVIDE(_data_size = SIZEOF(.data));
PROVIDE(_text_start = ADDR(.text));
PROVIDE(_text_size = SIZEOF(.text));
PROVIDE(_end = bss.end);
_SDA2_BASE_ = __SBSS2_START__ + 0x8000;
.sbss2 : {
*(.sbss2 .sbss2.* .gnu.linkonce.sb2.*)
} > RAM
.sdata2 : {
*(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
} > RAM
PROVIDE(bss.start = __SBSS_START__);
PROVIDE(bss.size = __SBSS2_END__ - __SBSS_START__);
/* align bottom of 32k init stack at a 32k boundary */
. = . + 0x4000;
. = ALIGN( 0x8000 );
stack.start = .;
. = . + 0x8000;
stack.end = .;
/*
* Interrupt stack setup
*/
IntrStack_start = ALIGN(0x10);
. += 0x4000;
IntrStack_end = .;
PROVIDE(_end = . );
.gzipmalloc : {
@@ -232,14 +255,6 @@ SECTIONS
} >RAM
/*
* Interrupt stack setup
*/
IntrStack_start = ALIGN(0x10);
. += 0x4000;
intrStack = .;
PROVIDE(intrStackPtr = intrStack);
/* Sections for compressed .text and .data */
/* after the .datarom section is an int specifying */
/* the length of the following compressed image */
@@ -258,20 +273,7 @@ SECTIONS
} >RAM
dr_len = _dr_end - _dr_start;
/* align bottom of 32k init stack at a 32k boundary */
. = . + 0x4000;
. = ALIGN( 0x8000 );
stack.start = .;
. = . + 0x8000;
stack.end = .;
/*
* Interrupt stack setup
*/
IntrStack_start = ALIGN(0x10);
. += 0x4000;
intrStack = .;
PROVIDE(intrStackPtr = intrStack);
.line 0 : { *(.line) }
.debug 0 : { *(.debug) }
.debug_sfnames 0 : { *(.debug_sfnames) }