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2009-10-28 Till Straumann <strauman@slac.stanford.edu>

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* start/start.S: Make sure initial stack is aligned
	to CPU_STACK_ALIGNMENT before calling C-code.
This commit is contained in:
Till Straumann
2009-10-29 03:22:19 +00:00
parent edfc0f9260
commit 23303c0311
2 changed files with 21 additions and 5 deletions
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7
c/src/lib/libbsp/i386/pc386/ChangeLog
View File

@@ -1,4 +1,9 @@
2009-12-27 Till Straumann <strauman@slac.stanford.edu>
2009-10-28 Till Straumann <strauman@slac.stanford.edu>
* start/start.S: Make sure initial stack is aligned
to CPU_STACK_ALIGNMENT before calling C-code.
2009-10-27 Till Straumann <strauman@slac.stanford.edu>
* include/bsp.h, console/console.c: Provide weak-alias
hook so that the application may choose the console.

19
c/src/lib/libbsp/i386/pc386/start/start.S
View File

@@ -42,11 +42,16 @@
*/
#include <rtems/asm.h>
#include <rtems/score/cpu.h>
/*----------------------------------------------------------------------------+
| Size of heap and stack:
+----------------------------------------------------------------------------*/
#ifndef CPU_STACK_ALIGNMENT
#error "Missing header ? CPU_STACK_ALIGNMENT NOT DEFINED"
#endif
.set STACK_SIZE, 0x1000
/*----------------------------------------------------------------------------+
@@ -164,7 +169,8 @@ SYM (_establish_stack):
movl $_end, eax # eax = end of bss/start of heap
addl $STACK_SIZE, eax # make room for stack
andl $0xffffffc0, eax # align it on 16 byte boundary
subl $4, eax # reserve room for arg to 'boot_card'
andl $ - CPU_STACK_ALIGNMENT, eax # align SP on CPU_STACK_ALIGNMENT boundary
movl eax, esp # set stack pointer
movl eax, ebp # set base pointer
@@ -197,12 +203,17 @@ SYM (zero_bss):
/*---------------------------------------------------------------------+
| Transfer control to User's Board Support Package
| Note: at the top we reserved space for the argument
| so that
| initial_esp = ( TOS - 4 ) & ~(CPU_STACK_ALIGNMENT-1)
| this ensures that
| 1) esp is now aligned
| 2) there is space for the cmdline pointer which we just
| may store at *(esp)
+---------------------------------------------------------------------*/
movl $SYM(_boot_multiboot_cmdline), eax
pushl eax # cmdline
movl $SYM(_boot_multiboot_cmdline), (esp)
call SYM (boot_card)
addl $4, esp
/*---------------------------------------------------------------------+
| Clean up - we do not know anything about it, so we will