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2011-07-27 Till Straumann <strauman@slac.stanford.edu>

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* shared/start/start.S, shared/start/preload.S:
	Make sure stack is 16-byte aligned and the TOS
	is tagged with a NULL pointer (used as a terminator
	when printing stack traces).
This commit is contained in:
Till Straumann
2011-07-28 01:13:20 +00:00
parent f2dd10b7d1
commit 38ccd6fa1a
3 changed files with 17 additions and 1 deletions
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7
c/src/lib/libbsp/powerpc/ChangeLog
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@@ -1,3 +1,10 @@
2011-07-27 Till Straumann <strauman@slac.stanford.edu>
* shared/start/start.S, shared/start/preload.S:
Make sure stack is 16-byte aligned and the TOS
is tagged with a NULL pointer (used as a terminator
when printing stack traces).
2011-07-26 Till Straumann <strauman@slac.stanford.edu> 2011-07-26 Till Straumann <strauman@slac.stanford.edu>
* shared/irq/openpic_i8259_irq.c: silenced compiler warnings. * shared/irq/openpic_i8259_irq.c: silenced compiler warnings.

5
c/src/lib/libbsp/powerpc/shared/start/preload.S
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@@ -84,7 +84,7 @@
* if DESTINATION_ADDR is not 0 * if DESTINATION_ADDR is not 0
*/ */
#define KERNELBASE 0x0 #define KERNELBASE 0x0
#define INITIAL_STACK 0x78 /* 8-byte aligned */ #define INITIAL_STACK 0x70 /* 16-byte aligned */
#define CACHE_LINE_SIZE PPC_CACHE_ALIGNMENT /* autodetect doesn't work, see below */ #define CACHE_LINE_SIZE PPC_CACHE_ALIGNMENT /* autodetect doesn't work, see below */
#define ASSUME_RTEMS_INSTALLS_VECTORS /* assume we need not load vectors */ #define ASSUME_RTEMS_INSTALLS_VECTORS /* assume we need not load vectors */
#define DONT_USE_R5_ENTRY /* always dynamically determine the address we're running from */ #define DONT_USE_R5_ENTRY /* always dynamically determine the address we're running from */
@@ -211,6 +211,9 @@ return_here:
/* setup initial stack for rtems early boot */ /* setup initial stack for rtems early boot */
li r1,INITIAL_STACK li r1,INITIAL_STACK
/* tag TOS with a NULL pointer (for stack trace) */
li r0, 0
stw r0, 0(r1)
/* disable the MMU and fire up rtems */ /* disable the MMU and fire up rtems */
mfmsr r0 mfmsr r0
ori r0,r0,MSR_IR|MSR_DR|MSR_IP|MSR_ME ori r0,r0,MSR_IR|MSR_DR|MSR_IP|MSR_ME

6
c/src/lib/libbsp/powerpc/shared/start/start.S
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@@ -129,6 +129,12 @@ enter_C_code:
*/ */
li r0, (CPU_STACK_ALIGNMENT-1) li r0, (CPU_STACK_ALIGNMENT-1)
andc r1, r9, r0 andc r1, r9, r0
/*
* Tag TOS with a NULL (terminator for stack dump)
*/
li r0, 0
stw r0, 0(r1)
/* /*
* We are now in a environment that is totally independent from * We are now in a environment that is totally independent from
* bootloader setup. * bootloader setup.