Marc Jones (marcj303@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/705
-gerrit
commit 37a6cacf4e04d0ee9e75f1b1c7ea307d750623c6 Author: Marc Jones marc.jones@se-eng.com Date: Thu Mar 1 16:12:11 2012 -0700
Make libpaylod alloc() memory pointers volatile
gcc4.6.2 was optimizing the libpayload alloc() function and failing to reload a pointer after the memory had been manipulated by a pointer in the inlined function setup(). I changes the pointer type to volatile and now pass it to the setup() function. I also cleaned up the declaration so that it isn't cast a bunch times in the function.
Change-Id: I1637bd7bd5d9cf82ac88925cbfe76d319aa3cd82 Signed-off-by: Marc Jones marc.jones@se-eng.com --- payloads/libpayload/libc/malloc.c | 25 +++++++++++-------------- 1 files changed, 11 insertions(+), 14 deletions(-)
diff --git a/payloads/libpayload/libc/malloc.c b/payloads/libpayload/libc/malloc.c index 6389fc9..9412cab 100644 --- a/payloads/libpayload/libc/malloc.c +++ b/payloads/libpayload/libc/malloc.c @@ -73,11 +73,9 @@ static int heap_initialized = 0; static int minimal_free = 0; #endif
-static void setup(void) +static void setup(hdrtype_t volatile *start, int size) { - int size = (unsigned int)(&_eheap - &_heap) - HDRSIZE; - - *((hdrtype_t *) hstart) = FREE_BLOCK(size); + *start = FREE_BLOCK(size);
#ifdef CONFIG_DEBUG_MALLOC heap_initialized = 1; @@ -88,7 +86,7 @@ static void setup(void) static void *alloc(int len) { hdrtype_t header; - void *ptr = hstart; + hdrtype_t volatile *ptr = (hdrtype_t volatile *) hstart;
/* Align the size. */ len = (len + 3) & ~3; @@ -97,12 +95,12 @@ static void *alloc(int len) return (void *)NULL;
/* Make sure the region is setup correctly. */ - if (!HAS_MAGIC(*((hdrtype_t *) ptr))) - setup(); + if (!HAS_MAGIC(*ptr)) + setup(ptr, len);
/* Find some free space. */ do { - header = *((hdrtype_t *) ptr); + header = *ptr; int size = SIZE(header);
if (!HAS_MAGIC(header) || size == 0) { @@ -114,7 +112,7 @@ static void *alloc(int len)
if (header & FLAG_FREE) { if (len <= size) { - void *nptr = ptr + (HDRSIZE + len); + hdrtype_t volatile *nptr = ptr + (HDRSIZE + len); int nsize = size - (HDRSIZE + len);
/* If there is still room in this block, @@ -124,14 +122,13 @@ static void *alloc(int len)
if (nsize > 0) { /* Mark the block as used. */ - *((hdrtype_t *) ptr) = USED_BLOCK(len); + *ptr = USED_BLOCK(len);
/* Create a new free block. */ - *((hdrtype_t *) nptr) = - FREE_BLOCK(nsize); + *nptr = FREE_BLOCK(nsize); } else { /* Mark the block as used. */ - *((hdrtype_t *) ptr) = USED_BLOCK(size); + *ptr = USED_BLOCK(size); }
return (void *)(ptr + HDRSIZE); @@ -140,7 +137,7 @@ static void *alloc(int len)
ptr += HDRSIZE + size;
- } while (ptr < hend); + } while (ptr < (hdrtype_t *) hend);
/* Nothing available. */ return (void *)NULL;