When compressed image is loaded, it must be decompressed to an aligned address + 2 to avoid unaligned access exception on some ARM platforms.
Signed-off-by: Piotr Wilczek p.wilczek@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com CC: Anatolij Gustschin agust@denx.de CC: Wolfgang Denk wd@denx.de --- Changes for V3: - add comment on why extra space is allocated for for uncompressed bmp header - change the + 2 aligment method as Wolfgang Denk suggested
Changes for V2: - add additional space for uncompressed bmp header due to alignment requirements - fix to 32-bit-aligned-address + 2 alignent
common/cmd_bmp.c | 43 +++++++++++++++++++++++++++++-------------- include/lcd.h | 3 ++- 2 files changed, 31 insertions(+), 15 deletions(-)
diff --git a/common/cmd_bmp.c b/common/cmd_bmp.c index 5a52edd..1c1e2a9 100644 --- a/common/cmd_bmp.c +++ b/common/cmd_bmp.c @@ -38,14 +38,19 @@ static int bmp_info (ulong addr); /* * Allocate and decompress a BMP image using gunzip(). * - * Returns a pointer to the decompressed image data. Must be freed by - * the caller after use. + * Returns a pointer to the decompressed image data. This pointer is + * is aligned to 32-bit-aligned-address + 2. + * See doc/README.displaying-bmps for explanation. + * + * The allocation address is passed to 'alloc_addr' and must be freed + * by the caller after use. * * Returns NULL if decompression failed, or if the decompressed data * didn't contain a valid BMP signature. */ #ifdef CONFIG_VIDEO_BMP_GZIP -bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp) +bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp, + void **alloc_addr) { void *dst; unsigned long len; @@ -55,12 +60,20 @@ bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp) * Decompress bmp image */ len = CONFIG_SYS_VIDEO_LOGO_MAX_SIZE; - dst = malloc(CONFIG_SYS_VIDEO_LOGO_MAX_SIZE); + /* allocate extra 3 bytes for 32-bit-aligned-address + 2 alignment */ + dst = malloc(CONFIG_SYS_VIDEO_LOGO_MAX_SIZE + 3); if (dst == NULL) { puts("Error: malloc in gunzip failed!\n"); return NULL; } - if (gunzip(dst, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE, (uchar *)addr, &len) != 0) { + + bmp = dst; + + /* align to 32-bit-aligned-address + 2 */ + if ((unsigned int)bmp % 4 != 2) + bmp = (bmp_image_t *)((((unsigned int)dst + 1) & ~3) + 2); + + if (gunzip(bmp, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE, (uchar *)addr, &len) != 0) { free(dst); return NULL; } @@ -68,8 +81,6 @@ bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp) puts("Image could be truncated" " (increase CONFIG_SYS_VIDEO_LOGO_MAX_SIZE)!\n");
- bmp = dst; - /* * Check for bmp mark 'BM' */ @@ -81,10 +92,12 @@ bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp)
debug("Gzipped BMP image detected!\n");
+ *alloc_addr = dst; return bmp; } #else -bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp) +bmp_image_t *gunzip_bmp(unsigned long addr, unsigned long *lenp, + void **alloc_addr) { return NULL; } @@ -189,11 +202,12 @@ U_BOOT_CMD( static int bmp_info(ulong addr) { bmp_image_t *bmp=(bmp_image_t *)addr; + void *bmp_alloc_addr = NULL; unsigned long len;
if (!((bmp->header.signature[0]=='B') && (bmp->header.signature[1]=='M'))) - bmp = gunzip_bmp(addr, &len); + bmp = gunzip_bmp(addr, &len, &bmp_alloc_addr);
if (bmp == NULL) { printf("There is no valid bmp file at the given address\n"); @@ -205,8 +219,8 @@ static int bmp_info(ulong addr) printf("Bits per pixel: %d\n", le16_to_cpu(bmp->header.bit_count)); printf("Compression : %d\n", le32_to_cpu(bmp->header.compression));
- if ((unsigned long)bmp != addr) - free(bmp); + if (bmp_alloc_addr) + free(bmp_alloc_addr);
return(0); } @@ -225,11 +239,12 @@ int bmp_display(ulong addr, int x, int y) { int ret; bmp_image_t *bmp = (bmp_image_t *)addr; + void *bmp_alloc_addr = NULL; unsigned long len;
if (!((bmp->header.signature[0]=='B') && (bmp->header.signature[1]=='M'))) - bmp = gunzip_bmp(addr, &len); + bmp = gunzip_bmp(addr, &len, &bmp_alloc_addr);
if (!bmp) { printf("There is no valid bmp file at the given address\n"); @@ -244,8 +259,8 @@ int bmp_display(ulong addr, int x, int y) # error bmp_display() requires CONFIG_LCD or CONFIG_VIDEO #endif
- if ((unsigned long)bmp != addr) - free(bmp); + if (bmp_alloc_addr) + free(bmp_alloc_addr);
return ret; } diff --git a/include/lcd.h b/include/lcd.h index c6e7fc5..482e606 100644 --- a/include/lcd.h +++ b/include/lcd.h @@ -46,7 +46,8 @@ void lcd_initcolregs(void); int lcd_getfgcolor(void);
/* gunzip_bmp used if CONFIG_VIDEO_BMP_GZIP */ -struct bmp_image *gunzip_bmp(unsigned long addr, unsigned long *lenp); +struct bmp_image *gunzip_bmp(unsigned long addr, unsigned long *lenp, + void **alloc_addr); int bmp_display(ulong addr, int x, int y);
/**