From 376827d48922941d16ef9949672e86f820005d0a Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Thu, 21 Nov 2013 15:34:26 +0200 Subject: [PATCH] s390x: fix flat file load on 32 bit systems pc-bios/s390-zipl.rom is a flat image so it's expected that loading it as elf will fail. It should fall back on loading a flat file, but doesn't on 32 bit systems, instead it fails printing: qemu: hardware error: could not load bootloader 's390-zipl.rom' The result is boot failure. The reason is that a 64 bit unsigned interger which is set to -1 on error is compared to -1UL which on a 32 bit system with gcc is a 32 bit unsigned interger. Since both are unsigned, no sign extension takes place and comparison evaluates to non-equal. There's no reason to do clever tricks: all functions we call actually return int so just use int. And then we can use == -1 everywhere, consistently. Reviewed-by: Alexander Graf Signed-off-by: Michael S. Tsirkin Message-id: 20131121133426.GA30827@redhat.com Signed-off-by: Anthony Liguori --- hw/s390x/ipl.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c index d69adb2f5..65d39da31 100644 --- a/hw/s390x/ipl.c +++ b/hw/s390x/ipl.c @@ -62,10 +62,10 @@ typedef struct S390IPLState { static int s390_ipl_init(SysBusDevice *dev) { S390IPLState *ipl = S390_IPL(dev); - ram_addr_t kernel_size = 0; + int kernel_size; if (!ipl->kernel) { - ram_addr_t bios_size = 0; + int bios_size; char *bios_filename; /* Load zipl bootloader */ @@ -80,7 +80,7 @@ static int s390_ipl_init(SysBusDevice *dev) bios_size = load_elf(bios_filename, NULL, NULL, &ipl->start_addr, NULL, NULL, 1, ELF_MACHINE, 0); - if (bios_size == -1UL) { + if (bios_size == -1) { bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START, 4096); ipl->start_addr = ZIPL_IMAGE_START; @@ -90,17 +90,17 @@ static int s390_ipl_init(SysBusDevice *dev) } g_free(bios_filename); - if ((long)bios_size < 0) { + if (bios_size == -1) { hw_error("could not load bootloader '%s'\n", bios_name); } return 0; } else { kernel_size = load_elf(ipl->kernel, NULL, NULL, NULL, NULL, NULL, 1, ELF_MACHINE, 0); - if (kernel_size == -1UL) { + if (kernel_size == -1) { kernel_size = load_image_targphys(ipl->kernel, 0, ram_size); } - if (kernel_size == -1UL) { + if (kernel_size == -1) { fprintf(stderr, "could not load kernel '%s'\n", ipl->kernel); return -1; } @@ -115,7 +115,8 @@ static int s390_ipl_init(SysBusDevice *dev) ipl->start_addr = KERN_IMAGE_START; } if (ipl->initrd) { - ram_addr_t initrd_offset, initrd_size; + ram_addr_t initrd_offset; + int initrd_size; initrd_offset = INITRD_START; while (kernel_size + 0x100000 > initrd_offset) { @@ -123,7 +124,7 @@ static int s390_ipl_init(SysBusDevice *dev) } initrd_size = load_image_targphys(ipl->initrd, initrd_offset, ram_size - initrd_offset); - if (initrd_size == -1UL) { + if (initrd_size == -1) { fprintf(stderr, "qemu: could not load initrd '%s'\n", ipl->initrd); exit(1); } -- 2.39.2