loader: Add data swap option to load-elf

Some CPUs are of an opposite data-endianness to other components in the
system. Sometimes elfs have the data sections layed out with this CPU
data-endianness accounting for when loaded via the CPU, so byte swaps
(relative to other system components) will occur.

The leading example, is ARM's BE32 mode, which is is basically LE with
address manipulation on half-word and byte accesses to access the
hw/byte reversed address. This means that word data is invariant
across LE and BE32. This also means that instructions are still LE.
The expectation is that the elf will be loaded via the CPU in this
endianness scheme, which means the data in the elf is reversed at
compile time.

As QEMU loads via the system memory directly, rather than the CPU, we
need a mechanism to reverse elf data endianness to implement this
possibility.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

34 files changed, 81 insertions, 46 deletions

diff --git a/hw/alpha/dp264.c b/hw/alpha/dp264.c
index 992d1b234d..7c5989bdc7 100644
--- a/hw/alpha/dp264.c
+++ b/hw/alpha/dp264.c
@@ -111,7 +111,7 @@ static void clipper_init(MachineState *machine)
     }
     size = load_elf(palcode_filename, cpu_alpha_superpage_to_phys,
                     NULL, &palcode_entry, &palcode_low, &palcode_high,
-                    0, EM_ALPHA, 0);
+                    0, EM_ALPHA, 0, 0);
     if (size < 0) {
         error_report("could not load palcode '%s'", palcode_filename);
         exit(1);
@@ -131,7 +131,7 @@ static void clipper_init(MachineState *machine)
 
         size = load_elf(kernel_filename, cpu_alpha_superpage_to_phys,
                         NULL, &kernel_entry, &kernel_low, &kernel_high,
-                        0, EM_ALPHA, 0);
+                        0, EM_ALPHA, 0, 0);
         if (size < 0) {
             error_report("could not load kernel '%s'", kernel_filename);
             exit(1);
diff --git a/hw/arm/armv7m.c b/hw/arm/armv7m.c
index f3973f721a..ed7d97fc21 100644
--- a/hw/arm/armv7m.c
+++ b/hw/arm/armv7m.c
@@ -211,7 +211,7 @@ DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
 
     if (kernel_filename) {
         image_size = load_elf(kernel_filename, NULL, NULL, &entry, &lowaddr,
-                              NULL, big_endian, EM_ARM, 1);
+                              NULL, big_endian, EM_ARM, 1, 0);
         if (image_size < 0) {
             image_size = load_image_targphys(kernel_filename, 0, mem_size);
             lowaddr = 0;
diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 0a56d34cfe..17400beb58 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -755,7 +755,7 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
     /* Assume that raw images are linux kernels, and ELF images are not.  */
     kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry,
                            &elf_low_addr, &elf_high_addr, big_endian,
-                           elf_machine, 1);
+                           elf_machine, 1, 0);
     if (kernel_size > 0 && have_dtb(info)) {
         /* If there is still some room left at the base of RAM, try and put
          * the DTB there like we do for images loaded with -bios or -pflash.
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 125aa05de6..8e8031ca3c 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -412,7 +412,8 @@ fail:
 /* return < 0 if error, otherwise the number of bytes loaded in memory */
 int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
              void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
-             uint64_t *highaddr, int big_endian, int elf_machine, int clear_lsb)
+             uint64_t *highaddr, int big_endian, int elf_machine,
+             int clear_lsb, int data_swab)
 {
     int fd, data_order, target_data_order, must_swab, ret = ELF_LOAD_FAILED;
     uint8_t e_ident[EI_NIDENT];
@@ -451,10 +452,12 @@ int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
     lseek(fd, 0, SEEK_SET);
     if (e_ident[EI_CLASS] == ELFCLASS64) {
         ret = load_elf64(filename, fd, translate_fn, translate_opaque, must_swab,
-                         pentry, lowaddr, highaddr, elf_machine, clear_lsb);
+                         pentry, lowaddr, highaddr, elf_machine, clear_lsb,
+                         data_swab);
     } else {
         ret = load_elf32(filename, fd, translate_fn, translate_opaque, must_swab,
-                         pentry, lowaddr, highaddr, elf_machine, clear_lsb);
+                         pentry, lowaddr, highaddr, elf_machine, clear_lsb,
+                         data_swab);
     }
 
  fail:
diff --git a/hw/cris/boot.c b/hw/cris/boot.c
index 6608160e0d..42485a4ca0 100644
--- a/hw/cris/boot.c
+++ b/hw/cris/boot.c
@@ -73,7 +73,7 @@ void cris_load_image(CRISCPU *cpu, struct cris_load_info *li)
     /* Boots a kernel elf binary, os/linux-2.6/vmlinux from the axis 
        devboard SDK.  */
     image_size = load_elf(li->image_filename, translate_kernel_address, NULL,
-                          &entry, NULL, &high, 0, EM_CRIS, 0);
+                          &entry, NULL, &high, 0, EM_CRIS, 0, 0);
     li->entry = entry;
     if (image_size < 0) {
         /* Takes a kimage from the axis devboard SDK.  */
diff --git a/hw/i386/multiboot.c b/hw/i386/multiboot.c
index c4d7d8328f..9e164e65d9 100644
--- a/hw/i386/multiboot.c
+++ b/hw/i386/multiboot.c
@@ -196,7 +196,8 @@ int load_multiboot(FWCfgState *fw_cfg,
         }
 
         kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
-                               &elf_low, &elf_high, 0, I386_ELF_MACHINE, 0);
+                               &elf_low, &elf_high, 0, I386_ELF_MACHINE,
+                               0, 0);
         if (kernel_size < 0) {
             fprintf(stderr, "Error while loading elf kernel\n");
             exit(1);
diff --git a/hw/lm32/lm32_boards.c b/hw/lm32/lm32_boards.c
index efa6f91fd2..c5a848b06c 100644
--- a/hw/lm32/lm32_boards.c
+++ b/hw/lm32/lm32_boards.c
@@ -143,7 +143,7 @@ static void lm32_evr_init(MachineState *machine)
         int kernel_size;
 
         kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
-                               1, EM_LATTICEMICO32, 0);
+                               1, EM_LATTICEMICO32, 0, 0);
         reset_info->bootstrap_pc = entry;
 
         if (kernel_size < 0) {
@@ -245,7 +245,7 @@ static void lm32_uclinux_init(MachineState *machine)
         int kernel_size;
 
         kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
-                               1, EM_LATTICEMICO32, 0);
+                               1, EM_LATTICEMICO32, 0, 0);
         reset_info->bootstrap_pc = entry;
 
         if (kernel_size < 0) {
diff --git a/hw/lm32/milkymist.c b/hw/lm32/milkymist.c
index 5a37b4a1c1..f71492ef7e 100644
--- a/hw/lm32/milkymist.c
+++ b/hw/lm32/milkymist.c
@@ -177,7 +177,7 @@ milkymist_init(MachineState *machine)
 
         /* Boots a kernel elf binary.  */
         kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
-                               1, EM_LATTICEMICO32, 0);
+                               1, EM_LATTICEMICO32, 0, 0);
         reset_info->bootstrap_pc = entry;
 
         if (kernel_size < 0) {
diff --git a/hw/m68k/an5206.c b/hw/m68k/an5206.c
index d87b945f05..85f72770d7 100644
--- a/hw/m68k/an5206.c
+++ b/hw/m68k/an5206.c
@@ -73,7 +73,7 @@ static void an5206_init(MachineState *machine)
     }
 
     kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
-                           NULL, NULL, 1, EM_68K, 0);
+                           NULL, NULL, 1, EM_68K, 0, 0);
     entry = elf_entry;
     if (kernel_size < 0) {
         kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
diff --git a/hw/m68k/dummy_m68k.c b/hw/m68k/dummy_m68k.c
index a213bcf307..3c2174b505 100644
--- a/hw/m68k/dummy_m68k.c
+++ b/hw/m68k/dummy_m68k.c
@@ -50,7 +50,7 @@ static void dummy_m68k_init(MachineState *machine)
     /* Load kernel.  */
     if (kernel_filename) {
         kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
-                               NULL, NULL, 1, EM_68K, 0);
+                               NULL, NULL, 1, EM_68K, 0, 0);
         entry = elf_entry;
         if (kernel_size < 0) {
             kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
diff --git a/hw/m68k/mcf5208.c b/hw/m68k/mcf5208.c
index 9597e861ab..4f49d34a8f 100644
--- a/hw/m68k/mcf5208.c
+++ b/hw/m68k/mcf5208.c
@@ -276,7 +276,7 @@ static void mcf5208evb_init(MachineState *machine)
     }
 
     kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
-                           NULL, NULL, 1, EM_68K, 0);
+                           NULL, NULL, 1, EM_68K, 0, 0);
     entry = elf_entry;
     if (kernel_size < 0) {
         kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
diff --git a/hw/microblaze/boot.c b/hw/microblaze/boot.c
index 26cc3786f4..c24014a1f3 100644
--- a/hw/microblaze/boot.c
+++ b/hw/microblaze/boot.c
@@ -142,12 +142,12 @@ void microblaze_load_kernel(MicroBlazeCPU *cpu, hwaddr ddr_base,
         /* Boots a kernel elf binary.  */
         kernel_size = load_elf(kernel_filename, NULL, NULL,
                                &entry, &low, &high,
-                               big_endian, EM_MICROBLAZE, 0);
+                               big_endian, EM_MICROBLAZE, 0, 0);
         base32 = entry;
         if (base32 == 0xc0000000) {
             kernel_size = load_elf(kernel_filename, translate_kernel_address,
                                    NULL, &entry, NULL, NULL,
-                                   big_endian, EM_MICROBLAZE, 0);
+                                   big_endian, EM_MICROBLAZE, 0, 0);
         }
         /* Always boot into physical ram.  */
         boot_info.bootstrap_pc = (uint32_t)entry;
diff --git a/hw/mips/mips_fulong2e.c b/hw/mips/mips_fulong2e.c
index 184c404454..4e5581b167 100644
--- a/hw/mips/mips_fulong2e.c
+++ b/hw/mips/mips_fulong2e.c
@@ -117,7 +117,7 @@ static int64_t load_kernel (CPUMIPSState *env)
 
     if (load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys, NULL,
                  (uint64_t *)&kernel_entry, (uint64_t *)&kernel_low,
-                 (uint64_t *)&kernel_high, 0, EM_MIPS, 1) < 0) {
+                 (uint64_t *)&kernel_high, 0, EM_MIPS, 1, 0) < 0) {
         fprintf(stderr, "qemu: could not load kernel '%s'\n",
                 loaderparams.kernel_filename);
         exit(1);
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index c04aa2b8cc..f5173c42de 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -796,7 +796,7 @@ static int64_t load_kernel (void)
 
     if (load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys, NULL,
                  (uint64_t *)&kernel_entry, NULL, (uint64_t *)&kernel_high,
-                 big_endian, EM_MIPS, 1) < 0) {
+                 big_endian, EM_MIPS, 1, 0) < 0) {
         fprintf(stderr, "qemu: could not load kernel '%s'\n",
                 loaderparams.kernel_filename);
         exit(1);
diff --git a/hw/mips/mips_mipssim.c b/hw/mips/mips_mipssim.c
index 8951ae97d3..1ecff44a54 100644
--- a/hw/mips/mips_mipssim.c
+++ b/hw/mips/mips_mipssim.c
@@ -70,7 +70,7 @@ static int64_t load_kernel(void)
     kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
                            NULL, (uint64_t *)&entry, NULL,
                            (uint64_t *)&kernel_high, big_endian,
-                           EM_MIPS, 1);
+                           EM_MIPS, 1, 0);
     if (kernel_size >= 0) {
         if ((entry & ~0x7fffffffULL) == 0x80000000)
             entry = (int32_t)entry;
diff --git a/hw/mips/mips_r4k.c b/hw/mips/mips_r4k.c
index b6625aeee4..724b1e9d51 100644
--- a/hw/mips/mips_r4k.c
+++ b/hw/mips/mips_r4k.c
@@ -88,7 +88,7 @@ static int64_t load_kernel(void)
     kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
                            NULL, (uint64_t *)&entry, NULL,
                            (uint64_t *)&kernel_high, big_endian,
-                           EM_MIPS, 1);
+                           EM_MIPS, 1, 0);
     if (kernel_size >= 0) {
         if ((entry & ~0x7fffffffULL) == 0x80000000)
             entry = (int32_t)entry;
diff --git a/hw/moxie/moxiesim.c b/hw/moxie/moxiesim.c
index 9191ae9603..d88c9428e0 100644
--- a/hw/moxie/moxiesim.c
+++ b/hw/moxie/moxiesim.c
@@ -54,7 +54,8 @@ static void load_kernel(MoxieCPU *cpu, LoaderParams *loader_params)
     ram_addr_t initrd_offset;
 
     kernel_size = load_elf(loader_params->kernel_filename,  NULL, NULL,
-                           &entry, &kernel_low, &kernel_high, 1, EM_MOXIE, 0);
+                           &entry, &kernel_low, &kernel_high, 1, EM_MOXIE,
+                           0, 0);
 
     if (kernel_size <= 0) {
         fprintf(stderr, "qemu: could not load kernel '%s'\n",
diff --git a/hw/openrisc/openrisc_sim.c b/hw/openrisc/openrisc_sim.c
index 25c637aba7..46418c30f7 100644
--- a/hw/openrisc/openrisc_sim.c
+++ b/hw/openrisc/openrisc_sim.c
@@ -69,7 +69,8 @@ static void cpu_openrisc_load_kernel(ram_addr_t ram_size,
 
     if (kernel_filename && !qtest_enabled()) {
         kernel_size = load_elf(kernel_filename, NULL, NULL,
-                               &elf_entry, NULL, NULL, 1, EM_OPENRISC, 1);
+                               &elf_entry, NULL, NULL, 1, EM_OPENRISC,
+                               1, 0);
         entry = elf_entry;
         if (kernel_size < 0) {
             kernel_size = load_uimage(kernel_filename,
diff --git a/hw/pci-host/prep.c b/hw/pci-host/prep.c
index 5dc550fe5e..49cdaab36b 100644
--- a/hw/pci-host/prep.c
+++ b/hw/pci-host/prep.c
@@ -313,7 +313,7 @@ static void raven_realize(PCIDevice *d, Error **errp)
         if (filename) {
             if (s->elf_machine != EM_NONE) {
                 bios_size = load_elf(filename, NULL, NULL, NULL,
-                                     NULL, NULL, 1, s->elf_machine, 0);
+                                     NULL, NULL, 1, s->elf_machine, 0, 0);
             }
             if (bios_size < 0) {
                 bios_size = get_image_size(filename);
diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
index bd84e9ac13..09154fa813 100644
--- a/hw/ppc/e500.c
+++ b/hw/ppc/e500.c
@@ -1017,7 +1017,7 @@ void ppce500_init(MachineState *machine, PPCE500Params *params)
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 
     bios_size = load_elf(filename, NULL, NULL, &bios_entry, &loadaddr, NULL,
-                         1, PPC_ELF_MACHINE, 0);
+                         1, PPC_ELF_MACHINE, 0, 0);
     if (bios_size < 0) {
         /*
          * Hrm. No ELF image? Try a uImage, maybe someone is giving us an
diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
index f95086b787..f0a36b3133 100644
--- a/hw/ppc/mac_newworld.c
+++ b/hw/ppc/mac_newworld.c
@@ -221,7 +221,7 @@ static void ppc_core99_init(MachineState *machine)
     /* Load OpenBIOS (ELF) */
     if (filename) {
         bios_size = load_elf(filename, NULL, NULL, NULL,
-                             NULL, NULL, 1, PPC_ELF_MACHINE, 0);
+                             NULL, NULL, 1, PPC_ELF_MACHINE, 0, 0);
 
         g_free(filename);
     } else {
@@ -244,7 +244,8 @@ static void ppc_core99_init(MachineState *machine)
         kernel_base = KERNEL_LOAD_ADDR;
 
         kernel_size = load_elf(kernel_filename, translate_kernel_address, NULL,
-                               NULL, &lowaddr, NULL, 1, PPC_ELF_MACHINE, 0);
+                               NULL, &lowaddr, NULL, 1, PPC_ELF_MACHINE,
+                               0, 0);
         if (kernel_size < 0)
             kernel_size = load_aout(kernel_filename, kernel_base,
                                     ram_size - kernel_base, bswap_needed,
diff --git a/hw/ppc/mac_oldworld.c b/hw/ppc/mac_oldworld.c
index 898439860c..d952713313 100644
--- a/hw/ppc/mac_oldworld.c
+++ b/hw/ppc/mac_oldworld.c
@@ -149,7 +149,7 @@ static void ppc_heathrow_init(MachineState *machine)
     /* Load OpenBIOS (ELF) */
     if (filename) {
         bios_size = load_elf(filename, 0, NULL, NULL, NULL, NULL,
-                             1, PPC_ELF_MACHINE, 0);
+                             1, PPC_ELF_MACHINE, 0, 0);
         g_free(filename);
     } else {
         bios_size = -1;
@@ -170,7 +170,8 @@ static void ppc_heathrow_init(MachineState *machine)
 #endif
         kernel_base = KERNEL_LOAD_ADDR;
         kernel_size = load_elf(kernel_filename, translate_kernel_address, NULL,
-                               NULL, &lowaddr, NULL, 1, PPC_ELF_MACHINE, 0);
+                               NULL, &lowaddr, NULL, 1, PPC_ELF_MACHINE,
+                               0, 0);
         if (kernel_size < 0)
             kernel_size = load_aout(kernel_filename, kernel_base,
                                     ram_size - kernel_base, bswap_needed,
diff --git a/hw/ppc/ppc440_bamboo.c b/hw/ppc/ppc440_bamboo.c
index e535a9f266..5c535b18a2 100644
--- a/hw/ppc/ppc440_bamboo.c
+++ b/hw/ppc/ppc440_bamboo.c
@@ -256,7 +256,8 @@ static void bamboo_init(MachineState *machine)
                               NULL, NULL);
         if (success < 0) {
             success = load_elf(kernel_filename, NULL, NULL, &elf_entry,
-                               &elf_lowaddr, NULL, 1, PPC_ELF_MACHINE, 0);
+                               &elf_lowaddr, NULL, 1, PPC_ELF_MACHINE,
+                               0, 0);
             entry = elf_entry;
             loadaddr = elf_lowaddr;
         }
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index e9d4abf06a..64c4acce06 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1942,11 +1942,13 @@ static void ppc_spapr_init(MachineState *machine)
         uint64_t lowaddr = 0;
 
         kernel_size = load_elf(kernel_filename, translate_kernel_address, NULL,
-                               NULL, &lowaddr, NULL, 1, PPC_ELF_MACHINE, 0);
+                               NULL, &lowaddr, NULL, 1, PPC_ELF_MACHINE,
+                               0, 0);
         if (kernel_size == ELF_LOAD_WRONG_ENDIAN) {
             kernel_size = load_elf(kernel_filename,
                                    translate_kernel_address, NULL,
-                                   NULL, &lowaddr, NULL, 0, PPC_ELF_MACHINE, 0);
+                                   NULL, &lowaddr, NULL, 0, PPC_ELF_MACHINE,
+                                   0, 0);
             kernel_le = kernel_size > 0;
         }
         if (kernel_size < 0) {
diff --git a/hw/ppc/virtex_ml507.c b/hw/ppc/virtex_ml507.c
index a902c88277..b807a08c28 100644
--- a/hw/ppc/virtex_ml507.c
+++ b/hw/ppc/virtex_ml507.c
@@ -258,7 +258,8 @@ static void virtex_init(MachineState *machine)
 
         /* Boots a kernel elf binary.  */
         kernel_size = load_elf(kernel_filename, NULL, NULL,
-                               &entry, &low, &high, 1, PPC_ELF_MACHINE, 0);
+                               &entry, &low, &high, 1, PPC_ELF_MACHINE,
+                               0, 0);
         boot_info.bootstrap_pc = entry & 0x00ffffff;
 
         if (kernel_size < 0) {
diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index c9cf7cce64..41ff002069 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -101,7 +101,7 @@ static void s390_ipl_realize(DeviceState *dev, Error **errp)
 
         bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
                              &ipl->bios_start_addr, NULL, NULL, 1,
-                             EM_S390, 0);
+                             EM_S390, 0, 0);
         if (bios_size > 0) {
             /* Adjust ELF start address to final location */
             ipl->bios_start_addr += fwbase;
@@ -124,7 +124,7 @@ static void s390_ipl_realize(DeviceState *dev, Error **errp)
 
     if (ipl->kernel) {
         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
-                               NULL, 1, EM_S390, 0);
+                               NULL, 1, EM_S390, 0, 0);
         if (kernel_size < 0) {
             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
         }
diff --git a/hw/sparc/leon3.c b/hw/sparc/leon3.c
index 07c5c850ef..c579f5b9ea 100644
--- a/hw/sparc/leon3.c
+++ b/hw/sparc/leon3.c
@@ -194,7 +194,7 @@ static void leon3_generic_hw_init(MachineState *machine)
         uint64_t entry;
 
         kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
-                               1 /* big endian */, EM_SPARC, 0);
+                               1 /* big endian */, EM_SPARC, 0, 0);
         if (kernel_size < 0) {
             fprintf(stderr, "qemu: could not load kernel '%s'\n",
                     kernel_filename);
diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c
index 20dc341710..eebef37897 100644
--- a/hw/sparc/sun4m.c
+++ b/hw/sparc/sun4m.c
@@ -279,7 +279,7 @@ static unsigned long sun4m_load_kernel(const char *kernel_filename,
         bswap_needed = 0;
 #endif
         kernel_size = load_elf(kernel_filename, translate_kernel_address, NULL,
-                               NULL, NULL, NULL, 1, EM_SPARC, 0);
+                               NULL, NULL, NULL, 1, EM_SPARC, 0, 0);
         if (kernel_size < 0)
             kernel_size = load_aout(kernel_filename, KERNEL_LOAD_ADDR,
                                     RAM_size - KERNEL_LOAD_ADDR, bswap_needed,
@@ -723,7 +723,7 @@ static void prom_init(hwaddr addr, const char *bios_name)
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
     if (filename) {
         ret = load_elf(filename, translate_prom_address, &addr, NULL,
-                       NULL, NULL, 1, EM_SPARC, 0);
+                       NULL, NULL, 1, EM_SPARC, 0, 0);
         if (ret < 0 || ret > PROM_SIZE_MAX) {
             ret = load_image_targphys(filename, addr, PROM_SIZE_MAX);
         }
diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index add1e752f3..0a6f453858 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -187,7 +187,7 @@ static uint64_t sun4u_load_kernel(const char *kernel_filename,
         bswap_needed = 0;
 #endif
         kernel_size = load_elf(kernel_filename, NULL, NULL, kernel_entry,
-                               kernel_addr, &kernel_top, 1, EM_SPARCV9, 0);
+                               kernel_addr, &kernel_top, 1, EM_SPARCV9, 0, 0);
         if (kernel_size < 0) {
             *kernel_addr = KERNEL_LOAD_ADDR;
             *kernel_entry = KERNEL_LOAD_ADDR;
@@ -633,7 +633,7 @@ static void prom_init(hwaddr addr, const char *bios_name)
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
     if (filename) {
         ret = load_elf(filename, translate_prom_address, &addr,
-                       NULL, NULL, NULL, 1, EM_SPARCV9, 0);
+                       NULL, NULL, NULL, 1, EM_SPARCV9, 0, 0);
         if (ret < 0 || ret > PROM_SIZE_MAX) {
             ret = load_image_targphys(filename, addr, PROM_SIZE_MAX);
         }
diff --git a/hw/tricore/tricore_testboard.c b/hw/tricore/tricore_testboard.c
index 9392571f1f..3cadb6521c 100644
--- a/hw/tricore/tricore_testboard.c
+++ b/hw/tricore/tricore_testboard.c
@@ -45,7 +45,7 @@ static void tricore_load_kernel(CPUTriCoreState *env)
     kernel_size = load_elf(tricoretb_binfo.kernel_filename, NULL,
                            NULL, (uint64_t *)&entry, NULL,
                            NULL, 0,
-                           EM_TRICORE, 1);
+                           EM_TRICORE, 1, 0);
     if (kernel_size <= 0) {
         error_report("qemu: no kernel file '%s'",
                 tricoretb_binfo.kernel_filename);
diff --git a/hw/xtensa/sim.c b/hw/xtensa/sim.c
index 3a5060b03b..23050e8fb7 100644
--- a/hw/xtensa/sim.c
+++ b/hw/xtensa/sim.c
@@ -94,10 +94,10 @@ static void xtensa_sim_init(MachineState *machine)
         uint64_t elf_lowaddr;
 #ifdef TARGET_WORDS_BIGENDIAN
         int success = load_elf(kernel_filename, translate_phys_addr, cpu,
-                &elf_entry, &elf_lowaddr, NULL, 1, EM_XTENSA, 0);
+                &elf_entry, &elf_lowaddr, NULL, 1, EM_XTENSA, 0, 0);
 #else
         int success = load_elf(kernel_filename, translate_phys_addr, cpu,
-                &elf_entry, &elf_lowaddr, NULL, 0, EM_XTENSA, 0);
+                &elf_entry, &elf_lowaddr, NULL, 0, EM_XTENSA, 0, 0);
 #endif
         if (success > 0) {
             env->pc = elf_entry;
diff --git a/hw/xtensa/xtfpga.c b/hw/xtensa/xtfpga.c
index fe7684d41c..ed09b9d809 100644
--- a/hw/xtensa/xtfpga.c
+++ b/hw/xtensa/xtfpga.c
@@ -355,7 +355,7 @@ static void lx_init(const LxBoardDesc *board, MachineState *machine)
         uint64_t elf_entry;
         uint64_t elf_lowaddr;
         int success = load_elf(kernel_filename, translate_phys_addr, cpu,
-                &elf_entry, &elf_lowaddr, NULL, be, EM_XTENSA, 0);
+                &elf_entry, &elf_lowaddr, NULL, be, EM_XTENSA, 0, 0);
         if (success > 0) {
             entry_point = elf_entry;
         } else {
diff --git a/include/hw/elf_ops.h b/include/hw/elf_ops.h
index 0010c441d9..f510e7ec2a 100644
--- a/include/hw/elf_ops.h
+++ b/include/hw/elf_ops.h
@@ -263,7 +263,7 @@ static int glue(load_elf, SZ)(const char *name, int fd,
                               void *translate_opaque,
                               int must_swab, uint64_t *pentry,
                               uint64_t *lowaddr, uint64_t *highaddr,
-                              int elf_machine, int clear_lsb)
+                              int elf_machine, int clear_lsb, int data_swab)
 {
     struct elfhdr ehdr;
     struct elf_phdr *phdr = NULL, *ph;
@@ -366,6 +366,26 @@ static int glue(load_elf, SZ)(const char *name, int fd,
                 addr = ph->p_paddr;
             }
 
+            if (data_swab) {
+                int j;
+                for (j = 0; j < file_size; j += (1 << data_swab)) {
+                    uint8_t *dp = data + j;
+                    switch (data_swab) {
+                    case (1):
+                        *(uint16_t *)dp = bswap16(*(uint16_t *)dp);
+                        break;
+                    case (2):
+                        *(uint32_t *)dp = bswap32(*(uint32_t *)dp);
+                        break;
+                    case (3):
+                        *(uint64_t *)dp = bswap64(*(uint64_t *)dp);
+                        break;
+                    default:
+                        g_assert_not_reached();
+                    }
+                }
+            }
+
             /* the entry pointer in the ELF header is a virtual
              * address, if the text segments paddr and vaddr differ
              * we need to adjust the entry */
diff --git a/include/hw/loader.h b/include/hw/loader.h
index 5485906095..0ba780852c 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -56,6 +56,9 @@ const char *load_elf_strerror(int error);
  * @elf_machine: Expected ELF machine type
  * @clear_lsb: Set to mask off LSB of addresses (Some architectures use
  *             this for non-address data)
+ * @data_swab: Set to order of byte swapping for data. 0 for no swap, 1
+ *             for swapping bytes within halfwords, 2 for bytes within
+ *             words and 3 for within doublewords.
  *
  * Load an ELF file's contents to the emulated system's address space.
  * Clients may optionally specify a callback to perform address
@@ -70,7 +73,7 @@ const char *load_elf_strerror(int error);
 int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
              void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
              uint64_t *highaddr, int big_endian, int elf_machine,
-             int clear_lsb);
+             int clear_lsb, int data_swab);
 
 /** load_elf_hdr:
  * @filename: Path of ELF file