[PATCH] load_aout: replace bswap_needed with big_endian

[Paolo Bonzini <pbonzini@redhat.com>]

Targets know whether they are big-endian more than they know if
the endianness is different from the host: the former is mostly
a constant, at least in machine creation code, while the latter
has to be computed with TARGET_BIG_ENDIAN != HOST_BIG_ENDIAN or
something like that.

load_aout, however, takes a "bswap_needed" argument.  Replace
it with a "big_endian" argument; even though all users are
big-endian, it is cheap enough to keep the optional swapping
functionality even for little-endian boards.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/hw/loader.h   | 2 +-
 hw/core/loader.c      | 4 ++--
 hw/ppc/mac_newworld.c | 7 +------
 hw/ppc/mac_oldworld.c | 7 +------
 hw/sparc/sun4m.c      | 9 +--------
 hw/sparc64/sun4u.c    | 9 +--------
 6 files changed, 7 insertions(+), 31 deletions(-)

diff --git a/include/hw/loader.h b/include/hw/loader.h
index 784a93d6c17..d280dc33e96 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -190,7 +190,7 @@ ssize_t load_elf(const char *filename,
 void load_elf_hdr(const char *filename, void *hdr, bool *is64, Error **errp);
 
 ssize_t load_aout(const char *filename, hwaddr addr, int max_sz,
-                  int bswap_needed, hwaddr target_page_size);
+                  bool big_endian, hwaddr target_page_size);
 
 #define LOAD_UIMAGE_LOADADDR_INVALID (-1)
 
diff --git a/hw/core/loader.c b/hw/core/loader.c
index ce6ff1b52e3..2e35f0aa905 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -226,7 +226,7 @@ static void bswap_ahdr(struct exec *e)
 
 
 ssize_t load_aout(const char *filename, hwaddr addr, int max_sz,
-                  int bswap_needed, hwaddr target_page_size)
+                  bool big_endian, hwaddr target_page_size)
 {
     int fd;
     ssize_t size, ret;
@@ -241,7 +241,7 @@ ssize_t load_aout(const char *filename, hwaddr addr, int max_sz,
     if (size < 0)
         goto fail;
 
-    if (bswap_needed) {
+    if (big_endian != HOST_BIG_ENDIAN) {
         bswap_ahdr(&e);
     }
 
diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
index cb3dc3ab482..2d5309d6f55 100644
--- a/hw/ppc/mac_newworld.c
+++ b/hw/ppc/mac_newworld.c
@@ -197,11 +197,6 @@ static void ppc_core99_init(MachineState *machine)
     }
 
     if (machine->kernel_filename) {
-        int bswap_needed = 0;
-
-#ifdef BSWAP_NEEDED
-        bswap_needed = 1;
-#endif
         kernel_base = KERNEL_LOAD_ADDR;
         kernel_size = load_elf(machine->kernel_filename, NULL,
                                translate_kernel_address, NULL, NULL, NULL,
@@ -209,7 +204,7 @@ static void ppc_core99_init(MachineState *machine)
         if (kernel_size < 0) {
             kernel_size = load_aout(machine->kernel_filename, kernel_base,
                                     machine->ram_size - kernel_base,
-                                    bswap_needed, TARGET_PAGE_SIZE);
+                                    true, TARGET_PAGE_SIZE);
         }
         if (kernel_size < 0) {
             kernel_size = load_image_targphys(machine->kernel_filename,
diff --git a/hw/ppc/mac_oldworld.c b/hw/ppc/mac_oldworld.c
index 0dbcea035c3..b5814690f5a 100644
--- a/hw/ppc/mac_oldworld.c
+++ b/hw/ppc/mac_oldworld.c
@@ -153,11 +153,6 @@ static void ppc_heathrow_init(MachineState *machine)
     }
 
     if (machine->kernel_filename) {
-        int bswap_needed = 0;
-
-#ifdef BSWAP_NEEDED
-        bswap_needed = 1;
-#endif
         kernel_base = KERNEL_LOAD_ADDR;
         kernel_size = load_elf(machine->kernel_filename, NULL,
                                translate_kernel_address, NULL, NULL, NULL,
@@ -165,7 +160,7 @@ static void ppc_heathrow_init(MachineState *machine)
         if (kernel_size < 0) {
             kernel_size = load_aout(machine->kernel_filename, kernel_base,
                                     machine->ram_size - kernel_base,
-                                    bswap_needed, TARGET_PAGE_SIZE);
+                                    true, TARGET_PAGE_SIZE);
         }
         if (kernel_size < 0) {
             kernel_size = load_image_targphys(machine->kernel_filename,
diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c
index a48d3622c5a..5aaafb40dac 100644
--- a/hw/sparc/sun4m.c
+++ b/hw/sparc/sun4m.c
@@ -233,20 +233,13 @@ static unsigned long sun4m_load_kernel(const char *kernel_filename,
 
     kernel_size = 0;
     if (linux_boot) {
-        int bswap_needed;
-
-#ifdef BSWAP_NEEDED
-        bswap_needed = 1;
-#else
-        bswap_needed = 0;
-#endif
         kernel_size = load_elf(kernel_filename, NULL,
                                translate_kernel_address, NULL,
                                NULL, NULL, NULL, NULL,
                                ELFDATA2MSB, EM_SPARC, 0, 0);
         if (kernel_size < 0)
             kernel_size = load_aout(kernel_filename, KERNEL_LOAD_ADDR,
-                                    RAM_size - KERNEL_LOAD_ADDR, bswap_needed,
+                                    RAM_size - KERNEL_LOAD_ADDR, true,
                                     TARGET_PAGE_SIZE);
         if (kernel_size < 0)
             kernel_size = load_image_targphys(kernel_filename,
diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index 8ab5cf0461f..d3cb7270ff5 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -168,13 +168,6 @@ static uint64_t sun4u_load_kernel(const char *kernel_filename,
 
     kernel_size = 0;
     if (linux_boot) {
-        int bswap_needed;
-
-#ifdef BSWAP_NEEDED
-        bswap_needed = 1;
-#else
-        bswap_needed = 0;
-#endif
         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, kernel_entry,
                                kernel_addr, &kernel_top, NULL,
                                ELFDATA2MSB, EM_SPARCV9, 0, 0);
@@ -182,7 +175,7 @@ static uint64_t sun4u_load_kernel(const char *kernel_filename,
             *kernel_addr = KERNEL_LOAD_ADDR;
             *kernel_entry = KERNEL_LOAD_ADDR;
             kernel_size = load_aout(kernel_filename, KERNEL_LOAD_ADDR,
-                                    RAM_size - KERNEL_LOAD_ADDR, bswap_needed,
+                                    RAM_size - KERNEL_LOAD_ADDR, true,
                                     TARGET_PAGE_SIZE);
         }
         if (kernel_size < 0) {
-- 
2.48.1