linux-user: elfload: Provide default for elf_check_arch

For many arch's this macro is defined as the predicatable behaviour
of checking the argument for eqaulity against ELF_ARCH. Provide a
default define as such, so only archs with special handling (usually
allowing multiple EM values) need to provide a def.

Arches that do any of:

1: provide this def exactly the same way as the new default
        (alpha, x86_64)
2: check against ELF_MACHINE while defining ELF_ARCH == ELF_MACHINE
        (arm, aarch64)
3: check against EM_FOO directly while defining ELF_ARCH == EM_FOO
        (unicore32, sparc32, ppc32, mips, openrisc, sh4, cris, m86k)

have their elf_check_arch removed as the default will provide the
correct behaviour.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Acked-By: NRiku Voipio <riku.voipio@linaro.org>
Signed-off-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

linux-user/elfload.c

@@ -145,7 +145,6 @@ static uint32_t get_elf_hwcap(void)
 
 #ifdef TARGET_X86_64
 #define ELF_START_MMAP 0x2aaaaab000ULL
-#define elf_check_arch(x) ( ((x) == ELF_ARCH) )
 
 #define ELF_CLASS      ELFCLASS64
 #define ELF_ARCH       EM_X86_64
@@ -273,8 +272,6 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *en
 
 #define ELF_START_MMAP 0x80000000
 
-#define elf_check_arch(x) ((x) == ELF_MACHINE)
-
 #define ELF_ARCH        ELF_MACHINE
 #define ELF_CLASS       ELFCLASS32
 
@@ -481,8 +478,6 @@ static uint32_t get_elf_hwcap2(void)
 /* 64 bit ARM definitions */
 #define ELF_START_MMAP 0x80000000
 
-#define elf_check_arch(x) ((x) == ELF_MACHINE)
-
 #define ELF_ARCH        ELF_MACHINE
 #define ELF_CLASS       ELFCLASS64
 #define ELF_PLATFORM    "aarch64"
@@ -556,8 +551,6 @@ static uint32_t get_elf_hwcap(void)
 
 #define ELF_START_MMAP          0x80000000
 
-#define elf_check_arch(x)       ((x) == EM_UNICORE32)
-
 #define ELF_CLASS               ELFCLASS32
 #define ELF_DATA                ELFDATA2LSB
 #define ELF_ARCH                EM_UNICORE32
@@ -666,7 +659,6 @@ static inline void init_thread(struct target_pt_regs *regs,
 #define ELF_START_MMAP 0x80000000
 #define ELF_HWCAP  (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
                     | HWCAP_SPARC_MULDIV)
-#define elf_check_arch(x) ( (x) == EM_SPARC )
 
 #define ELF_CLASS   ELFCLASS32
 #define ELF_ARCH    EM_SPARC
@@ -696,8 +688,6 @@ static inline void init_thread(struct target_pt_regs *regs,
 
 #else
 
-#define elf_check_arch(x) ( (x) == EM_PPC )
-
 #define ELF_CLASS       ELFCLASS32
 
 #endif
@@ -875,8 +865,6 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *en
 
 #define ELF_START_MMAP 0x80000000
 
-#define elf_check_arch(x) ( (x) == EM_MIPS )
-
 #ifdef TARGET_MIPS64
 #define ELF_CLASS   ELFCLASS64
 #else
@@ -985,8 +973,6 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMBState *env
 
 #define ELF_START_MMAP 0x08000000
 
-#define elf_check_arch(x) ((x) == EM_OPENRISC)
-
 #define ELF_ARCH EM_OPENRISC
 #define ELF_CLASS ELFCLASS32
 #define ELF_DATA  ELFDATA2MSB
@@ -1026,8 +1012,6 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs,
 
 #define ELF_START_MMAP 0x80000000
 
-#define elf_check_arch(x) ( (x) == EM_SH )
-
 #define ELF_CLASS ELFCLASS32
 #define ELF_ARCH  EM_SH
 
@@ -1110,8 +1094,6 @@ static uint32_t get_elf_hwcap(void)
 
 #define ELF_START_MMAP 0x80000000
 
-#define elf_check_arch(x) ( (x) == EM_CRIS )
-
 #define ELF_CLASS ELFCLASS32
 #define ELF_ARCH  EM_CRIS
 
@@ -1129,8 +1111,6 @@ static inline void init_thread(struct target_pt_regs *regs,
 
 #define ELF_START_MMAP 0x80000000
 
-#define elf_check_arch(x) ( (x) == EM_68K )
-
 #define ELF_CLASS       ELFCLASS32
 #define ELF_ARCH        EM_68K
 
@@ -1182,8 +1162,6 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUM68KState *e
 
 #define ELF_START_MMAP (0x30000000000ULL)
 
-#define elf_check_arch(x) ( (x) == ELF_ARCH )
-
 #define ELF_CLASS      ELFCLASS64
 #define ELF_ARCH       EM_ALPHA
 
@@ -1203,8 +1181,6 @@ static inline void init_thread(struct target_pt_regs *regs,
 
 #define ELF_START_MMAP (0x20000000000ULL)
 
-#define elf_check_arch(x) ( (x) == ELF_ARCH )
-
 #define ELF_CLASS	ELFCLASS64
 #define ELF_DATA	ELFDATA2MSB
 #define ELF_ARCH	EM_S390
@@ -1249,6 +1225,10 @@ static inline void init_thread(struct target_pt_regs *regs,
 #define ELF_MACHINE ELF_ARCH
 #endif
 
+#ifndef elf_check_arch
+#define elf_check_arch(x) ((x) == ELF_ARCH)
+#endif
+
 #ifndef ELF_HWCAP
 #define ELF_HWCAP 0
 #endif