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Userspace ARM BE8 support

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Add support for ARM BE8 userspace binaries.
i.e. big-endian data and little-endian code.
In principle LE8 mode is also possible, but AFAIK has never actually
been implemented/used.

System emulation doesn't have any useable big-endian board models,
but should in principle work once you fix that.
Dynamic endianness switching requires messing with data accesses,
preferably with TCG cooperation, and is orthogonal to BE8 support.

Signed-off-by: Paul Brook <paul@codesourcery.com>
[PMM: various changes, mostly as per my suggestions in code review:
 * rebase
 * use EF_ defines rather than hardcoded constants
 * make bswap_code a bool for future VMSTATE macro compatibility
 * update comment in cpu.h about TB flags bit field usage
 * factor out load-code-and-swap into arm_ld*_code functions and
   get_user_code* macros
 * fix stray trailing space at end of line
 * added braces in disas.c to satisfy checkpatch
]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Paul Brook 2012-03-30 18:02:50 +01:00 • committed by Riku Voipio
parent ef8b0c0474
commit d8fd295499
7 changed files with 86 additions and 20 deletions
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18
disas.c
View file

@ -138,7 +138,7 @@ print_insn_thumb1(bfd_vma pc, disassemble_info *info)
/* Disassemble this for me please... (debugging). 'flags' has the following
values:
i386 - 1 means 16 bit code, 2 means 64 bit code
arm - nonzero means thumb code
arm - bit 0 = thumb, bit 1 = reverse endian
ppc - nonzero means little endian
other targets - unused
*/
@ -169,10 +169,18 @@ void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
disasm_info.mach = bfd_mach_i386_i386;
print_insn = print_insn_i386;
#elif defined(TARGET_ARM)
if (flags)
print_insn = print_insn_thumb1;
else
print_insn = print_insn_arm;
if (flags & 1) {
print_insn = print_insn_thumb1;
} else {
print_insn = print_insn_arm;
}
if (flags & 2) {
#ifdef TARGET_WORDS_BIGENDIAN
disasm_info.endian = BFD_ENDIAN_LITTLE;
#else
disasm_info.endian = BFD_ENDIAN_BIG;
#endif
}
#elif defined(TARGET_SPARC)
print_insn = print_insn_sparc;
#ifdef TARGET_SPARC64