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disas: Fix printing of addresses in disassembly

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In our disassembly code, the bfd_vma type is always 64 bits,
even if the target's virtual address width is only 32 bits. This
means that when we print out addresses we need to truncate them
to 32 bits, to avoid odd output which has incorrectly sign-extended
a value to 64 bits, for instance this ARM example:
    0x80479a60:  e59f4088     ldr  r4, [pc, #136]  ; 0xffffffff80479a4f

(It would also be possible to truncate before passing the address
to info->print_address_func(), but truncating in the final print
function is the same approach that binutils takes to this problem.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Peter Maydell 2012-06-25 04:55:55 +00:00 committed by Blue Swirl
parent fabaaf1d1f
commit 636bd28939
1 changed files with 19 additions and 0 deletions
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19
disas.c
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@ -64,6 +64,22 @@ generic_print_address (bfd_vma addr, struct disassemble_info *info)
(*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);
}
/* Print address in hex, truncated to the width of a target virtual address. */
static void
generic_print_target_address(bfd_vma addr, struct disassemble_info *info)
{
uint64_t mask = ~0ULL >> (64 - TARGET_VIRT_ADDR_SPACE_BITS);
generic_print_address(addr & mask, info);
}
/* Print address in hex, truncated to the width of a host virtual address. */
static void
generic_print_host_address(bfd_vma addr, struct disassemble_info *info)
{
uint64_t mask = ~0ULL >> (64 - (sizeof(void *) * 8));
generic_print_address(addr & mask, info);
}
/* Just return the given address. */
int
@ -154,6 +170,7 @@ void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
disasm_info.read_memory_func = target_read_memory;
disasm_info.buffer_vma = code;
disasm_info.buffer_length = size;
disasm_info.print_address_func = generic_print_target_address;
#ifdef TARGET_WORDS_BIGENDIAN
disasm_info.endian = BFD_ENDIAN_BIG;
@ -274,6 +291,7 @@ void disas(FILE *out, void *code, unsigned long size)
int (*print_insn)(bfd_vma pc, disassemble_info *info);
INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
disasm_info.print_address_func = generic_print_host_address;
disasm_info.buffer = code;
disasm_info.buffer_vma = (uintptr_t)code;
@ -386,6 +404,7 @@ void monitor_disas(Monitor *mon, CPUArchState *env,
monitor_disas_env = env;
monitor_disas_is_physical = is_physical;
disasm_info.read_memory_func = monitor_read_memory;
disasm_info.print_address_func = generic_print_target_address;
disasm_info.buffer_vma = pc;