Re: [Qemu-devel] [PATCH] disas: Fix printing of addresses in disassembly

["Andreas Färber" <afaerber@suse.de>]

Am 09.07.2012 12:27, schrieb Peter Maydell:
> Ping? [patchwork url http://patchwork.ozlabs.org/patch/167132/]
> 
> -- PMM
> 
> On 25 June 2012 15:55, Peter Maydell <peter.maydell@linaro.org> wrote:
>> 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.)

Is this bug fixed in binutils and didn't make it into QEMU due to GPLv3?
Or is this in QEMU glue code?

Andreas

>>
>> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
>> ---
>>  disas.c |   19 +++++++++++++++++++
>>  1 files changed, 19 insertions(+), 0 deletions(-)
>>
>> diff --git a/disas.c b/disas.c
>> index 93d8d30..7b2acc9 100644
>> --- a/disas.c
>> +++ b/disas.c
>> @@ -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;
>>
>> --
>> 1.7.1
>>
>>
> 


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