Le 15/01/2018 à 23:04, Richard Henderson a écrit :
> On 01/13/2018 06:48 AM, Laurent Vivier wrote:
>> From: YunQiang Su <[email protected]>
>>
>> Move CPU type name selection to a function,
>> and add a function to return ELF e_flags.
>>
>> [lv: splitted the patch and some cleanup in get_elf_eflags()]
>> Signed-off-by: Laurent Vivier <[email protected]>
>> ---
>
> This needs to be split.
>
>> +int get_elf_eflags(int fd, uint32_t *eflags)
>> +{
>> + struct elfhdr ehdr;
>> + off_t offset;
>> + int ret;
>> +
>> + /* Read ELF header */
>> + offset = lseek(fd, 0, SEEK_SET);
>> + if (offset == (off_t) -1) {
>> + return -1;
>> + }
>> + ret = read(fd, &ehdr, sizeof(ehdr));
>> + if (ret < sizeof(ehdr)) {
>> + return -1;
>> + }
>
> There is no reason to read the elf header twice -- e_flags has already been
> stored in the struct image_info.
When we set cpu_model, image_info is not initialized.
Do you propose to move cpu_init() after loader_exec()?
>> +static const char *get_cpu_model(int fd)
>> +{
>> +#if defined(TARGET_I386)
>> +#ifdef TARGET_X86_64
>> + return "qemu64";
>> +#else
>> + return "qemu32";
>> +#endif
>
> This should be our opportunity to split this ifdef chain into small inline
> functions within linux-user/*/target_cpu.h. Pass the e_flags value directly
> instead of a file descriptor.
>
Good idea.
Thanks,
Laurent
