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[IA64] Simulator bootloader fails with gcc 4

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After building a fresh tree with gcc 4 I can't boot the simulator as
the bootloader loader dies with 

loading /home/ianw/kerntest/kerncomp//build/sim_defconfig/vmlinux...
failed to read phdr

After some investigation I believe this is do with differences between
the alignment of variables on the stack between gcc 3 and 4 and the
ski simulator.  If you trace through with the simulator you can see
that the disk_stat structure value returned from the SSC_WAIT_COMPLETION
call seems to be only half loaded.  I guess it doesn't like the alignment
of the input.

Signed-off-by: Ian Wienand <ianw@gelato.unsw.edu.au>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Ian Wienand 2005-07-19 22:32:00 -07:00 committed by Tony Luck
parent 75e8727fbb
commit 4aec0fb122
1 changed files with 5 additions and 1 deletions
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6
arch/ia64/hp/sim/boot/bootloader.c
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@ -30,10 +30,14 @@ struct disk_req {
unsigned len;
};
/* SSC_WAIT_COMPLETION appears to want this large alignment. gcc < 4
* seems to give it by default, however gcc > 4 is smarter and may
* not.
*/
struct disk_stat {
int fd;
unsigned count;
};
} __attribute__ ((aligned (16)));
extern void jmp_to_kernel (unsigned long bp, unsigned long e_entry);
extern struct ia64_boot_param *sys_fw_init (const char *args, int arglen);