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x86: pass in pt_regs pointer for syscalls that need it

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Some syscalls need to access the pt_regs structure, either to copy
user register state or to modifiy it.  This patch adds stubs to load
the address of the pt_regs struct into the %eax register, and changes
the syscalls to regparm(1) to receive the pt_regs pointer as the
first argument.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Brian Gerst
2009-02-10 09:51:46 -05:00
committed by Ingo Molnar
parent aa78bcfa01
commit 253f29a4ae
8 changed files with 81 additions and 80 deletions
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4
arch/x86/kernel/ioport.c
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@ -131,10 +131,8 @@ static int do_iopl(unsigned int level, struct pt_regs *regs)
}
#ifdef CONFIG_X86_32
asmlinkage long sys_iopl(unsigned long regsp)
ptregscall long sys_iopl(struct pt_regs *regs, unsigned int level)
{
struct pt_regs *regs = (struct pt_regs *)&regsp;
unsigned int level = regs->bx;
struct thread_struct *t = &current->thread;
int rc;