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powerpc/exec: Set thread.regs early during exec 

In later patches during exec, we would like to access default regs.amr to
control access to the user mapping. Having thread.regs set early makes the
code changes simpler.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201127044424.40686-10-aneesh.kumar@linux.ibm.com
This commit is contained in:
Aneesh Kumar K.V 2020-11-27 10:14:11 +05:30 committed by Michael Ellerman
parent d94b827e89
commit d7df77e890
2 changed files with 13 additions and 16 deletions
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2
arch/powerpc/include/asm/thread_info.h
View File

@ -77,10 +77,8 @@ struct thread_info {
/* how to get the thread information struct from C */
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
#ifdef CONFIG_PPC_BOOK3S_64
void arch_setup_new_exec(void);
#define arch_setup_new_exec arch_setup_new_exec
#endif
#endif /* __ASSEMBLY__ */

27
arch/powerpc/kernel/process.c
View File

@ -1531,14 +1531,22 @@ void flush_thread(void)
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
}
#ifdef CONFIG_PPC_BOOK3S_64
void arch_setup_new_exec(void)
{
if (radix_enabled())
return;
hash__setup_new_exec();
}
#ifdef CONFIG_PPC_BOOK3S_64
if (!radix_enabled())
hash__setup_new_exec();
#endif
/*
* If we exec out of a kernel thread then thread.regs will not be
* set. Do it now.
*/
if (!current->thread.regs) {
struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE;
current->thread.regs = regs - 1;
}
}
#ifdef CONFIG_PPC64
/**
@ -1771,15 +1779,6 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
preload_new_slb_context(start, sp);
#endif
/*
* If we exec out of a kernel thread then thread.regs will not be
* set. Do it now.
*/
if (!current->thread.regs) {
struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE;
current->thread.regs = regs - 1;
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/*
* Clear any transactional state, we're exec()ing. The cause is