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MIPS: uprobes: Flush icache via kernel address 

Update arch_uprobe_copy_ixol() to use the kmap_atomic() based kernel
address to flush the icache with flush_icache_range(), rather than the
user mapping. We have the kernel mapping available anyway and this
avoids having to switch to using the new __flush_icache_user_range() for
the sake of Enhanced Virtual Addressing (EVA) where flush_icache_range()
will become ineffective on user addresses.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14154/
Patchwork: https://patchwork.linux-mips.org/patch/14308/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Hogan 2016-09-01 17:30:13 +01:00 committed by Ralf Baechle
parent 8e3a9f4c3a
commit d99a043a9a
1 changed files with 6 additions and 11 deletions
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17
arch/mips/kernel/uprobes.c
View File

@ -282,19 +282,14 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm,
void __weak arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
void *src, unsigned long len)
{
void *kaddr;
unsigned long kaddr, kstart;
/* Initialize the slot */
kaddr = kmap_atomic(page);
memcpy(kaddr + (vaddr & ~PAGE_MASK), src, len);
kunmap_atomic(kaddr);
/*
* The MIPS version of flush_icache_range will operate safely on
* user space addresses and more importantly, it doesn't require a
* VMA argument.
*/
flush_icache_range(vaddr, vaddr + len);
kaddr = (unsigned long)kmap_atomic(page);
kstart = kaddr + (vaddr & ~PAGE_MASK);
memcpy((void *)kstart, src, len);
flush_icache_range(kstart, kstart + len);
kunmap_atomic((void *)kaddr);
}
/**