From dcef1f634657dabe7905af3ccda12cf7f0b6fcc1 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Wed, 8 Jun 2005 19:00:47 +0100 Subject: [PATCH] ARM: 2664/2: add support for atomic ops on pre-ARMv6 SMP systems Patch from Nicolas Pitre Not that there might be many of them on the planet, but at least RMK apparently has one. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/kernel/traps.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 'arch/arm/kernel/traps.c') diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 14df16b983f4..45d2a032d890 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -464,6 +464,55 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs) #endif return 0; +#ifdef CONFIG_NEEDS_SYSCALL_FOR_CMPXCHG + /* + * Atomically store r1 in *r2 if *r2 is equal to r0 for user space. + * Return zero in r0 if *MEM was changed or non-zero if no exchange + * happened. Also set the user C flag accordingly. + * If access permissions have to be fixed up then non-zero is + * returned and the operation has to be re-attempted. + * + * *NOTE*: This is a ghost syscall private to the kernel. Only the + * __kuser_cmpxchg code in entry-armv.S should be aware of its + * existence. Don't ever use this from user code. + */ + case 0xfff0: + { + extern void do_DataAbort(unsigned long addr, unsigned int fsr, + struct pt_regs *regs); + unsigned long val; + unsigned long addr = regs->ARM_r2; + struct mm_struct *mm = current->mm; + pgd_t *pgd; pmd_t *pmd; pte_t *pte; + + regs->ARM_cpsr &= ~PSR_C_BIT; + spin_lock(&mm->page_table_lock); + pgd = pgd_offset(mm, addr); + if (!pgd_present(*pgd)) + goto bad_access; + pmd = pmd_offset(pgd, addr); + if (!pmd_present(*pmd)) + goto bad_access; + pte = pte_offset_map(pmd, addr); + if (!pte_present(*pte) || !pte_write(*pte)) + goto bad_access; + val = *(unsigned long *)addr; + val -= regs->ARM_r0; + if (val == 0) { + *(unsigned long *)addr = regs->ARM_r1; + regs->ARM_cpsr |= PSR_C_BIT; + } + spin_unlock(&mm->page_table_lock); + return val; + + bad_access: + spin_unlock(&mm->page_table_lock); + /* simulate a read access fault */ + do_DataAbort(addr, 15 + (1 << 11), regs); + return -1; + } +#endif + default: /* Calls 9f00xx..9f07ff are defined to return -ENOSYS if not implemented, rather than raising SIGILL. This -- cgit v1.2.1