From 6a39dd6222dda5ee2414a1b42e8e62118742a49e Mon Sep 17 00:00:00 2001 From: Daniel Jacobowitz Date: Wed, 30 Aug 2006 15:02:08 +0100 Subject: [PATCH] [ARM] 3759/2: Remove uses of %? Patch from Daniel Jacobowitz The ARM kernel has several uses of asm("foo%?"). %? is a GCC internal modifier used to output conditional execution predicates. However, no version of GCC supports conditionalizing asm statements. GCC 4.2 will correctly expand %? to the empty string in user asms. Earlier versions may reuse the condition from the previous instruction. In 'if (foo) asm ("bar%?");' this is somewhat likely to be right... but not reliable. So, the only safe thing to do is to remove the uses of %?. I believe the tlbflush.h occurances were supposed to be removed before, based on the comment about %? not working at the top of that file. Old versions of GCC could omit branches around user asms if the asm didn't mark the condition codes as clobbered. This problem hasn't been seen on any recent (3.x or 4.x) GCC, but it could theoretically happen. So, where %? was removed a cc clobber was added. Signed-off-by: Daniel Jacobowitz Signed-off-by: Russell King --- arch/arm/kernel/traps.c | 2 +- arch/arm/mach-footbridge/dc21285.c | 27 ++++++++------ arch/arm/vfp/vfpinstr.h | 8 ++-- include/asm-arm/arch-l7200/io.h | 8 ++-- include/asm-arm/tlbflush.h | 76 +++++++++++++++++++------------------- 5 files changed, 62 insertions(+), 59 deletions(-) diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index aeeed80..bede380 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -191,7 +191,7 @@ void show_stack(struct task_struct *tsk, unsigned long *sp) if (tsk != current) fp = thread_saved_fp(tsk); else - asm("mov%? %0, fp" : "=r" (fp)); + asm("mov %0, fp" : "=r" (fp) : : "cc"); c_backtrace(fp, 0x10); barrier(); diff --git a/arch/arm/mach-footbridge/dc21285.c b/arch/arm/mach-footbridge/dc21285.c index 823e25d..a1ae49d 100644 --- a/arch/arm/mach-footbridge/dc21285.c +++ b/arch/arm/mach-footbridge/dc21285.c @@ -69,16 +69,16 @@ dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where, if (addr) switch (size) { case 1: - asm("ldr%?b %0, [%1, %2]" - : "=r" (v) : "r" (addr), "r" (where)); + asm("ldrb %0, [%1, %2]" + : "=r" (v) : "r" (addr), "r" (where) : "cc"); break; case 2: - asm("ldr%?h %0, [%1, %2]" - : "=r" (v) : "r" (addr), "r" (where)); + asm("ldrh %0, [%1, %2]" + : "=r" (v) : "r" (addr), "r" (where) : "cc"); break; case 4: - asm("ldr%? %0, [%1, %2]" - : "=r" (v) : "r" (addr), "r" (where)); + asm("ldr %0, [%1, %2]" + : "=r" (v) : "r" (addr), "r" (where) : "cc"); break; } @@ -103,16 +103,19 @@ dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where, if (addr) switch (size) { case 1: - asm("str%?b %0, [%1, %2]" - : : "r" (value), "r" (addr), "r" (where)); + asm("strb %0, [%1, %2]" + : : "r" (value), "r" (addr), "r" (where) + : "cc"); break; case 2: - asm("str%?h %0, [%1, %2]" - : : "r" (value), "r" (addr), "r" (where)); + asm("strh %0, [%1, %2]" + : : "r" (value), "r" (addr), "r" (where) + : "cc"); break; case 4: - asm("str%? %0, [%1, %2]" - : : "r" (value), "r" (addr), "r" (where)); + asm("str %0, [%1, %2]" + : : "r" (value), "r" (addr), "r" (where) + : "cc"); break; } diff --git a/arch/arm/vfp/vfpinstr.h b/arch/arm/vfp/vfpinstr.h index 6c819ae..7f343a4 100644 --- a/arch/arm/vfp/vfpinstr.h +++ b/arch/arm/vfp/vfpinstr.h @@ -73,14 +73,14 @@ #define fmrx(_vfp_) ({ \ u32 __v; \ - asm("mrc%? p10, 7, %0, " vfpreg(_vfp_) ", cr0, 0 @ fmrx %0, " #_vfp_ \ - : "=r" (__v)); \ + asm("mrc p10, 7, %0, " vfpreg(_vfp_) ", cr0, 0 @ fmrx %0, " #_vfp_ \ + : "=r" (__v) : : "cc"); \ __v; \ }) #define fmxr(_vfp_,_var_) \ - asm("mcr%? p10, 7, %0, " vfpreg(_vfp_) ", cr0, 0 @ fmxr " #_vfp_ ", %0" \ - : : "r" (_var_)) + asm("mcr p10, 7, %0, " vfpreg(_vfp_) ", cr0, 0 @ fmxr " #_vfp_ ", %0" \ + : : "r" (_var_) : "cc") u32 vfp_single_cpdo(u32 inst, u32 fpscr); u32 vfp_single_cprt(u32 inst, u32 fpscr, struct pt_regs *regs); diff --git a/include/asm-arm/arch-l7200/io.h b/include/asm-arm/arch-l7200/io.h index cd080d8..d744d97 100644 --- a/include/asm-arm/arch-l7200/io.h +++ b/include/asm-arm/arch-l7200/io.h @@ -31,9 +31,9 @@ static inline unsigned int __arch_getw(unsigned long a) { unsigned int value; - __asm__ __volatile__("ldr%?h %0, [%1, #0] @ getw" + __asm__ __volatile__("ldrh %0, [%1, #0] @ getw" : "=&r" (value) - : "r" (a)); + : "r" (a) : "cc"); return value; } @@ -42,8 +42,8 @@ static inline unsigned int __arch_getw(unsigned long a) static inline void __arch_putw(unsigned int value, unsigned long a) { - __asm__ __volatile__("str%?h %0, [%1, #0] @ putw" - : : "r" (value), "r" (a)); + __asm__ __volatile__("strh %0, [%1, #0] @ putw" + : : "r" (value), "r" (a) : "cc"); } /* diff --git a/include/asm-arm/tlbflush.h b/include/asm-arm/tlbflush.h index d97fc76..cd10a0b 100644 --- a/include/asm-arm/tlbflush.h +++ b/include/asm-arm/tlbflush.h @@ -247,16 +247,16 @@ static inline void local_flush_tlb_all(void) const unsigned int __tlb_flag = __cpu_tlb_flags; if (tlb_flag(TLB_WB)) - asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); + asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V3_FULL)) - asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V4_U_FULL | TLB_V6_U_FULL)) - asm("mcr%? p15, 0, %0, c8, c7, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c8, c7, 0" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V4_D_FULL | TLB_V6_D_FULL)) - asm("mcr%? p15, 0, %0, c8, c6, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c8, c6, 0" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V4_I_FULL | TLB_V6_I_FULL)) - asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); } static inline void local_flush_tlb_mm(struct mm_struct *mm) @@ -266,25 +266,25 @@ static inline void local_flush_tlb_mm(struct mm_struct *mm) const unsigned int __tlb_flag = __cpu_tlb_flags; if (tlb_flag(TLB_WB)) - asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); + asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (zero) : "cc"); if (cpu_isset(smp_processor_id(), mm->cpu_vm_mask)) { if (tlb_flag(TLB_V3_FULL)) - asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V4_U_FULL)) - asm("mcr%? p15, 0, %0, c8, c7, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c8, c7, 0" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V4_D_FULL)) - asm("mcr%? p15, 0, %0, c8, c6, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c8, c6, 0" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V4_I_FULL)) - asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); } if (tlb_flag(TLB_V6_U_ASID)) - asm("mcr%? p15, 0, %0, c8, c7, 2" : : "r" (asid)); + asm("mcr p15, 0, %0, c8, c7, 2" : : "r" (asid) : "cc"); if (tlb_flag(TLB_V6_D_ASID)) - asm("mcr%? p15, 0, %0, c8, c6, 2" : : "r" (asid)); + asm("mcr p15, 0, %0, c8, c6, 2" : : "r" (asid) : "cc"); if (tlb_flag(TLB_V6_I_ASID)) - asm("mcr%? p15, 0, %0, c8, c5, 2" : : "r" (asid)); + asm("mcr p15, 0, %0, c8, c5, 2" : : "r" (asid) : "cc"); } static inline void @@ -296,27 +296,27 @@ local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm); if (tlb_flag(TLB_WB)) - asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); + asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (zero)); if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) { if (tlb_flag(TLB_V3_PAGE)) - asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (uaddr)); + asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (uaddr) : "cc"); if (tlb_flag(TLB_V4_U_PAGE)) - asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (uaddr)); + asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (uaddr) : "cc"); if (tlb_flag(TLB_V4_D_PAGE)) - asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (uaddr)); + asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (uaddr) : "cc"); if (tlb_flag(TLB_V4_I_PAGE)) - asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (uaddr)); + asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (uaddr) : "cc"); if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL)) - asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); } if (tlb_flag(TLB_V6_U_PAGE)) - asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (uaddr)); + asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (uaddr) : "cc"); if (tlb_flag(TLB_V6_D_PAGE)) - asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (uaddr)); + asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (uaddr) : "cc"); if (tlb_flag(TLB_V6_I_PAGE)) - asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (uaddr)); + asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (uaddr) : "cc"); } static inline void local_flush_tlb_kernel_page(unsigned long kaddr) @@ -327,31 +327,31 @@ static inline void local_flush_tlb_kernel_page(unsigned long kaddr) kaddr &= PAGE_MASK; if (tlb_flag(TLB_WB)) - asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); + asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V3_PAGE)) - asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (kaddr)); + asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (kaddr) : "cc"); if (tlb_flag(TLB_V4_U_PAGE)) - asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (kaddr)); + asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (kaddr) : "cc"); if (tlb_flag(TLB_V4_D_PAGE)) - asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (kaddr)); + asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (kaddr) : "cc"); if (tlb_flag(TLB_V4_I_PAGE)) - asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (kaddr)); + asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (kaddr) : "cc"); if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL)) - asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero)); + asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); if (tlb_flag(TLB_V6_U_PAGE)) - asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (kaddr)); + asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (kaddr) : "cc"); if (tlb_flag(TLB_V6_D_PAGE)) - asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (kaddr)); + asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (kaddr) : "cc"); if (tlb_flag(TLB_V6_I_PAGE)) - asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (kaddr)); + asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (kaddr) : "cc"); /* The ARM ARM states that the completion of a TLB maintenance * operation is only guaranteed by a DSB instruction */ if (tlb_flag(TLB_V6_U_PAGE | TLB_V6_D_PAGE | TLB_V6_I_PAGE)) - asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); + asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (zero) : "cc"); } /* @@ -373,11 +373,11 @@ static inline void flush_pmd_entry(pmd_t *pmd) const unsigned int __tlb_flag = __cpu_tlb_flags; if (tlb_flag(TLB_DCLEAN)) - asm("mcr%? p15, 0, %0, c7, c10, 1 @ flush_pmd" - : : "r" (pmd)); + asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pmd" + : : "r" (pmd) : "cc"); if (tlb_flag(TLB_WB)) - asm("mcr%? p15, 0, %0, c7, c10, 4 @ flush_pmd" - : : "r" (zero)); + asm("mcr p15, 0, %0, c7, c10, 4 @ flush_pmd" + : : "r" (zero) : "cc"); } static inline void clean_pmd_entry(pmd_t *pmd) @@ -385,8 +385,8 @@ static inline void clean_pmd_entry(pmd_t *pmd) const unsigned int __tlb_flag = __cpu_tlb_flags; if (tlb_flag(TLB_DCLEAN)) - asm("mcr%? p15, 0, %0, c7, c10, 1 @ flush_pmd" - : : "r" (pmd)); + asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pmd" + : : "r" (pmd) : "cc"); } #undef tlb_flag -- 2.7.4