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authorGreg Ungerer <gerg@linux-m68k.org>2016-08-29 09:43:51 +0300
committerGreg Ungerer <gerg@linux-m68k.org>2016-09-26 05:02:59 +0300
commit8912eaccb981fd7c2624cbfd56c47c1f6f051420 (patch)
tree7994153bf5051b0a1aff58c1662025cf64741f42 /arch/m68k
parent8cf4a973b47d69227b8ad31d41e4054c59de4dcc (diff)
downloadlinux-8912eaccb981fd7c2624cbfd56c47c1f6f051420.tar.xz
m68k: always make available dump_fpu()
Our local m68k architecture dump_fpu() is conditionally compiled in on CONFIG_FPU. That is OK for all existing MMU enabled CPU types, but won't handle the case for some ColdFire SoC CPU parts that we want to support that have no FPU hardware. dump_fpu() is expected to be present by the ELF loader, so we must always have it available and exported. Remove the conditional and reorganize the dump_fpu hard FPU code path to let the compiler remove code when not needed. This change based on changes and discussion from Yannick Gicquel <yannick.gicquel@open.eurogiciel.org>. Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
Diffstat (limited to 'arch/m68k')
-rw-r--r--arch/m68k/kernel/process.c56
1 files changed, 28 insertions, 28 deletions
diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index c55ff719fa72..4ba1ae7345c3 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -203,11 +203,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
}
/* Fill in the fpu structure for a core dump. */
-#ifdef CONFIG_FPU
int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
{
- char fpustate[216];
-
if (FPU_IS_EMU) {
int i;
@@ -222,37 +219,40 @@ int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
return 1;
}
- /* First dump the fpu context to avoid protocol violation. */
- asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
- if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
- return 0;
+ if (IS_ENABLED(CONFIG_FPU)) {
+ char fpustate[216];
- if (CPU_IS_COLDFIRE) {
- asm volatile ("fmovel %/fpiar,%0\n\t"
- "fmovel %/fpcr,%1\n\t"
- "fmovel %/fpsr,%2\n\t"
- "fmovemd %/fp0-%/fp7,%3"
- :
- : "m" (fpu->fpcntl[0]),
- "m" (fpu->fpcntl[1]),
- "m" (fpu->fpcntl[2]),
- "m" (fpu->fpregs[0])
- : "memory");
- } else {
- asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
- :
- : "m" (fpu->fpcntl[0])
- : "memory");
- asm volatile ("fmovemx %/fp0-%/fp7,%0"
- :
- : "m" (fpu->fpregs[0])
- : "memory");
+ /* First dump the fpu context to avoid protocol violation. */
+ asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
+ if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
+ return 0;
+
+ if (CPU_IS_COLDFIRE) {
+ asm volatile ("fmovel %/fpiar,%0\n\t"
+ "fmovel %/fpcr,%1\n\t"
+ "fmovel %/fpsr,%2\n\t"
+ "fmovemd %/fp0-%/fp7,%3"
+ :
+ : "m" (fpu->fpcntl[0]),
+ "m" (fpu->fpcntl[1]),
+ "m" (fpu->fpcntl[2]),
+ "m" (fpu->fpregs[0])
+ : "memory");
+ } else {
+ asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
+ :
+ : "m" (fpu->fpcntl[0])
+ : "memory");
+ asm volatile ("fmovemx %/fp0-%/fp7,%0"
+ :
+ : "m" (fpu->fpregs[0])
+ : "memory");
+ }
}
return 1;
}
EXPORT_SYMBOL(dump_fpu);
-#endif /* CONFIG_FPU */
unsigned long get_wchan(struct task_struct *p)
{