From 6cec7c4ad79f8fd66574044adfa284b20ee7c4fd Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Mon, 27 Jan 2014 15:23:06 +0000 Subject: [PATCH] MIPS: Don't assume 64-bit FP registers for dump_{,task_}fpu This code assumed that saved FP registers are 64 bits wide, an assumption which will no longer be true once MSA is introduced. This patch modifies the code to copy the lower 64 bits of each register in turn, which is safe for any FP register width >= 64 bits. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6425/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/process.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 6ae540e..2f01f3d 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -157,7 +157,13 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, /* Fill in the fpu structure for a core dump.. */ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r) { - memcpy(r, ¤t->thread.fpu, sizeof(current->thread.fpu)); + int i; + + for (i = 0; i < NUM_FPU_REGS; i++) + memcpy(&r[i], ¤t->thread.fpu.fpr[i], sizeof(*r)); + + memcpy(&r[NUM_FPU_REGS], ¤t->thread.fpu.fcr31, + sizeof(current->thread.fpu.fcr31)); return 1; } @@ -192,7 +198,13 @@ int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) int dump_task_fpu(struct task_struct *t, elf_fpregset_t *fpr) { - memcpy(fpr, &t->thread.fpu, sizeof(current->thread.fpu)); + int i; + + for (i = 0; i < NUM_FPU_REGS; i++) + memcpy(&fpr[i], &t->thread.fpu.fpr[i], sizeof(*fpr)); + + memcpy(&fpr[NUM_FPU_REGS], &t->thread.fpu.fcr31, + sizeof(t->thread.fpu.fcr31)); return 1; } -- 2.7.4