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authorMaciej W. Rozycki <macro@mips.com>2018-05-16 17:39:58 +0200
committerJames Hogan <jhogan@kernel.org>2018-05-24 15:03:14 +0200
commitc7e814628df65f424fe197dde73bfc67e4a244d7 (patch)
tree50b12208b6edd6f5953348eee071493e7cfe5e30 /arch/mips/kernel/ptrace.c
parentMIPS: prctl: Disallow FRE without FR with PR_SET_FP_MODE requests (diff)
downloadlinux-c7e814628df65f424fe197dde73bfc67e4a244d7.tar.xz
linux-c7e814628df65f424fe197dde73bfc67e4a244d7.zip
MIPS: ptrace: Fix PTRACE_PEEKUSR requests for 64-bit FGRs
Use 64-bit accesses for 64-bit floating-point general registers with PTRACE_PEEKUSR, removing the truncation of their upper halves in the FR=1 mode, caused by commit bbd426f542cb ("MIPS: Simplify FP context access"), which inadvertently switched them to using 32-bit accesses. The PTRACE_POKEUSR side is fine as it's never been broken and continues using 64-bit accesses. Fixes: bbd426f542cb ("MIPS: Simplify FP context access") Signed-off-by: Maciej W. Rozycki <macro@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: <stable@vger.kernel.org> # 3.15+ Patchwork: https://patchwork.linux-mips.org/patch/19334/ Signed-off-by: James Hogan <jhogan@kernel.org>
Diffstat (limited to 'arch/mips/kernel/ptrace.c')
-rw-r--r--arch/mips/kernel/ptrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 8d098b9f395c..0c0c23c9c9f5 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -818,7 +818,7 @@ long arch_ptrace(struct task_struct *child, long request,
break;
}
#endif
- tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
+ tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
break;
case PC:
tmp = regs->cp0_epc;