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authorMaciej W. Rozycki <macro@mips.com>2018-05-16 16:39:58 +0100
committerJames Hogan <jhogan@kernel.org>2018-05-24 14:03:14 +0100
commitc7e814628df65f424fe197dde73bfc67e4a244d7 (patch)
tree50b12208b6edd6f5953348eee071493e7cfe5e30 /arch
parent28e4213dd331e944e7fca1954a946829162ed9d4 (diff)
downloadlinux-c7e814628df65f424fe197dde73bfc67e4a244d7.tar.bz2
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')
-rw-r--r--arch/mips/kernel/ptrace.c2
-rw-r--r--arch/mips/kernel/ptrace32.c2
2 files changed, 2 insertions, 2 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;
diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
index 656a137c1fe2..f30c381d3e1c 100644
--- a/arch/mips/kernel/ptrace32.c
+++ b/arch/mips/kernel/ptrace32.c
@@ -109,7 +109,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
addr & 1);
break;
}
- tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
+ tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
break;
case PC:
tmp = regs->cp0_epc;