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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 bbd426f542 ("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: bbd426f542 ("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>
This commit is contained in:
Maciej W. Rozycki 2018-05-16 16:39:58 +01:00 committed by James Hogan
parent 28e4213dd3
commit c7e814628d
No known key found for this signature in database
GPG Key ID: 35CEE4862B1023F2
2 changed files with 2 additions and 2 deletions
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2
arch/mips/kernel/ptrace.c
View File

@ -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;

2
arch/mips/kernel/ptrace32.c
View File

@ -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;