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    Contents of /trunk/kernel26-magellan/patches-2.6.16-r10/0124-2.6.16.12-mips-floating-point-exceptions.patch

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    Revision 70 - (show annotations) (download)
    Thu May 11 19:09:22 2006 UTC (18 years ago) by niro
    File size: 1206 byte(s) 
    import
    1 From: Win Treese <treese@acm.org>
    2 Date: Wed, 26 Apr 2006 23:00:04 +0000 (+0100)
    3 Subject: [PATCH] MIPS: Fix branch emulation for floating-point exceptions.
    4 X-Git-Url: http://www.kernel.org/git/?p=linux/kernel/git/stable/linux-2.6.16.y.git;a=commitdiff;h=a5ddce5373218e73fbd58c20a96edd730048529d
    5
    6 [PATCH] MIPS: Fix branch emulation for floating-point exceptions.
    7
    8 In the branch emulation for floating-point exceptions, __compute_return_epc
    9 must determine for bc1f et al which condition code bit to test. This is
    10 based on bits <4:2> of the rt field. The switch statement to distinguish
    11 bc1f et al needs to use only the two low bits of rt, but the old code tests
    12 on the whole rt field. This patch masks off the proper bits.
    13
    14 Signed-off-by: Win Treese <treese@acm.org>
    15 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
    16 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    17 ---
    18
    19 --- a/arch/mips/kernel/branch.c
    20 +++ b/arch/mips/kernel/branch.c
    21 @@ -184,7 +184,7 @@ int __compute_return_epc(struct pt_regs
    22 bit = (insn.i_format.rt >> 2);
    23 bit += (bit != 0);
    24 bit += 23;
    25 - switch (insn.i_format.rt) {
    26 + switch (insn.i_format.rt & 3) {
    27 case 0: /* bc1f */
    28 case 2: /* bc1fl */
    29 if (~fcr31 & (1 << bit))