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MIPS: Correct MIPS I FP context layout

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Implement the correct ordering of individual floating-point registers
within double-precision register pairs for the MIPS I FP context, as
required by our FP emulation code and expected by userland talking via
ptrace(2).  Use L.D and S.D assembly macros that do the right thing like
LDC1 and SDC1 from MIPS II up, avoiding the need to mess up with
endianness conditionals.

This in particular fixes the handling of denormals and NaN generation in
Unimplemented Operation emulation traps.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9699/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2015-04-03 23:26:44 +01:00 • committed by Ralf Baechle
parent 7737b20b9e
commit 80cbfad790
1 changed files with 32 additions and 64 deletions
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96
arch/mips/include/asm/asmmacro-32.h
View file

@ -16,38 +16,22 @@
.set push
SET_HARDFLOAT
cfc1 \tmp, fcr31
swc1 $f0, THREAD_FPR0_LS64(\thread)
swc1 $f1, THREAD_FPR1_LS64(\thread)
swc1 $f2, THREAD_FPR2_LS64(\thread)
swc1 $f3, THREAD_FPR3_LS64(\thread)
swc1 $f4, THREAD_FPR4_LS64(\thread)
swc1 $f5, THREAD_FPR5_LS64(\thread)
swc1 $f6, THREAD_FPR6_LS64(\thread)
swc1 $f7, THREAD_FPR7_LS64(\thread)
swc1 $f8, THREAD_FPR8_LS64(\thread)
swc1 $f9, THREAD_FPR9_LS64(\thread)
swc1 $f10, THREAD_FPR10_LS64(\thread)
swc1 $f11, THREAD_FPR11_LS64(\thread)
swc1 $f12, THREAD_FPR12_LS64(\thread)
swc1 $f13, THREAD_FPR13_LS64(\thread)
swc1 $f14, THREAD_FPR14_LS64(\thread)
swc1 $f15, THREAD_FPR15_LS64(\thread)
swc1 $f16, THREAD_FPR16_LS64(\thread)
swc1 $f17, THREAD_FPR17_LS64(\thread)
swc1 $f18, THREAD_FPR18_LS64(\thread)
swc1 $f19, THREAD_FPR19_LS64(\thread)
swc1 $f20, THREAD_FPR20_LS64(\thread)
swc1 $f21, THREAD_FPR21_LS64(\thread)
swc1 $f22, THREAD_FPR22_LS64(\thread)
swc1 $f23, THREAD_FPR23_LS64(\thread)
swc1 $f24, THREAD_FPR24_LS64(\thread)
swc1 $f25, THREAD_FPR25_LS64(\thread)
swc1 $f26, THREAD_FPR26_LS64(\thread)
swc1 $f27, THREAD_FPR27_LS64(\thread)
swc1 $f28, THREAD_FPR28_LS64(\thread)
swc1 $f29, THREAD_FPR29_LS64(\thread)
swc1 $f30, THREAD_FPR30_LS64(\thread)
swc1 $f31, THREAD_FPR31_LS64(\thread)
s.d $f0, THREAD_FPR0_LS64(\thread)
s.d $f2, THREAD_FPR2_LS64(\thread)
s.d $f4, THREAD_FPR4_LS64(\thread)
s.d $f6, THREAD_FPR6_LS64(\thread)
s.d $f8, THREAD_FPR8_LS64(\thread)
s.d $f10, THREAD_FPR10_LS64(\thread)
s.d $f12, THREAD_FPR12_LS64(\thread)
s.d $f14, THREAD_FPR14_LS64(\thread)
s.d $f16, THREAD_FPR16_LS64(\thread)
s.d $f18, THREAD_FPR18_LS64(\thread)
s.d $f20, THREAD_FPR20_LS64(\thread)
s.d $f22, THREAD_FPR22_LS64(\thread)
s.d $f24, THREAD_FPR24_LS64(\thread)
s.d $f26, THREAD_FPR26_LS64(\thread)
s.d $f28, THREAD_FPR28_LS64(\thread)
s.d $f30, THREAD_FPR30_LS64(\thread)
sw \tmp, THREAD_FCR31(\thread)
.set pop
.endm
@ -56,38 +40,22 @@
.set push
SET_HARDFLOAT
lw \tmp, THREAD_FCR31(\thread)
lwc1 $f0, THREAD_FPR0_LS64(\thread)
lwc1 $f1, THREAD_FPR1_LS64(\thread)
lwc1 $f2, THREAD_FPR2_LS64(\thread)
lwc1 $f3, THREAD_FPR3_LS64(\thread)
lwc1 $f4, THREAD_FPR4_LS64(\thread)
lwc1 $f5, THREAD_FPR5_LS64(\thread)
lwc1 $f6, THREAD_FPR6_LS64(\thread)
lwc1 $f7, THREAD_FPR7_LS64(\thread)
lwc1 $f8, THREAD_FPR8_LS64(\thread)
lwc1 $f9, THREAD_FPR9_LS64(\thread)
lwc1 $f10, THREAD_FPR10_LS64(\thread)
lwc1 $f11, THREAD_FPR11_LS64(\thread)
lwc1 $f12, THREAD_FPR12_LS64(\thread)
lwc1 $f13, THREAD_FPR13_LS64(\thread)
lwc1 $f14, THREAD_FPR14_LS64(\thread)
lwc1 $f15, THREAD_FPR15_LS64(\thread)
lwc1 $f16, THREAD_FPR16_LS64(\thread)
lwc1 $f17, THREAD_FPR17_LS64(\thread)
lwc1 $f18, THREAD_FPR18_LS64(\thread)
lwc1 $f19, THREAD_FPR19_LS64(\thread)
lwc1 $f20, THREAD_FPR20_LS64(\thread)
lwc1 $f21, THREAD_FPR21_LS64(\thread)
lwc1 $f22, THREAD_FPR22_LS64(\thread)
lwc1 $f23, THREAD_FPR23_LS64(\thread)
lwc1 $f24, THREAD_FPR24_LS64(\thread)
lwc1 $f25, THREAD_FPR25_LS64(\thread)
lwc1 $f26, THREAD_FPR26_LS64(\thread)
lwc1 $f27, THREAD_FPR27_LS64(\thread)
lwc1 $f28, THREAD_FPR28_LS64(\thread)
lwc1 $f29, THREAD_FPR29_LS64(\thread)
lwc1 $f30, THREAD_FPR30_LS64(\thread)
lwc1 $f31, THREAD_FPR31_LS64(\thread)
l.d $f0, THREAD_FPR0_LS64(\thread)
l.d $f2, THREAD_FPR2_LS64(\thread)
l.d $f4, THREAD_FPR4_LS64(\thread)
l.d $f6, THREAD_FPR6_LS64(\thread)
l.d $f8, THREAD_FPR8_LS64(\thread)
l.d $f10, THREAD_FPR10_LS64(\thread)
l.d $f12, THREAD_FPR12_LS64(\thread)
l.d $f14, THREAD_FPR14_LS64(\thread)
l.d $f16, THREAD_FPR16_LS64(\thread)
l.d $f18, THREAD_FPR18_LS64(\thread)
l.d $f20, THREAD_FPR20_LS64(\thread)
l.d $f22, THREAD_FPR22_LS64(\thread)
l.d $f24, THREAD_FPR24_LS64(\thread)
l.d $f26, THREAD_FPR26_LS64(\thread)
l.d $f28, THREAD_FPR28_LS64(\thread)
l.d $f30, THREAD_FPR30_LS64(\thread)
ctc1 \tmp, fcr31
.set pop
.endm