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zynq: fpsave() and fpclear() both need to disable the fpu

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fpsave needs to disable the fpu! otherwise we won't catch
the mathtrap() in the kernel or when context switching to
another process that will attempt to use it.
This commit is contained in:
cinap_lenrek 2014-12-24 20:53:58 +01:00
parent 1c6daca577
commit 77e0feb67c
1 changed files with 10 additions and 15 deletions
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25
sys/src/9/zynq/l.s
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@ -307,14 +307,6 @@ TEXT fpinit(SB), $0
VMSR(0xe, 0, FPSCR)
RET
TEXT fpsave(SB), $0
VMRS(0xe, FPEXC, 1)
VMRS(0xe, FPSCR, 2)
MOVM.IA.W [R1-R2], (R0)
WORD $0xeca00b20
WORD $0xece00b20
RET
TEXT fprestore(SB), $0
MOVM.IA.W (R0), [R1-R2]
VMSR(0xe, 1, FPEXC)
@ -323,14 +315,17 @@ TEXT fprestore(SB), $0
WORD $0xecf00b20
RET
TEXT fpoff(SB), $0
MOVW $0, R1
VMSR(0xe, 1, FPEXC)
RET
TEXT fpclear(SB), $0
TEXT fpsave(SB), $0
VMRS(0xe, FPEXC, 1)
AND $(3<<30), R1
VMRS(0xe, FPSCR, 2)
MOVM.IA.W [R1-R2], (R0)
WORD $0xeca00b20
WORD $0xece00b20
/* wet floor */
TEXT fpoff(SB), $0
TEXT fpclear(SB), $0
MOVW $0, R1
VMSR(0xe, 1, FPEXC)
RET