diff options
author | David Xu <davidxu@FreeBSD.org> | 2006-05-29 02:58:37 +0000 |
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committer | David Xu <davidxu@FreeBSD.org> | 2006-05-29 02:58:37 +0000 |
commit | 5d84379dd634020c88d082abef1acadd42b8fcb0 (patch) | |
tree | 148fc7d55c6f53e985453277d59ea634b8595fde | |
parent | 46f1e0d36c058141cc4d12aa569f1b48d4836dc9 (diff) | |
download | src-5d84379dd634020c88d082abef1acadd42b8fcb0.tar.gz src-5d84379dd634020c88d082abef1acadd42b8fcb0.zip |
Backout changes trying to inherit floating-point environment, although
POSIX (susv3) requires this, but it is unclear what should be inherited,
duplicating whole 387 stack for new thread seems to be unnecessary and
dangerous. Revert to previous code, force a new thread to be started with
clean FP state.
Notes
Notes:
svn path=/head/; revision=159027
-rw-r--r-- | sys/i386/i386/vm_machdep.c | 3 | ||||
-rw-r--r-- | sys/i386/include/npx.h | 3 | ||||
-rw-r--r-- | sys/i386/isa/npx.c | 35 |
3 files changed, 1 insertions, 40 deletions
diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c index f9b954b20e43..26ed735145b8 100644 --- a/sys/i386/i386/vm_machdep.c +++ b/sys/i386/i386/vm_machdep.c @@ -393,8 +393,7 @@ cpu_set_upcall(struct thread *td, struct thread *td0) * more analysis) (need a good safe default). */ bcopy(td0->td_pcb, pcb2, sizeof(*pcb2)); - pcb2->pcb_flags &= ~PCB_NPXTRAP; - npx_fork_thread(td0, td); + pcb2->pcb_flags &= ~(PCB_NPXTRAP|PCB_NPXINITDONE); /* * Create a new fresh stack for the new thread. diff --git a/sys/i386/include/npx.h b/sys/i386/include/npx.h index 792f75a40f3e..86b9af8e7151 100644 --- a/sys/i386/include/npx.h +++ b/sys/i386/include/npx.h @@ -138,8 +138,6 @@ union savefpu { #ifdef _KERNEL -struct thread; - #define IO_NPX 0x0F0 /* Numeric Coprocessor */ #define IO_NPXSIZE 16 /* 80387/80487 NPX registers */ @@ -157,7 +155,6 @@ void npxinit(u_short control); void npxsave(union savefpu *addr); void npxsetregs(struct thread *td, union savefpu *addr); int npxtrap(void); -void npx_fork_thread(struct thread *td, struct thread *newtd); #endif diff --git a/sys/i386/isa/npx.c b/sys/i386/isa/npx.c index 129a853f20ed..bc396294c57d 100644 --- a/sys/i386/isa/npx.c +++ b/sys/i386/isa/npx.c @@ -942,41 +942,6 @@ npxsetregs(td, addr) curthread->td_pcb->pcb_flags |= PCB_NPXINITDONE; } -/* - * POSIX requires new thread to inherit floating-point environment. - */ -void -npx_fork_thread(struct thread *td, struct thread *newtd) -{ - union savefpu *state; - u_int32_t mxcsr; - u_int32_t cw; - - if (!(td->td_pcb->pcb_flags & PCB_NPXINITDONE)) { - newtd->td_pcb->pcb_flags &= ~PCB_NPXINITDONE; - return; - } - - state = &newtd->td_pcb->pcb_save; - /* get control word */ - if (npxgetregs(td, state)) - return; - if (cpu_fxsr) { - mxcsr = state->sv_xmm.sv_env.en_mxcsr; - cw = state->sv_xmm.sv_env.en_cw; - } else { - cw = state->sv_87.sv_env.en_cw; - mxcsr = 0; - } - bcopy(&npx_cleanstate, state, sizeof(*state)); - if (cpu_fxsr) { - state->sv_xmm.sv_env.en_cw = cw; - state->sv_xmm.sv_env.en_mxcsr = mxcsr; - } else - state->sv_87.sv_env.en_cw = cw; - newtd->td_pcb->pcb_flags |= PCB_NPXINITDONE; -} - static void fpusave(addr) union savefpu *addr; |