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Take another shot at the invariants calls to __panic. They hadn't been

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updated for the regparm ABI on amd64.
Context switch debug regs.
Update for fpu simplification
Don't needlessly reload %cr3, in case the cpu has the tlb flush filter
turned off.  Re-add LAZY_SWITCH stubs.
This commit is contained in:
Peter Wemm 2004-01-29 00:02:54 +00:00
parent fdf00d6d6c
commit db5272252f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=125181
1 changed files with 73 additions and 17 deletions
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90
sys/amd64/amd64/cpu_switch.S
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@ -38,6 +38,7 @@
*/
#include <machine/asmacros.h>
#include <machine/specialreg.h>
#include "assym.s"
@ -130,16 +131,36 @@ ENTRY(cpu_switch)
movl %fs,PCB_FS(%r8)
movl %gs,PCB_GS(%r8)
/* Test if debug registers should be saved. */
testl $PCB_DBREGS,PCB_FLAGS(%r8)
jz 1f /* no, skip over */
movq %dr7,%rax /* yes, do the save */
movq %rax,PCB_DR7(%r8)
andq $0x0000fc00, %rax /* disable all watchpoints */
movq %rax,%dr7
movq %dr6,%rax
movq %rax,PCB_DR6(%r8)
movq %dr3,%rax
movq %rax,PCB_DR3(%r8)
movq %dr2,%rax
movq %rax,PCB_DR2(%r8)
movq %dr1,%rax
movq %rax,PCB_DR1(%r8)
movq %dr0,%rax
movq %rax,PCB_DR0(%r8)
1:
/* have we used fp, and need a save? */
cmpq %rdi,PCPU(FPCURTHREAD)
jne 1f
pushq %rdi
pushq %rsi
addq $PCB_SAVEFPU,%r8 /* h/w bugs make saving complicated */
movq %r8, %rdi
call fpusave /* do it in a big C function */
popq %rsi
popq %rdi
addq $PCB_SAVEFPU,%r8
clts
fxsave (%r8)
smsw %ax
orb $CR0_TS,%al
lmsw %ax
xorq %rax,%rax
movq %rax,PCPU(FPCURTHREAD)
1:
/* Save is done. Now fire up new thread. Leave old vmspace. */
@ -148,12 +169,19 @@ ENTRY(cpu_switch)
jz badsw3 /* no, panic */
#endif
movq TD_PCB(%rsi),%r8
movl PCPU(CPUID), %eax
/* switch address space */
movq PCB_CR3(%r8),%rdx
#ifdef LAZY_SWITCH
cmpq %rdx,KPML4phys /* Kernel address space? */
je sw1
#endif
movq %cr3,%rax
cmpq %rdx,%rax /* Same address space? */
je sw1
movq %rdx,%cr3 /* new address space */
movl PCPU(CPUID), %eax
/* Release bit from old pmap->pm_active */
movq TD_PROC(%rdi), %rdx /* oldproc */
movq P_VMSPACE(%rdx), %rdx
@ -223,6 +251,28 @@ sw1:
movq %r8, PCPU(CURPCB)
movq %rsi, PCPU(CURTHREAD) /* into next thread */
/* Test if debug registers should be restored. */
testl $PCB_DBREGS,PCB_FLAGS(%r8)
jz 1f
movq PCB_DR6(%r8),%rax
movq %rax,%dr6
movq PCB_DR3(%r8),%rax
movq %rax,%dr3
movq PCB_DR2(%r8),%rax
movq %rax,%dr2
movq PCB_DR1(%r8),%rax
movq %rax,%dr1
movq PCB_DR0(%r8),%rax
movq %rax,%dr0
/* But preserve reserved bits in %dr7 */
movq %dr7,%rax
andq $0x0000fc00,%rax
movq PCB_DR7(%r8),%rcx
andq $~0x0000fc00,%rcx
orq %rcx,%rax
movq %rax,%dr7
1:
ret
#ifdef INVARIANTS
@ -242,7 +292,9 @@ badsw1:
pushq %r13
pushq %r14
pushq %r15
pushq $sw0_1
movq $0,%rdi
movq $0,%rsi
leaq sw0_1,%rdx
call __panic
sw0_1: .asciz "cpu_throw: no newthread supplied"
@ -262,7 +314,9 @@ badsw2:
pushq %r13
pushq %r14
pushq %r15
pushq $sw0_2
movq $0,%rdi
movq $0,%rsi
leaq sw0_2,%rdx
call __panic
sw0_2: .asciz "cpu_switch: no curthread supplied"
@ -282,7 +336,9 @@ badsw3:
pushq %r13
pushq %r14
pushq %r15
pushq $sw0_3
movq $0,%rdi
movq $0,%rsi
leaq sw0_3,%rdx
call __panic
sw0_3: .asciz "cpu_switch: no newthread supplied"
#endif
@ -332,17 +388,17 @@ ENTRY(savectx)
testq %rax,%rax
je 1f
pushq %rcx
pushq %rax
movq TD_PCB(%rax),%rdi
leaq PCB_SAVEFPU(%rdi),%rdi
call fpusave
popq %rax
popq %rcx
clts
fxsave (%rdi)
smsw %ax
orb $CR0_TS,%al
lmsw %ax
movq $PCB_SAVEFPU_SIZE,%rdx /* arg 3 */
leaq PCB_SAVEFPU(%rcx),%rsi /* arg 2 */
movq %rax,%rdi /* arg 1 */
/* arg 1 (%rdi) already loaded */
call bcopy
1:
popfq