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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] [IA64] Preparation patch for xen specivic gate page
# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1185983616 21600
# Node ID 1c675d3a2a22e642dbbf32e164a170ee06cc53a2
# Parent a1682dc021bc16eec86f09b6d9a389c19497423b
[IA64] Preparation patch for xen specivic gate page
Move __kernel_sigtramp up to allow to increase in
__kernel_syscall_via_epc size.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
arch/ia64/kernel/gate.S | 324 ++++++++++++++++++++++++------------------------
1 files changed, 162 insertions(+), 162 deletions(-)
diff -r a1682dc021bc -r 1c675d3a2a22 arch/ia64/kernel/gate.S
--- a/arch/ia64/kernel/gate.S Wed Aug 01 09:44:54 2007 -0600
+++ b/arch/ia64/kernel/gate.S Wed Aug 01 09:53:36 2007 -0600
@@ -42,168 +42,6 @@
[1:] movl reg=0; \
.xdata4 ".data.patch.running_on_xen", 1b-.
#endif /* CONFIG_XEN_IA64_VDSO_PARAVIRT */
-
-GLOBAL_ENTRY(__kernel_syscall_via_break)
- .prologue
- .altrp b6
- .body
- /*
- * Note: for (fast) syscall restart to work, the break instruction must
be
- * the first one in the bundle addressed by syscall_via_break.
- */
-{ .mib
- break 0x100000
- nop.i 0
- br.ret.sptk.many b6
-}
-END(__kernel_syscall_via_break)
-
-/*
- * On entry:
- * r11 = saved ar.pfs
- * r15 = system call #
- * b0 = saved return address
- * b6 = return address
- * On exit:
- * r11 = saved ar.pfs
- * r15 = system call #
- * b0 = saved return address
- * all other "scratch" registers: undefined
- * all "preserved" registers: same as on entry
- */
-
-GLOBAL_ENTRY(__kernel_syscall_via_epc)
- .prologue
- .altrp b6
- .body
-{
- /*
- * Note: the kernel cannot assume that the first two instructions in
this
- * bundle get executed. The remaining code must be safe even if
- * they do not get executed.
- */
- adds r17=-1024,r15 // A
- mov r10=0 // A default to successful
syscall execution
- epc // B causes split-issue
-}
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
- // r20 = 1
- // r22 = &vcpu->vcpu_info->evtchn_upcall_mask
- // r24 = &vcpu->vcpu_info->evtchn_upcall_pending
- // r25 = tmp
- // r28 = &running_on_xen
- // r30 = running_on_xen
- // r31 = tmp
- // p11 = tmp
- // p12 = running_on_xen
- // p13 = !running_on_xen
- // p14 = tmp
- // p15 = tmp
-#define isXen p12
-#define isRaw p13
- LOAD_RUNNING_ON_XEN(r28)
- movl r22=XSI_PSR_I_ADDR
- mov r20=1
- ;;
- ld4 r30=[r28]
- ;;
- cmp.ne isXen,isRaw=r0,r30
- ;;
-(isXen) ld8 r22=[r22]
- ;;
-(isRaw) rsm psr.be | psr.i
-(isXen) adds r24=-1,r22
-(isXen) st1 [r22]=r20
-(isXen) rum psr.be
-#else
- ;;
- rsm psr.be | psr.i // M2 (5 cyc to srlz.d)
-#endif
- LOAD_FSYSCALL_TABLE(r14) // X
- ;;
- mov r16=IA64_KR(CURRENT) // M2 (12 cyc)
- shladd r18=r17,3,r14 // A
- mov r19=NR_syscalls-1 // A
- ;;
- lfetch [r18] // M0|1
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
-(isRaw) mov r29=psr
-(isXen) XEN_HYPER_GET_PSR
- ;;
-(isXen) mov r29=r8
-#else
- mov r29=psr // M2 (12 cyc)
-#endif
- // If r17 is a NaT, p6 will be zero
- cmp.geu p6,p7=r19,r17 // A (sysnr > 0 && sysnr <
1024+NR_syscalls)?
- ;;
- mov r21=ar.fpsr // M2 (12 cyc)
- tnat.nz p10,p9=r15 // I0
- mov.i r26=ar.pfs // I0 (would stall anyhow due
to srlz.d...)
- ;;
- srlz.d // M0 (forces split-issue)
ensure PSR.BE==0
-(p6) ld8 r18=[r18] // M0|1
- nop.i 0
- ;;
- nop.m 0
-(p6) tbit.z.unc p8,p0=r18,0 // I0 (dual-issues with "mov
b7=r18"!)
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
-
-#define XEN_SET_PSR_I(pred) \
-(pred) ld1 r31=[r22]; \
- ;; ; \
-(pred) st1 [r22]=r0; \
-(pred) cmp.ne.unc p14,p0=r0,r31; \
- ;; ; \
-(p14) ld1 r25=[r24]; \
- ;; ; \
-(p14) cmp.ne.unc p11,p0=r0,r25; \
- ;; ; \
-(p11) XEN_HYPER_SSM_I;
-
- ;;
- // p14 = running_on_xen && p8
- // p15 = !running_on_xen && p8
-(p8) cmp.ne.unc p14,p15=r0,r30
- ;;
-(p15) ssm psr.i
- XEN_SET_PSR_I(p14)
-#else
- nop.i 0
- ;;
-(p8) ssm psr.i
-#endif
-(p6) mov b7=r18 // I0
-(p8) br.dptk.many b7 // B
-
- mov r27=ar.rsc // M2 (12 cyc)
-/*
- * brl.cond doesn't work as intended because the linker would convert this
branch
- * into a branch to a PLT. Perhaps there will be a way to avoid this with some
- * future version of the linker. In the meantime, we just use an indirect
branch
- * instead.
- */
-#ifdef CONFIG_ITANIUM
-(p6) add r14=-8,r14 // r14 <- addr of
fsys_bubble_down entry
- ;;
-(p6) ld8 r14=[r14] // r14 <- fsys_bubble_down
- ;;
-(p6) mov b7=r14
-(p6) br.sptk.many b7
-#else
- BRL_COND_FSYS_BUBBLE_DOWN(p6)
-#endif
-#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
-(isRaw) ssm psr.i
- XEN_SET_PSR_I(isXen)
-#else
- ssm psr.i
-#endif
- mov r10=-1
-(p10) mov r8=EINVAL
-(p9) mov r8=ENOSYS
- FSYS_RETURN
-END(__kernel_syscall_via_epc)
# define ARG0_OFF (16 + IA64_SIGFRAME_ARG0_OFFSET)
# define ARG1_OFF (16 + IA64_SIGFRAME_ARG1_OFFSET)
@@ -450,3 +288,165 @@ restore_rbs:
// invala not necessary as that will happen when returning to user-mode
br.cond.sptk back_from_restore_rbs
END(__kernel_sigtramp)
+
+GLOBAL_ENTRY(__kernel_syscall_via_break)
+ .prologue
+ .altrp b6
+ .body
+ /*
+ * Note: for (fast) syscall restart to work, the break instruction must
be
+ * the first one in the bundle addressed by syscall_via_break.
+ */
+{ .mib
+ break 0x100000
+ nop.i 0
+ br.ret.sptk.many b6
+}
+END(__kernel_syscall_via_break)
+
+/*
+ * On entry:
+ * r11 = saved ar.pfs
+ * r15 = system call #
+ * b0 = saved return address
+ * b6 = return address
+ * On exit:
+ * r11 = saved ar.pfs
+ * r15 = system call #
+ * b0 = saved return address
+ * all other "scratch" registers: undefined
+ * all "preserved" registers: same as on entry
+ */
+
+GLOBAL_ENTRY(__kernel_syscall_via_epc)
+ .prologue
+ .altrp b6
+ .body
+{
+ /*
+ * Note: the kernel cannot assume that the first two instructions in
this
+ * bundle get executed. The remaining code must be safe even if
+ * they do not get executed.
+ */
+ adds r17=-1024,r15 // A
+ mov r10=0 // A default to successful
syscall execution
+ epc // B causes split-issue
+}
+#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+ // r20 = 1
+ // r22 = &vcpu->vcpu_info->evtchn_upcall_mask
+ // r24 = &vcpu->vcpu_info->evtchn_upcall_pending
+ // r25 = tmp
+ // r28 = &running_on_xen
+ // r30 = running_on_xen
+ // r31 = tmp
+ // p11 = tmp
+ // p12 = running_on_xen
+ // p13 = !running_on_xen
+ // p14 = tmp
+ // p15 = tmp
+#define isXen p12
+#define isRaw p13
+ LOAD_RUNNING_ON_XEN(r28)
+ movl r22=XSI_PSR_I_ADDR
+ mov r20=1
+ ;;
+ ld4 r30=[r28]
+ ;;
+ cmp.ne isXen,isRaw=r0,r30
+ ;;
+(isXen) ld8 r22=[r22]
+ ;;
+(isRaw) rsm psr.be | psr.i
+(isXen) adds r24=-1,r22
+(isXen) st1 [r22]=r20
+(isXen) rum psr.be
+#else
+ ;;
+ rsm psr.be | psr.i // M2 (5 cyc to srlz.d)
+#endif
+ LOAD_FSYSCALL_TABLE(r14) // X
+ ;;
+ mov r16=IA64_KR(CURRENT) // M2 (12 cyc)
+ shladd r18=r17,3,r14 // A
+ mov r19=NR_syscalls-1 // A
+ ;;
+ lfetch [r18] // M0|1
+#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+(isRaw) mov r29=psr
+(isXen) XEN_HYPER_GET_PSR
+ ;;
+(isXen) mov r29=r8
+#else
+ mov r29=psr // M2 (12 cyc)
+#endif
+ // If r17 is a NaT, p6 will be zero
+ cmp.geu p6,p7=r19,r17 // A (sysnr > 0 && sysnr <
1024+NR_syscalls)?
+ ;;
+ mov r21=ar.fpsr // M2 (12 cyc)
+ tnat.nz p10,p9=r15 // I0
+ mov.i r26=ar.pfs // I0 (would stall anyhow due
to srlz.d...)
+ ;;
+ srlz.d // M0 (forces split-issue)
ensure PSR.BE==0
+(p6) ld8 r18=[r18] // M0|1
+ nop.i 0
+ ;;
+ nop.m 0
+(p6) tbit.z.unc p8,p0=r18,0 // I0 (dual-issues with "mov
b7=r18"!)
+#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+
+#define XEN_SET_PSR_I(pred) \
+(pred) ld1 r31=[r22]; \
+ ;; ; \
+(pred) st1 [r22]=r0; \
+(pred) cmp.ne.unc p14,p0=r0,r31; \
+ ;; ; \
+(p14) ld1 r25=[r24]; \
+ ;; ; \
+(p14) cmp.ne.unc p11,p0=r0,r25; \
+ ;; ; \
+(p11) XEN_HYPER_SSM_I;
+
+ ;;
+ // p14 = running_on_xen && p8
+ // p15 = !running_on_xen && p8
+(p8) cmp.ne.unc p14,p15=r0,r30
+ ;;
+(p15) ssm psr.i
+ XEN_SET_PSR_I(p14)
+#else
+ nop.i 0
+ ;;
+(p8) ssm psr.i
+#endif
+(p6) mov b7=r18 // I0
+(p8) br.dptk.many b7 // B
+
+ mov r27=ar.rsc // M2 (12 cyc)
+/*
+ * brl.cond doesn't work as intended because the linker would convert this
branch
+ * into a branch to a PLT. Perhaps there will be a way to avoid this with some
+ * future version of the linker. In the meantime, we just use an indirect
branch
+ * instead.
+ */
+#ifdef CONFIG_ITANIUM
+(p6) add r14=-8,r14 // r14 <- addr of
fsys_bubble_down entry
+ ;;
+(p6) ld8 r14=[r14] // r14 <- fsys_bubble_down
+ ;;
+(p6) mov b7=r14
+(p6) br.sptk.many b7
+#else
+ BRL_COND_FSYS_BUBBLE_DOWN(p6)
+#endif
+#ifdef CONFIG_XEN_IA64_VDSO_PARAVIRT
+(isRaw) ssm psr.i
+ XEN_SET_PSR_I(isXen)
+#else
+ ssm psr.i
+#endif
+ mov r10=-1
+(p10) mov r8=EINVAL
+(p9) mov r8=ENOSYS
+ FSYS_RETURN
+END(__kernel_syscall_via_epc)
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