patch-2.1.44 linux/arch/sparc64/kernel/etrap.S

Next file: linux/arch/sparc64/kernel/hack.S
Previous file: linux/arch/sparc64/kernel/entry.S
Back to the patch index
Back to the overall index
Lines: 213
Date: Mon Jul 7 08:18:54 1997
Orig file: v2.1.43/linux/arch/sparc64/kernel/etrap.S
Orig date: Mon Jun 16 16:35:54 1997

diff -u --recursive --new-file v2.1.43/linux/arch/sparc64/kernel/etrap.S linux/arch/sparc64/kernel/etrap.S
@@ -1,4 +1,4 @@
-/* $Id: etrap.S,v 1.21 1997/06/02 06:33:28 davem Exp $
+/* $Id: etrap.S,v 1.30 1997/06/30 10:31:37 jj Exp $
  * etrap.S: Preparing for entry into the kernel on Sparc V9.
  *
  * Copyright (C) 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
@@ -12,88 +12,121 @@
 #include <asm/spitfire.h>
 #include <asm/head.h>
 
-	/* We assume that pstate, when entering this, has AG and
-	 * IE bits set, MG and IG clear.
-	 *
-	 * We also guarentee for caller that AG %g4 and %g5 will have
-	 * their values preserved and left in %l4 and %l5 respectively
-	 * for him (fault handling needs this).
-	 */
-
-	.text
-	.align	32
-	.globl	etrap, etrap_irq, etraptl1
-etrap:
-	rdpr		%pil, %g2
-etrap_irq:
-	rdpr		%tstate, %g1
-	sllx		%g2, 20, %g2
-	or		%g1, %g2, %g1
-	andcc		%g1, TSTATE_PRIV, %g0
-	bne,a,pn	%xcc, 1f
-	 sub		%sp, REGWIN_SZ + TRACEREG_SZ - STACK_BIAS, %g2
-	rd		%pic, %g3
-
-	sethi		%hi((PAGE_SIZE<<1)-TRACEREG_SZ-REGWIN_SZ), %g2
-	or		%g2, %lo((PAGE_SIZE<<1)-TRACEREG_SZ-REGWIN_SZ), %g2
-	add		%g3, %g2, %g2
-1:	stx		%g1, [%g2 + REGWIN_SZ + PT_V9_TSTATE]
-	rdpr		%tpc, %g1
-	rdpr		%tnpc, %g3
-	stx		%g1, [%g2 + REGWIN_SZ + PT_V9_TPC]
-	rd		%y, %g1
-
-	stx		%g3, [%g2 + REGWIN_SZ + PT_V9_TNPC]
-	stx		%g1, [%g2 + REGWIN_SZ + PT_V9_Y]
-	save		%g2, -STACK_BIAS, %sp	! The ordering of these two instructions
-	rdpr		%pstate, %g1		! is critical, see winfixup.S for details
-	bne,pn		%xcc, 2f
-	 rdpr		%canrestore, %g3
-	rdpr		%wstate, %g6
-	wrpr		%g0, 7, %cleanwin
-
-	wrpr		%g0, 0, %canrestore
-	sll		%g6, 3, %g6
-	wrpr		%g3, 0, %otherwin
-	wrpr		%g6, %wstate
-	sethi		%uhi(KERNBASE), %g3
-	sllx		%g3, 32, %g3
-	mov		PRIMARY_CONTEXT, %g2
-	stxa		%g0, [%g2] ASI_DMMU
-
-	flush		%g3
-2:	wrpr		%g0, 0x0, %tl
-	mov		%g1, %l1
-	mov		%g4, %l4
-	mov		%g5, %l5
-	mov		%g7, %l2
-	wrpr		%l1, PSTATE_AG, %pstate
-	stx		%g1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G1]
-
-	stx		%g2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G2]
-	stx		%g3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G3]
-	stx		%g4, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G4]
-	stx		%g5, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G5]
-	stx		%g6, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G6]
-	stx		%g7, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G7]
-	stx		%i0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0]
-	stx		%i1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I1]
-
-	stx		%i2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I2]
-	stx		%i3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I3]
-	stx		%i4, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I4]
-	stx		%i5, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I5]
-	stx		%i6, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I6]
-	stx		%i7, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I7]
-	wrpr		%l1, (PSTATE_IE | PSTATE_AG), %pstate
-	sethi		%uhi(KERNBASE), %g4
-
-	rd		%pic, %g6
-	jmpl		%l2 + 0x4, %g0
-	 sllx		%g4, 32, %g4
-etraptl1:
-	rdpr	%tstate, %g1
-	sub	%sp, REGWIN_SZ + TRACEREG_SZ - STACK_BIAS, %g2
-	ba,pt	%xcc, 1b
-	 andcc	%g1, TSTATE_PRIV, %g0
-	nop
+#define		FPUREG_SZ		((64 * 4) + (2 * 8))
+#define		TASK_REGOFF		((((PAGE_SIZE<<1)-FPUREG_SZ)&~(64-1)) - \
+					 TRACEREG_SZ-REGWIN_SZ)
+
+		.text
+		.align			32
+		.globl			etrap, etrap_irq, etraptl1
+
+etrap:		rdpr			%pil, %g2
+etrap_irq:	rdpr			%tstate, %g1
+		sllx			%g2, 20, %g2
+		or			%g1, %g2, %g1
+		andcc			%g1, TSTATE_PRIV, %g0
+		bne,pn			%xcc, etrap_maybe_fpu
+		 sub			%sp, REGWIN_SZ + TRACEREG_SZ - STACK_BIAS, %g2
+		sethi			%hi(TASK_REGOFF), %g2
+
+		or			%g2, %lo(TASK_REGOFF), %g2
+		add			%g6, %g2, %g2
+etrap_maybe_fpu:rd			%fprs, %g3
+		brnz,pn			%g3, etrap_save_fpu
+		 st			%g0, [%g2 + REGWIN_SZ + PT_V9_FPRS]
+etrap_after_fpu:rdpr			%tpc, %g3
+		stx			%g1, [%g2 + REGWIN_SZ + PT_V9_TSTATE]
+		rdpr			%tnpc, %g1
+
+		stx			%g3, [%g2 + REGWIN_SZ + PT_V9_TPC]
+		rd			%y, %g3
+		stx			%g1, [%g2 + REGWIN_SZ + PT_V9_TNPC]
+		st			%g3, [%g2 + REGWIN_SZ + PT_V9_Y]
+		save			%g2, -STACK_BIAS, %sp	! The ordering here is
+		rdpr			%pstate, %g1		! critical, see winfixup
+		bne,pn			%xcc, 2f
+		 rdpr			%canrestore, %g3
+
+		rdpr			%wstate, %g2
+		wrpr			%g0, 7, %cleanwin
+		wrpr			%g0, 0, %canrestore
+		sll			%g2, 3, %g2
+		wrpr			%g3, 0, %otherwin
+		wrpr			%g2, 0, %wstate
+		wr			%g0, ASI_DMMU, %asi
+		ldxa			[%g0 + PRIMARY_CONTEXT] %asi, %g2
+
+		stxa			%g0, [%g0 + PRIMARY_CONTEXT] %asi
+		stxa			%g2, [%g0 + SECONDARY_CONTEXT] %asi
+		flush			%g6
+2:		wrpr			%g0, 0x0, %tl
+		or			%g1, 0, %l1
+		add			%g4, 0, %l4
+		or			%g5, 0, %l5
+		add			%g7, 0, %l2
+
+		or			%g6, 0, %l6
+		wrpr			%l1, (PSTATE_AG|PSTATE_RMO), %pstate
+		stx			%g1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G1]
+		stx			%g2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G2]
+		stx			%g3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G3]
+		stx			%g4, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G4]
+		stx			%g5, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G5]
+		stx			%g6, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G6]
+
+		stx			%g7, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_G7]
+		stx			%i0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0]
+		stx			%i1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I1]
+		stx			%i2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I2]
+		stx			%i3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I3]
+		stx			%i4, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I4]
+		sethi			%uhi(PAGE_OFFSET), %g4
+		stx			%i5, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I5]
+
+		stx			%i6, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I6]
+		sllx			%g4, 32, %g4
+		stx			%i7, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I7]
+		wrpr			%l1, (PSTATE_IE|PSTATE_AG|PSTATE_RMO), %pstate
+		jmpl			%l2 + 0x4, %g0
+		 mov			%l6, %g6
+etrap_save_fpu:	and			%g3, FPRS_FEF, %g3
+		brz,pn			%g3, 2f
+
+		 nop
+		be,a,pt			%xcc, 3f
+		 add			%g2, (TRACEREG_SZ + REGWIN_SZ), %g2
+		wr			%g0, ASI_BLK_P, %asi
+		add			%g2, ((TRACEREG_SZ+REGWIN_SZ)-FPUREG_SZ), %g2
+		andn			%g2, (64 - 1), %g2
+1:		st			%g3, [%g2 - 0x4 /*REGWIN_SZ + PT_V9_FPRS*/]
+		rd			%gsr, %g3
+
+		stx			%fsr, [%g2 + 0x100]
+		stx			%g3,  [%g2 + 0x108]
+		membar			#StoreStore | #LoadStore
+		stda			%f0,  [%g2 + 0x000] %asi
+		stda			%f16, [%g2 + 0x040] %asi
+		stda			%f32, [%g2 + 0x080] %asi
+		stda			%f48, [%g2 + 0x0c0] %asi
+		membar			#Sync
+
+		sub			%g2, (TRACEREG_SZ + REGWIN_SZ), %g2
+2:		b,pt			%xcc, etrap_after_fpu
+		 wr			%g0, 0, %fprs
+3:		/* Because Ultra lacks ASI_BLK_NUCLEUS a hack has to take place. */
+		mov			SECONDARY_CONTEXT, %g3
+		stxa			%g0, [%g3] ASI_DMMU
+		flush			%g2
+		wr			%g0, ASI_BLK_S, %asi
+		nop
+
+		b,pt			%xcc, 1b
+		 mov			FPRS_FEF, %g3
+		nop
+etraptl1:	rdpr			%tstate, %g1
+		sub			%sp, REGWIN_SZ + TRACEREG_SZ - STACK_BIAS, %g2
+		ba,pt			%xcc, etrap_maybe_fpu
+		 andcc			%g1, TSTATE_PRIV, %g0
+		nop
+#undef TASK_REGOFF
+#undef FPUREG_SZ
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov