WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/sparc64/src/trap/trap_table.S

+#
 # Copyright (C) 2005 Jakub Jermar
 # All rights reserved.
+#
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
+#
 # - Redistributions of source code must retain the above copyright
 #   notice, this list of conditions and the following disclaimer.
 # - Redistributions in binary form must reproduce the above copyright
 #   notice, this list of conditions and the following disclaimer in the
 #   documentation and/or other materials provided with the distribution.
 # - The name of the author may not be used to endorse or promote products
 #   derived from this software without specific prior written permission.
+#
 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
 /**
  * This file contains two trap tables.
  * First, trap_table, is the one wich contains handlers implemented by
  * kernel. During initialization, these handlers are copied out to
  * the second trap table, trap_table_save, and the first table is
  * overwritten with copy of OFW's own trap table. The copy is then patched
  * from the trap_table_save.
+ *
  * This arrangement is beneficial because kernel handlers stay on their
  * link-time addresses which is good for debugging.
  */
 .register %g2, #scratch
 .register %g3, #scratch
 .register %g6, #scratch
 .register %g7, #scratch
 .text
 #include <arch/trap/trap_table.h>
 #include <arch/trap/regwin.h>
 #include <arch/trap/interrupt.h>
+#include <arch/trap/exception.h>
+#include <arch/stack.h>
 #define TABLE_SIZE	TRAP_TABLE_SIZE
 #define ENTRY_SIZE	TRAP_TABLE_ENTRY_SIZE
 /*
  * Kernel trap table.
  */
 .align TABLE_SIZE
 .global trap_table
 trap_table:
+/* TT = 0x08, TL = 0, instruction_access_exception */
+.org trap_table + TT_INSTRUCTION_ACCESS_EXCEPTION*ENTRY_SIZE
+.global instruction_access_exception
+instruction_access_exception:
+	SIMPLE_HANDLER do_instruction_access_exc
 /* TT = 0x24, TL = 0, clean_window handler */
 .org trap_table + TT_CLEAN_WINDOW*ENTRY_SIZE
 .global clean_window_handler
 clean_window_handler:
 	CLEAN_WINDOW_HANDLER
+/* TT = 0x34, TL = 0, mem_address_not_aligned */
+.org trap_table + TT_MEM_ADDRESS_NOT_ALIGNED*ENTRY_SIZE
+.global mem_address_not_aligned
+mem_address_not_aligned:
+	SIMPLE_HANDLER do_mem_address_not_aligned
 /* TT = 0x41, TL = 0, interrupt_level_1 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_1*ENTRY_SIZE
 .global interrupt_level_1_handler
 interrupt_level_1_handler:
 	INTERRUPT_LEVEL_N_HANDLER 1
 /* TT = 0x42, TL = 0, interrupt_level_2 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_2*ENTRY_SIZE
 .global interrupt_level_2_handler
 interrupt_level_2_handler:
 	INTERRUPT_LEVEL_N_HANDLER 2
 /* TT = 0x43, TL = 0, interrupt_level_3 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_3*ENTRY_SIZE
 .global interrupt_level_3_handler
 interrupt_level_3_handler:
 	INTERRUPT_LEVEL_N_HANDLER 3
 /* TT = 0x44, TL = 0, interrupt_level_4 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_4*ENTRY_SIZE
 .global interrupt_level_4_handler
 interrupt_level_4_handler:
 	INTERRUPT_LEVEL_N_HANDLER 4
 /* TT = 0x45, TL = 0, interrupt_level_5 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_5*ENTRY_SIZE
 .global interrupt_level_5_handler
 interrupt_level_5_handler:
 	INTERRUPT_LEVEL_N_HANDLER 5
 /* TT = 0x46, TL = 0, interrupt_level_6 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_6*ENTRY_SIZE
 .global interrupt_level_6_handler
 interrupt_level_6_handler:
 	INTERRUPT_LEVEL_N_HANDLER 6
 /* TT = 0x47, TL = 0, interrupt_level_7 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_7*ENTRY_SIZE
 .global interrupt_level_7_handler
 interrupt_level_7_handler:
 	INTERRUPT_LEVEL_N_HANDLER 7
 /* TT = 0x48, TL = 0, interrupt_level_8 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_8*ENTRY_SIZE
 .global interrupt_level_8_handler
 interrupt_level_8_handler:
 	INTERRUPT_LEVEL_N_HANDLER 8
 /* TT = 0x49, TL = 0, interrupt_level_9 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_9*ENTRY_SIZE
 .global interrupt_level_9_handler
 interrupt_level_9_handler:
 	INTERRUPT_LEVEL_N_HANDLER 9
 /* TT = 0x4a, TL = 0, interrupt_level_10 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_10*ENTRY_SIZE
 .global interrupt_level_10_handler
 interrupt_level_10_handler:
 	INTERRUPT_LEVEL_N_HANDLER 10
 /* TT = 0x4b, TL = 0, interrupt_level_11 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_11*ENTRY_SIZE
 .global interrupt_level_11_handler
 interrupt_level_11_handler:
 	INTERRUPT_LEVEL_N_HANDLER 11
 /* TT = 0x4c, TL = 0, interrupt_level_12 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_12*ENTRY_SIZE
 .global interrupt_level_12_handler
 interrupt_level_12_handler:
 	INTERRUPT_LEVEL_N_HANDLER 12
 /* TT = 0x4d, TL = 0, interrupt_level_13 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_13*ENTRY_SIZE
 .global interrupt_level_13_handler
 interrupt_level_13_handler:
 	INTERRUPT_LEVEL_N_HANDLER 13
 /* TT = 0x4e, TL = 0, interrupt_level_14 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_14*ENTRY_SIZE
 .global interrupt_level_14_handler
 interrupt_level_14_handler:
 	INTERRUPT_LEVEL_N_HANDLER 14
 /* TT = 0x4f, TL = 0, interrupt_level_15 handler */
 .org trap_table + TT_INTERRUPT_LEVEL_15*ENTRY_SIZE
 .global interrupt_level_15_handler
 interrupt_level_15_handler:
 	INTERRUPT_LEVEL_N_HANDLER 15
 /* TT = 0x60, TL = 0, interrupt_vector_trap handler */
 .org trap_table + TT_INTERRUPT_VECTOR_TRAP*ENTRY_SIZE
 .global interrupt_vector_trap_handler
 interrupt_vector_trap_handler:
 	INTERRUPT_VECTOR_TRAP_HANDLER
 /* TT = 0x80, TL = 0, spill_0_normal handler */
 .org trap_table + TT_SPILL_0_NORMAL*ENTRY_SIZE
 .global spill_0_normal
 spill_0_normal:
 	SPILL_NORMAL_HANDLER
 /* TT = 0xc0, TL = 0, fill_0_normal handler */
 .org trap_table + TT_FILL_0_NORMAL*ENTRY_SIZE
 .global fill_0_normal
 fill_0_normal:
 	FILL_NORMAL_HANDLER
 /*
  * Handlers for TL>0.
  */
+/* TT = 0x08, TL > 0, instruction_access_exception */
+.org trap_table + (TT_INSTRUCTION_ACCESS_EXCEPTION+512)*ENTRY_SIZE
+.global instruction_access_exception_high
+instruction_access_exception_high:
+	SIMPLE_HANDLER do_instruction_access_exc
 /* TT = 0x24, TL > 0, clean_window handler */
 .org trap_table + (TT_CLEAN_WINDOW+512)*ENTRY_SIZE
 .global clean_window_handler_high
 clean_window_handler_high:
 	CLEAN_WINDOW_HANDLER
+/* TT = 0x34, TL > 0, mem_address_not_aligned */
+.org trap_table + (TT_MEM_ADDRESS_NOT_ALIGNED+512)*ENTRY_SIZE
+.global mem_address_not_aligned_high
+mem_address_not_aligned_high:
+	SIMPLE_HANDLER do_mem_address_not_aligned
 /* TT = 0x80, TL > 0, spill_0_normal handler */
 .org trap_table + (TT_SPILL_0_NORMAL+512)*ENTRY_SIZE
 .global spill_0_normal_high
 spill_0_normal_high:
 	SPILL_NORMAL_HANDLER
 /* TT = 0xc0, TL > 0, fill_0_normal handler */
 .org trap_table + (TT_FILL_0_NORMAL+512)*ENTRY_SIZE
 .global fill_0_normal_high
 fill_0_normal_high:
 	FILL_NORMAL_HANDLER
 /*
  * Save trap table.
  */
 .align TABLE_SIZE
 .global trap_table_save
 trap_table_save:
 	.space TABLE_SIZE, 0
+/* Preemptible trap handler.
+ *
+ * This trap handler makes arrangements to
+ * make calling scheduler() possible.
+ *
-/* Trap handler that explicitly saves global registers.
+ * The caller is responsible for doing save
+ * and allocating PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE
+ * bytes on stack.
+ *
  * Input registers:
  * 	%l0	 	Address of function to call.
  * Output registers:
  *	 %l1 - %l7 	Copy of %g1 - %g7
  */
-.global saving_handler
+.global preemptible_handler
-saving_handler:
+preemptible_handler:
+	/*
+	 * Save TSTATE, TPC, TNPC and PSTATE aside.
+	 */
+	rdpr %tstate, %g1
+	rdpr %tpc, %g2
+	rdpr %tnpc, %g3
+	rdpr %pstate, %g4
+	stx %g1, [%fp + STACK_BIAS + SAVED_TSTATE]
+	stx %g2, [%fp + STACK_BIAS + SAVED_TPC]
+	stx %g3, [%fp + STACK_BIAS + SAVED_TNPC]
+	stx %g4, [%fp + STACK_BIAS + SAVED_PSTATE]
+	/*
+	 * Write 0 to TL.
+	 */
+	wrpr %g0, 0, %tl
+	/*
+	 * Alter PSTATE.
+	 * - switch to normal globals.
+	 */
+	and %g4, ~1, %g4		! mask alternate globals
+	wrpr %g4, 0, %pstate
+	/*
+	 * Save the normal globals.
+	 */
 	SAVE_GLOBALS
+	/*
+	 * Call the higher-level handler.
+	 */
 	call %l0
 	nop
+	/*
+	 * Restore the normal global register set.
+	 */
 	RESTORE_GLOBALS
+	/*
+	 * Restore PSTATE from saved copy.
+	 * Alternate globals become active.
+	 */
+	ldx [%fp + STACK_BIAS + SAVED_PSTATE], %l4
+	wrpr %l4, 0, %pstate
+	/*
+	 * Write 1 to TL.
+	 */
+	wrpr %g0, 1, %tl
+	/*
+	 * Read TSTATE, TPC and TNPC from saved copy.
+	 */
+	ldx [%fp + STACK_BIAS + SAVED_TSTATE], %g1
+	ldx [%fp + STACK_BIAS + SAVED_TPC], %g2
+	ldx [%fp + STACK_BIAS + SAVED_TNPC], %g3
+	/*
-	restore		/* matches the save instruction from the top-level handler */
+	 * Do restore to match the save instruction from the top-level handler.
+	 */
+	restore
+	/*
+	 * On execution of retry instruction, CWP will be restored from TSTATE register.
+	 * However, because of scheduling, it is possible that CWP in saved TSTATE
+	 * is different from current CWP. The following chunk of code fixes CWP
+	 * in the saved copy of TSTATE.
+	 */
+	rdpr %cwp, %g4		! read current CWP
+	and %g1, ~0x1f, %g1	! clear CWP field in saved TSTATE
+	or %g1, %g4, %g1	! write current CWP to TSTATE
+	/*
+	 * Restore TSTATE, TPC and TNPC from saved copies.
+	 */
+	wrpr %g1, 0, %tstate
+	wrpr %g2, 0, %tpc
+	wrpr %g3, 0, %tnpc
+	/*
+	 * Return from interrupt.
+	 */
 	retry

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/sparc64/src/trap/trap_table.S – Rev 666 → 667