path: root/arch/alpha/kernel/entry.S

/*
 * arch/alpha/kernel/entry.S
 *
 * Kernel entry-points.
 */

#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
#include <asm/pal.h>
#include <asm/errno.h>
#include <asm/unistd.h>

	.text
	.set noat
	.cfi_sections	.debug_frame

/* Stack offsets.  */
#define SP_OFF			184
#define SWITCH_STACK_SIZE	320

.macro	CFI_START_OSF_FRAME	func
	.align	4
	.globl	\func
	.type	\func,@function
\func:
	.cfi_startproc simple
	.cfi_return_column 64
	.cfi_def_cfa	$sp, 48
	.cfi_rel_offset	64, 8
	.cfi_rel_offset	$gp, 16
	.cfi_rel_offset	$16, 24
	.cfi_rel_offset	$17, 32
	.cfi_rel_offset	$18, 40
.endm

.macro	CFI_END_OSF_FRAME	func
	.cfi_endproc
	.size	\func, . - \func
.endm

/*
 * This defines the normal kernel pt-regs layout.
 *
 * regs 9-15 preserved by C code
 * regs 16-18 saved by PAL-code
 * regs 29-30 saved and set up by PAL-code
 * JRP - Save regs 16-18 in a special area of the stack, so that
 * the palcode-provided values are available to the signal handler.
 */

.macro	SAVE_ALL
	subq	$sp, SP_OFF, $sp
	.cfi_adjust_cfa_offset	SP_OFF
	stq	$0, 0($sp)
	stq	$1, 8($sp)
	stq	$2, 16($sp)
	stq	$3, 24($sp)
	stq	$4, 32($sp)
	stq	$28, 144($sp)
	.cfi_rel_offset	$0, 0
	.cfi_rel_offset $1, 8
	.cfi_rel_offset	$2, 16
	.cfi_rel_offset	$3, 24
	.cfi_rel_offset	$4, 32
	.cfi_rel_offset	$28, 144
	lda	$2, alpha_mv
	stq	$5, 40($sp)
	stq	$6, 48($sp)
	stq	$7, 56($sp)
	stq	$8, 64($sp)
	stq	$19, 72($sp)
	stq	$20, 80($sp)
	stq	$21, 88($sp)
	ldq	$2, HAE_CACHE($2)
	stq	$22, 96($sp)
	stq	$23, 104($sp)
	stq	$24, 112($sp)
	stq	$25, 120($sp)
	stq	$26, 128($sp)
	stq	$27, 136($sp)
	stq	$2, 152($sp)
	stq	$16, 160($sp)
	stq	$17, 168($sp)
	stq	$18, 176($sp)
	.cfi_rel_offset	$5, 40
	.cfi_rel_offset	$6, 48
	.cfi_rel_offset	$7, 56
	.cfi_rel_offset	$8, 64
	.cfi_rel_offset $19, 72
	.cfi_rel_offset	$20, 80
	.cfi_rel_offset	$21, 88
	.cfi_rel_offset $22, 96
	.cfi_rel_offset	$23, 104
	.cfi_rel_offset	$24, 112
	.cfi_rel_offset	$25, 120
	.cfi_rel_offset	$26, 128
	.cfi_rel_offset	$27, 136
.endm

.macro	RESTORE_ALL
	lda	$19, alpha_mv
	ldq	$0, 0($sp)
	ldq	$1, 8($sp)
	ldq	$2, 16($sp)
	ldq	$3, 24($sp)
	ldq	$21, 152($sp)
	ldq	$20, HAE_CACHE($19)
	ldq	$4, 32($sp)
	ldq	$5, 40($sp)
	ldq	$6, 48($sp)
	ldq	$7, 56($sp)
	subq	$20, $21, $20
	ldq	$8, 64($sp)
	beq	$20, 99f
	ldq	$20, HAE_REG($19)
	stq	$21, HAE_CACHE($19)
	stq	$21, 0($20)
99:	ldq	$19, 72($sp)
	ldq	$20, 80($sp)
	ldq	$21, 88($sp)
	ldq	$22, 96($sp)
	ldq	$23, 104($sp)
	ldq	$24, 112($sp)
	ldq	$25, 120($sp)
	ldq	$26, 128($sp)
	ldq	$27, 136($sp)
	ldq	$28, 144($sp)
	addq	$sp, SP_OFF, $sp
	.cfi_restore	$0
	.cfi_restore	$1
	.cfi_restore	$2
	.cfi_restore	$3
	.cfi_restore	$4
	.cfi_restore	$5
	.cfi_restore	$6
	.cfi_restore	$7
	.cfi_restore	$8
	.cfi_restore	$19
	.cfi_restore	$20
	.cfi_restore	$21
	.cfi_restore	$22
	.cfi_restore	$23
	.cfi_restore	$24
	.cfi_restore	$25
	.cfi_restore	$26
	.cfi_restore	$27
	.cfi_restore	$28
	.cfi_adjust_cfa_offset	-SP_OFF
.endm

.macro	DO_SWITCH_STACK
	bsr	$1, do_switch_stack
	.cfi_adjust_cfa_offset	SWITCH_STACK_SIZE
	.cfi_rel_offset	$9, 0
	.cfi_rel_offset	$10, 8
	.cfi_rel_offset	$11, 16
	.cfi_rel_offset	$12, 24
	.cfi_rel_offset	$13, 32
	.cfi_rel_offset	$14, 40
	.cfi_rel_offset	$15, 48
	/* We don't really care about the FP registers for debugging.  */
.endm

.macro	UNDO_SWITCH_STACK
	bsr	$1, undo_switch_stack
	.cfi_restore	$9
	.cfi_restore	$10
	.cfi_restore	$11
	.cfi_restore	$12
	.cfi_restore	$13
	.cfi_restore	$14
	.cfi_restore	$15
	.cfi_adjust_cfa_offset	-SWITCH_STACK_SIZE
.endm

/*
 * Non-syscall kernel entry points.
 */

CFI_START_OSF_FRAME entInt
	SAVE_ALL
	lda	$8, 0x3fff
	lda	$26, ret_from_sys_call
	bic	$sp, $8, $8
	mov	$sp, $19
	jsr	$31, do_entInt
CFI_END_OSF_FRAME entInt

CFI_START_OSF_FRAME entArith
	SAVE_ALL
	lda	$8, 0x3fff
	lda	$26, ret_from_sys_call
	bic