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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/parisc/kernel/toc_asm.S
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/* TOC (Transfer of Control) handler. */

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	.level 1.1

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#include <asm/assembly.h>

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#include <linux/threads.h>

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#include <linux/linkage.h>

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	.text

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	.import toc_intr,code

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	.import toc_stack,data

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	.align 16

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ENTRY_CFI(toc_handler)

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	load32	PA(toc_stack),%sp

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#ifdef CONFIG_SMP

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	/* get per-cpu toc_stack address. */

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	mfctl   %cr30, %r1

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	tophys  %r1,%r2			/* task_struct */

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	LDREG   TASK_TI_CPU(%r2),%r4	/* cpu */

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	load32	PA(__per_cpu_offset),%r1

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	LDREGX  %r4(%r1),%r4

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	add	%r4,%sp,%sp

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#endif

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	/*

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	 * setup pt_regs on stack and save the

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	 * floating point registers. PIM_TOC doesn't

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	 * save fp registers, so we're doing it here.

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	 */

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	copy	%sp,%arg0

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	ldo	PT_SZ_ALGN(%sp), %sp

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	/* clear pt_regs */

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	copy	%arg0,%r1

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0:	cmpb,<<,n %r1,%sp,0b

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	stw,ma	%r0,4(%r1)

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	ldo	PT_FR0(%arg0),%r25

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	save_fp	%r25

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	/* go virtual */

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	load32	PA(swapper_pg_dir),%r4

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	mtctl	%r4,%cr24

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	mtctl	%r4,%cr25

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	/* Clear sr4-sr7 */

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	mtsp	%r0, %sr4

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	mtsp	%r0, %sr5

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	mtsp	%r0, %sr6

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	mtsp	%r0, %sr7

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	tovirt_r1 %sp

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	tovirt_r1 %arg0

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	virt_map

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	loadgp

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#ifdef CONFIG_64BIT

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	ldo	-16(%sp),%r29

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#endif

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	load32	toc_intr,%r1

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	be	0(%sr7,%r1)

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	nop

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ENDPROC_CFI(toc_handler)

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	/*

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	 * keep this checksum here, as it is part of the toc_handler

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	 * spanned by toc_handler_size (all words in toc_handler are

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	 * added in PDC and the sum must equal to zero.

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	 */

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SYM_DATA(toc_handler_csum, .long 0)

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SYM_DATA(toc_handler_size, .long . - toc_handler)

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