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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/loongarch/kernel/entry.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited

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 *

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 * Derived from MIPS:

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 * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle

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 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.

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 * Copyright (C) 2001 MIPS Technologies, Inc.

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 */

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#include <asm/asm.h>

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#include <asm/asmmacro.h>

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#include <asm/loongarch.h>

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#include <asm/regdef.h>

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#include <asm/stackframe.h>

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#include <asm/thread_info.h>

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#include <asm/unwind_hints.h>

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	.text

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	.cfi_sections	.debug_frame

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	.align	5

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SYM_CODE_START(handle_syscall)

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	UNWIND_HINT_UNDEFINED

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	csrrd		t0, PERCPU_BASE_KS

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	la.pcrel	t1, kernelsp

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	add.d		t1, t1, t0

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	move		t2, sp

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	ld.d		sp, t1, 0

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	addi.d		sp, sp, -PT_SIZE

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	cfi_st		t2, PT_R3

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	cfi_rel_offset	sp, PT_R3

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	st.d		zero, sp, PT_R0

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	csrrd		t2, LOONGARCH_CSR_PRMD

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	st.d		t2, sp, PT_PRMD

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	csrrd		t2, LOONGARCH_CSR_CRMD

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	st.d		t2, sp, PT_CRMD

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	csrrd		t2, LOONGARCH_CSR_EUEN

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	st.d		t2, sp, PT_EUEN

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	csrrd		t2, LOONGARCH_CSR_ECFG

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	st.d		t2, sp, PT_ECFG

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	csrrd		t2, LOONGARCH_CSR_ESTAT

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	st.d		t2, sp, PT_ESTAT

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	cfi_st		ra, PT_R1

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	cfi_st		a0, PT_R4

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	cfi_st		a1, PT_R5

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	cfi_st		a2, PT_R6

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	cfi_st		a3, PT_R7

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	cfi_st		a4, PT_R8

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	cfi_st		a5, PT_R9

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	cfi_st		a6, PT_R10

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	cfi_st		a7, PT_R11

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	csrrd		ra, LOONGARCH_CSR_ERA

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	st.d		ra, sp, PT_ERA

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	cfi_rel_offset	ra, PT_ERA

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	cfi_st		tp, PT_R2

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	cfi_st		u0, PT_R21

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	cfi_st		fp, PT_R22

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	SAVE_STATIC

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	UNWIND_HINT_REGS

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#ifdef CONFIG_KGDB

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	li.w		t1, CSR_CRMD_WE

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	csrxchg		t1, t1, LOONGARCH_CSR_CRMD

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#endif

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	move		u0, t0

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	li.d		tp, ~_THREAD_MASK

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	and		tp, tp, sp

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	move		a0, sp

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	bl		do_syscall

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	STACKLEAK_ERASE

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	RESTORE_ALL_AND_RET

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SYM_CODE_END(handle_syscall)

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_ASM_NOKPROBE(handle_syscall)

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SYM_CODE_START(ret_from_fork_asm)

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	UNWIND_HINT_REGS

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	move		a1, sp

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	bl 		ret_from_fork

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	STACKLEAK_ERASE

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	RESTORE_STATIC

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	RESTORE_SOME

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	RESTORE_SP_AND_RET

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SYM_CODE_END(ret_from_fork_asm)

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SYM_CODE_START(ret_from_kernel_thread_asm)

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	UNWIND_HINT_REGS

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	move		a1, sp

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	move		a2, s0

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	move		a3, s1

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	bl		ret_from_kernel_thread

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	STACKLEAK_ERASE

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	RESTORE_STATIC

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	RESTORE_SOME

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	RESTORE_SP_AND_RET

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SYM_CODE_END(ret_from_kernel_thread_asm)

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