arm/kernel/entry-common.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  *  linux/arch/arm/kernel/entry-common.S
14 #include <asm/unistd-oabi.h>
19 #include "entry-header.S"
37  * have tracing, context tracking and rseq debug disabled - the overheads
45 	ldr	r1, [tsk, #TI_FLAGS]		@ re-check for syscall tracing
75 	ldr	r1, [tsk, #TI_FLAGS]		@ re-check for syscall tracing
81 	/* Slower path - fall through to work_pending */
92 	movlt	scno, #(__NR_restart_syscall - __NR_SYSCALL_BASE)
94 	ldmia	sp, {r0 - r6}			@ have to reload r0 - r6
141  *-----------------------------------------------------------------------------
147 	sub	sp, sp, #PT_REGS_SIZE
148 	stmia	sp, {r0 - r12}
160 	sub	sp, sp, #PT_REGS_SIZE
161 	stmia	sp, {r0 - r12}
172 	sub	sp, sp, #PT_REGS_SIZE
173 	stmia	sp, {r0 - r12}			@ Calling r0 - r12
179 	mrs	saved_psr, spsr			@ called from non-FIQ mode, so ok.
205  USER(	ldreq	r10, [saved_pc, #-4]	)	@ get SWI instruction
207  USER(	ldr	r10, [saved_pc, #-4]	)	@ get SWI instruction
220  USER(	ldreq	scno, [saved_pc, #-4]	)
224  USER(	ldr	scno, [saved_pc, #-4]	)	@ get SWI instruction
247 	bic	scno, scno, #0xff000000		@ mask off SWI op-code
257  TRACE(	ldmia	sp, {r0 - r3}		)
269 2:	cmp	scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
279 	 * position to return -EFAULT. Instead, return back to the
280 	 * instruction and re-enter the user fault handling path trying
285 	sub	lr, saved_pc, #4
302 	cmp	scno, #-1			@ skip the syscall?
325 	.ifgt	__sys_nr - \nr
328 	.rept	\nr - __sys_nr
336 	.ifgt	__sys_nr - __NR_syscalls
339 	.rept	__NR_syscalls - __sys_nr
342 	.size	\sym, . - \sym
354 #include <calls-eabi.S>
356 #include <calls-oabi.S>
367 		cmp	scno, #__NR_syscall - __NR_SYSCALL_BASE
407  * Note: off_4k (r5) is always units of 4K.  If we can't do the requested
457 #include <calls-oabi.S>