| entry-armv.S (4e918ab13eaf40f19938659cb5a22c93172778a8) | entry-armv.S (7b9896c352073156a325c3bb0dc4c46e06e2a468) |
|---|---|
| 1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * linux/arch/arm/kernel/entry-armv.S 4 * 5 * Copyright (C) 1996,1997,1998 Russell King. 6 * ARM700 fix by Matthew Godbolt (linux-user@willothewisp.demon.co.uk) 7 * nommu support by Hyok S. Choi (hyok.choi@samsung.com) 8 * --- 21 unchanged lines hidden (view full) --- 30#include <asm/probes.h> 31 32/* 33 * Interrupt handling. 34 */ 35 .macro irq_handler, from_user:req 36 mov r0, sp 37#ifdef CONFIG_IRQSTACKS | 1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * linux/arch/arm/kernel/entry-armv.S 4 * 5 * Copyright (C) 1996,1997,1998 Russell King. 6 * ARM700 fix by Matthew Godbolt (linux-user@willothewisp.demon.co.uk) 7 * nommu support by Hyok S. Choi (hyok.choi@samsung.com) 8 * --- 21 unchanged lines hidden (view full) --- 30#include <asm/probes.h> 31 32/* 33 * Interrupt handling. 34 */ 35 .macro irq_handler, from_user:req 36 mov r0, sp 37#ifdef CONFIG_IRQSTACKS |
| 38 mov_l r2, irq_stack_ptr @ Take base address 39 mrc p15, 0, r3, c13, c0, 4 @ Get CPU offset | |
| 40#ifdef CONFIG_UNWINDER_ARM 41 mov fpreg, sp @ Preserve original SP 42#else 43 mov r8, fp @ Preserve original FP 44 mov r9, sp @ Preserve original SP 45#endif | 38#ifdef CONFIG_UNWINDER_ARM 39 mov fpreg, sp @ Preserve original SP 40#else 41 mov r8, fp @ Preserve original FP 42 mov r9, sp @ Preserve original SP 43#endif |
| 46 ldr sp, [r2, r3] @ Load SP from per-CPU var | 44 ldr_this_cpu sp, irq_stack_ptr, r2, r3 45 |
| 47 .if \from_user == 0 48UNWIND( .setfp fpreg, sp ) 49 @ 50 @ If we took the interrupt while running in the kernel, we may already 51 @ be using the IRQ stack, so revert to the original value in that case. 52 @ 53 subs r2, sp, r0 @ SP above bottom of IRQ stack? 54 rsbscs r2, r2, #THREAD_SIZE @ ... and below the top? --- 816 unchanged lines hidden (view full) --- 871 @ relocations. As these are ARM only, switch to ARM mode first. 872 @ 873 @ We enter here with IP clobbered and its value stashed on the mode 874 @ stack. 875 @ 876THUMB( bx pc ) 877THUMB( nop ) 878THUMB( .arm ) | 46 .if \from_user == 0 47UNWIND( .setfp fpreg, sp ) 48 @ 49 @ If we took the interrupt while running in the kernel, we may already 50 @ be using the IRQ stack, so revert to the original value in that case. 51 @ 52 subs r2, sp, r0 @ SP above bottom of IRQ stack? 53 rsbscs r2, r2, #THREAD_SIZE @ ... and below the top? --- 816 unchanged lines hidden (view full) --- 870 @ relocations. As these are ARM only, switch to ARM mode first. 871 @ 872 @ We enter here with IP clobbered and its value stashed on the mode 873 @ stack. 874 @ 875THUMB( bx pc ) 876THUMB( nop ) 877THUMB( .arm ) |
| 879 mrc p15, 0, ip, c13, c0, 4 @ Get per-CPU offset | 878 ldr_this_cpu_armv6 ip, overflow_stack_ptr |
| 880 | 879 |
| 881 .globl overflow_stack_ptr 882 .reloc 0f, R_ARM_ALU_PC_G0_NC, overflow_stack_ptr 883 .reloc 1f, R_ARM_ALU_PC_G1_NC, overflow_stack_ptr 884 .reloc 2f, R_ARM_LDR_PC_G2, overflow_stack_ptr 885 add ip, ip, pc 8860: add ip, ip, #-4 8871: add ip, ip, #0 8882: ldr ip, [ip, #4] 889 | |
| 890 str sp, [ip, #-4]! @ Preserve original SP value 891 mov sp, ip @ Switch to overflow stack 892 pop {ip} @ Original SP in IP 893 894#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC) 895 mov ip, ip @ mov expected by unwinder 896 push {fp, ip, lr, pc} @ GCC flavor frame record 897#else --- 441 unchanged lines hidden --- | 880 str sp, [ip, #-4]! @ Preserve original SP value 881 mov sp, ip @ Switch to overflow stack 882 pop {ip} @ Original SP in IP 883 884#if defined(CONFIG_UNWINDER_FRAME_POINTER) && defined(CONFIG_CC_IS_GCC) 885 mov ip, ip @ mov expected by unwinder 886 push {fp, ip, lr, pc} @ GCC flavor frame record 887#else --- 441 unchanged lines hidden --- |