1d2912cb1SThomas Gleixner/* SPDX-License-Identifier: GPL-2.0-only */ 21da177e4SLinus Torvalds/* 31da177e4SLinus Torvalds * linux/arch/arm/kernel/entry-common.S 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 2000 Russell King 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds 86ebbf2ceSRussell King#include <asm/assembler.h> 91da177e4SLinus Torvalds#include <asm/unistd.h> 10395a59d0SAbhishek Sagar#include <asm/ftrace.h> 11c4c5716eSCatalin Marinas#include <asm/unwind.h> 12e33f8d32SThomas Garnier#include <asm/memory.h> 1396a8fae0SRussell King#ifdef CONFIG_AEABI 1496a8fae0SRussell King#include <asm/unistd-oabi.h> 1596a8fae0SRussell King#endif 1696a8fae0SRussell King 1796a8fae0SRussell King .equ NR_syscalls, __NR_syscalls 181da177e4SLinus Torvalds 1913a5045dSRob Herring#ifdef CONFIG_NEED_RET_TO_USER 2013a5045dSRob Herring#include <mach/entry-macro.S> 2113a5045dSRob Herring#else 2213a5045dSRob Herring .macro arch_ret_to_user, tmp1, tmp2 2313a5045dSRob Herring .endm 2413a5045dSRob Herring#endif 2513a5045dSRob Herring 261da177e4SLinus Torvalds#include "entry-header.S" 271da177e4SLinus Torvalds 28309ee042SRussell Kingsaved_psr .req r8 29fcea4523SRussell King#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING) 30fcea4523SRussell Kingsaved_pc .req r9 31fcea4523SRussell King#define TRACE(x...) x 32fcea4523SRussell King#else 33309ee042SRussell Kingsaved_pc .req lr 34fcea4523SRussell King#define TRACE(x...) 35fcea4523SRussell King#endif 361da177e4SLinus Torvalds 37c6089061SRussell King .section .entry.text,"ax",%progbits 381da177e4SLinus Torvalds .align 5 39b74406f3SMathieu Desnoyers#if !(IS_ENABLED(CONFIG_TRACE_IRQFLAGS) || IS_ENABLED(CONFIG_CONTEXT_TRACKING) || \ 40b74406f3SMathieu Desnoyers IS_ENABLED(CONFIG_DEBUG_RSEQ)) 411da177e4SLinus Torvalds/* 423302caddSRussell King * This is the fast syscall return path. We do as little as possible here, 433302caddSRussell King * such as avoiding writing r0 to the stack. We only use this path if we 44b74406f3SMathieu Desnoyers * have tracing, context tracking and rseq debug disabled - the overheads 45b74406f3SMathieu Desnoyers * from those features make this path too inefficient. 461da177e4SLinus Torvalds */ 471da177e4SLinus Torvaldsret_fast_syscall: 48afc9f65eSVincent Whitchurch__ret_fast_syscall: 49c4c5716eSCatalin Marinas UNWIND(.fnstart ) 50c4c5716eSCatalin Marinas UNWIND(.cantunwind ) 513302caddSRussell King disable_irq_notrace @ disable interrupts 521b979372SRussell King ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing 5332d59773SJens Axboe movs r1, r1, lsl #16 541da177e4SLinus Torvalds bne fast_work_pending 55f4dc9a4cSRussell King 56e33f8d32SThomas Garnier 57f80dff9dSDan Williams /* perform architecture specific actions before user return */ 58f80dff9dSDan Williams arch_ret_to_user r1, lr 59f80dff9dSDan Williams 60b86040a5SCatalin Marinas restore_user_regs fast = 1, offset = S_OFF 61c4c5716eSCatalin Marinas UNWIND(.fnend ) 623302caddSRussell KingENDPROC(ret_fast_syscall) 631da177e4SLinus Torvalds 643302caddSRussell King /* Ok, we need to do extra processing, enter the slow path. */ 651da177e4SLinus Torvaldsfast_work_pending: 661da177e4SLinus Torvalds str r0, [sp, #S_R0+S_OFF]! @ returned r0 673302caddSRussell King /* fall through to work_pending */ 683302caddSRussell King#else 693302caddSRussell King/* 70b74406f3SMathieu Desnoyers * The "replacement" ret_fast_syscall for when tracing, context tracking, 71b74406f3SMathieu Desnoyers * or rseq debug is enabled. As we will need to call out to some C functions, 72b74406f3SMathieu Desnoyers * we save r0 first to avoid needing to save registers around each C function 73b74406f3SMathieu Desnoyers * call. 743302caddSRussell King */ 753302caddSRussell Kingret_fast_syscall: 76afc9f65eSVincent Whitchurch__ret_fast_syscall: 773302caddSRussell King UNWIND(.fnstart ) 783302caddSRussell King UNWIND(.cantunwind ) 793302caddSRussell King str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 80b74406f3SMathieu Desnoyers#if IS_ENABLED(CONFIG_DEBUG_RSEQ) 81b74406f3SMathieu Desnoyers /* do_rseq_syscall needs interrupts enabled. */ 82b74406f3SMathieu Desnoyers mov r0, sp @ 'regs' 83b74406f3SMathieu Desnoyers bl do_rseq_syscall 84b74406f3SMathieu Desnoyers#endif 853302caddSRussell King disable_irq_notrace @ disable interrupts 863302caddSRussell King ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing 8732d59773SJens Axboe movs r1, r1, lsl #16 883302caddSRussell King beq no_work_pending 893302caddSRussell King UNWIND(.fnend ) 903302caddSRussell KingENDPROC(ret_fast_syscall) 913302caddSRussell King 923302caddSRussell King /* Slower path - fall through to work_pending */ 933302caddSRussell King#endif 943302caddSRussell King 953302caddSRussell King tst r1, #_TIF_SYSCALL_WORK 963302caddSRussell King bne __sys_trace_return_nosave 973302caddSRussell Kingslow_work_pending: 981da177e4SLinus Torvalds mov r0, sp @ 'regs' 991da177e4SLinus Torvalds mov r2, why @ 'syscall' 1000a267fa6SAl Viro bl do_work_pending 10166285217SAl Viro cmp r0, #0 10281783786SAl Viro beq no_work_pending 10366285217SAl Viro movlt scno, #(__NR_restart_syscall - __NR_SYSCALL_BASE) 10481783786SAl Viro ldmia sp, {r0 - r6} @ have to reload r0 - r6 10581783786SAl Viro b local_restart @ ... and off we go 106e83dd377SDrew RichardsonENDPROC(ret_fast_syscall) 10781783786SAl Viro 1081da177e4SLinus Torvalds/* 1091da177e4SLinus Torvalds * "slow" syscall return path. "why" tells us if this was a real syscall. 1103302caddSRussell King * IRQs may be enabled here, so always disable them. Note that we use the 1113302caddSRussell King * "notrace" version to avoid calling into the tracing code unnecessarily. 1123302caddSRussell King * do_work_pending() will update this state if necessary. 1131da177e4SLinus Torvalds */ 1141da177e4SLinus TorvaldsENTRY(ret_to_user) 1151da177e4SLinus Torvaldsret_slow_syscall: 116b74406f3SMathieu Desnoyers#if IS_ENABLED(CONFIG_DEBUG_RSEQ) 117b74406f3SMathieu Desnoyers /* do_rseq_syscall needs interrupts enabled. */ 118b74406f3SMathieu Desnoyers enable_irq_notrace @ enable interrupts 119b74406f3SMathieu Desnoyers mov r0, sp @ 'regs' 120b74406f3SMathieu Desnoyers bl do_rseq_syscall 121b74406f3SMathieu Desnoyers#endif 1223302caddSRussell King disable_irq_notrace @ disable interrupts 1239fc2552aSMing LeiENTRY(ret_to_user_from_irq) 1241da177e4SLinus Torvalds ldr r1, [tsk, #TI_FLAGS] 12532d59773SJens Axboe movs r1, r1, lsl #16 1263302caddSRussell King bne slow_work_pending 1271da177e4SLinus Torvaldsno_work_pending: 1283302caddSRussell King asm_trace_hardirqs_on save = 0 129651e9499SRussell King 130f80dff9dSDan Williams /* perform architecture specific actions before user return */ 131f80dff9dSDan Williams arch_ret_to_user r1, lr 132b0088480SKevin Hilman ct_user_enter save = 0 133f80dff9dSDan Williams 134b86040a5SCatalin Marinas restore_user_regs fast = 0, offset = 0 1359fc2552aSMing LeiENDPROC(ret_to_user_from_irq) 13693ed3970SCatalin MarinasENDPROC(ret_to_user) 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds/* 1391da177e4SLinus Torvalds * This is how we return from a fork. 1401da177e4SLinus Torvalds */ 1411da177e4SLinus TorvaldsENTRY(ret_from_fork) 1421da177e4SLinus Torvalds bl schedule_tail 1439fff2fa0SAl Viro cmp r5, #0 1449fff2fa0SAl Viro movne r0, r4 14514327c66SRussell King badrne lr, 1f 1466ebbf2ceSRussell King retne r5 14768687c84SRussell King1: get_thread_info tsk 1481da177e4SLinus Torvalds b ret_slow_syscall 14993ed3970SCatalin MarinasENDPROC(ret_from_fork) 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds/*============================================================================= 1521da177e4SLinus Torvalds * SWI handler 1531da177e4SLinus Torvalds *----------------------------------------------------------------------------- 1541da177e4SLinus Torvalds */ 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds .align 5 1571da177e4SLinus TorvaldsENTRY(vector_swi) 15819c4d593SUwe Kleine-König#ifdef CONFIG_CPU_V7M 15919c4d593SUwe Kleine-König v7m_exception_entry 16019c4d593SUwe Kleine-König#else 1615745eef6SRussell King sub sp, sp, #PT_REGS_SIZE 162f4dc9a4cSRussell King stmia sp, {r0 - r12} @ Calling r0 - r12 163b86040a5SCatalin Marinas ARM( add r8, sp, #S_PC ) 164b86040a5SCatalin Marinas ARM( stmdb r8, {sp, lr}^ ) @ Calling sp, lr 165b86040a5SCatalin Marinas THUMB( mov r8, sp ) 166b86040a5SCatalin Marinas THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr 167309ee042SRussell King mrs saved_psr, spsr @ called from non-FIQ mode, so ok. 168fcea4523SRussell King TRACE( mov saved_pc, lr ) 169309ee042SRussell King str saved_pc, [sp, #S_PC] @ Save calling PC 170309ee042SRussell King str saved_psr, [sp, #S_PSR] @ Save CPSR 171f4dc9a4cSRussell King str r0, [sp, #S_OLD_R0] @ Save OLD_R0 17219c4d593SUwe Kleine-König#endif 173*50596b75SArd Biesheuvel reload_current r10, ip 1741da177e4SLinus Torvalds zero_fp 175195b58adSRussell King alignment_trap r10, ip, __cr_alignment 176dca778c5SRussell King asm_trace_hardirqs_on save=0 177dca778c5SRussell King enable_irq_notrace 178dca778c5SRussell King ct_user_exit save=0 1791aa2b3b7SWill Deacon 180e0f9f4a6SRussell King /* 181e0f9f4a6SRussell King * Get the system call number. 182e0f9f4a6SRussell King */ 1833f2829a3SNicolas Pitre 184dd35afc2SNicolas Pitre#if defined(CONFIG_OABI_COMPAT) 1853f2829a3SNicolas Pitre 186dd35afc2SNicolas Pitre /* 187dd35afc2SNicolas Pitre * If we have CONFIG_OABI_COMPAT then we need to look at the swi 188dd35afc2SNicolas Pitre * value to determine if it is an EABI or an old ABI call. 189dd35afc2SNicolas Pitre */ 190dd35afc2SNicolas Pitre#ifdef CONFIG_ARM_THUMB 191309ee042SRussell King tst saved_psr, #PSR_T_BIT 192dd35afc2SNicolas Pitre movne r10, #0 @ no thumb OABI emulation 193309ee042SRussell King USER( ldreq r10, [saved_pc, #-4] ) @ get SWI instruction 194dd35afc2SNicolas Pitre#else 195309ee042SRussell King USER( ldr r10, [saved_pc, #-4] ) @ get SWI instruction 196dd35afc2SNicolas Pitre#endif 197457c2403SBen Dooks ARM_BE8(rev r10, r10) @ little endian instruction 198dd35afc2SNicolas Pitre 199dd35afc2SNicolas Pitre#elif defined(CONFIG_AEABI) 200dd35afc2SNicolas Pitre 201dd35afc2SNicolas Pitre /* 202dd35afc2SNicolas Pitre * Pure EABI user space always put syscall number into scno (r7). 203dd35afc2SNicolas Pitre */ 2043f2829a3SNicolas Pitre#elif defined(CONFIG_ARM_THUMB) 205dd35afc2SNicolas Pitre /* Legacy ABI only, possibly thumb mode. */ 206309ee042SRussell King tst saved_psr, #PSR_T_BIT @ this is SPSR from save_user_regs 207e0f9f4a6SRussell King addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in 208309ee042SRussell King USER( ldreq scno, [saved_pc, #-4] ) 209dd35afc2SNicolas Pitre 210e0f9f4a6SRussell King#else 211dd35afc2SNicolas Pitre /* Legacy ABI only. */ 212309ee042SRussell King USER( ldr scno, [saved_pc, #-4] ) @ get SWI instruction 213e0f9f4a6SRussell King#endif 2141da177e4SLinus Torvalds 215309ee042SRussell King /* saved_psr and saved_pc are now dead */ 216309ee042SRussell King 2172190fed6SRussell King uaccess_disable tbl 2184e57a4ddSArnd Bergmann get_thread_info tsk 2192190fed6SRussell King 220dd35afc2SNicolas Pitre adr tbl, sys_call_table @ load syscall table pointer 221dd35afc2SNicolas Pitre 222dd35afc2SNicolas Pitre#if defined(CONFIG_OABI_COMPAT) 223dd35afc2SNicolas Pitre /* 224dd35afc2SNicolas Pitre * If the swi argument is zero, this is an EABI call and we do nothing. 225dd35afc2SNicolas Pitre * 226dd35afc2SNicolas Pitre * If this is an old ABI call, get the syscall number into scno and 227dd35afc2SNicolas Pitre * get the old ABI syscall table address. 228dd35afc2SNicolas Pitre */ 229dd35afc2SNicolas Pitre bics r10, r10, #0xff000000 2304e57a4ddSArnd Bergmann strne r10, [tsk, #TI_ABI_SYSCALL] 2314e57a4ddSArnd Bergmann streq scno, [tsk, #TI_ABI_SYSCALL] 232dd35afc2SNicolas Pitre eorne scno, r10, #__NR_OABI_SYSCALL_BASE 233dd35afc2SNicolas Pitre ldrne tbl, =sys_oabi_call_table 234dd35afc2SNicolas Pitre#elif !defined(CONFIG_AEABI) 2351da177e4SLinus Torvalds bic scno, scno, #0xff000000 @ mask off SWI op-code 2364e57a4ddSArnd Bergmann str scno, [tsk, #TI_ABI_SYSCALL] 237e0f9f4a6SRussell King eor scno, scno, #__NR_SYSCALL_BASE @ check OS number 2384e57a4ddSArnd Bergmann#else 2394e57a4ddSArnd Bergmann str scno, [tsk, #TI_ABI_SYSCALL] 2403f2829a3SNicolas Pitre#endif 241dca778c5SRussell King /* 242dca778c5SRussell King * Reload the registers that may have been corrupted on entry to 243dca778c5SRussell King * the syscall assembly (by tracing or context tracking.) 244dca778c5SRussell King */ 245dca778c5SRussell King TRACE( ldmia sp, {r0 - r3} ) 246dd35afc2SNicolas Pitre 24781783786SAl Virolocal_restart: 24870c70d97SNicolas Pitre ldr r10, [tsk, #TI_FLAGS] @ check for syscall tracing 2493f2829a3SNicolas Pitre stmdb sp!, {r4, r5} @ push fifth and sixth args 25070c70d97SNicolas Pitre 25129ef73b7SNathaniel Husted tst r10, #_TIF_SYSCALL_WORK @ are we tracing syscalls? 2521da177e4SLinus Torvalds bne __sys_trace 2531da177e4SLinus Torvalds 254afc9f65eSVincent Whitchurch invoke_syscall tbl, scno, r10, __ret_fast_syscall 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds add r1, sp, #S_OFF 257d95bc250SWill Deacon2: cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE) 258e0f9f4a6SRussell King eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back 2591da177e4SLinus Torvalds bcs arm_syscall 260d95bc250SWill Deacon mov why, #0 @ no longer a real syscall 2611da177e4SLinus Torvalds b sys_ni_syscall @ not private func 2621aa2b3b7SWill Deacon 2631aa2b3b7SWill Deacon#if defined(CONFIG_OABI_COMPAT) || !defined(CONFIG_AEABI) 2641aa2b3b7SWill Deacon /* 2651aa2b3b7SWill Deacon * We failed to handle a fault trying to access the page 2661aa2b3b7SWill Deacon * containing the swi instruction, but we're not really in a 2671aa2b3b7SWill Deacon * position to return -EFAULT. Instead, return back to the 2681aa2b3b7SWill Deacon * instruction and re-enter the user fault handling path trying 2691aa2b3b7SWill Deacon * to page it in. This will likely result in sending SEGV to the 2701aa2b3b7SWill Deacon * current task. 2711aa2b3b7SWill Deacon */ 2721aa2b3b7SWill Deacon9001: 273309ee042SRussell King sub lr, saved_pc, #4 2741aa2b3b7SWill Deacon str lr, [sp, #S_PC] 275da594e3fSRussell King get_thread_info tsk 2761aa2b3b7SWill Deacon b ret_fast_syscall 2771aa2b3b7SWill Deacon#endif 27893ed3970SCatalin MarinasENDPROC(vector_swi) 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds /* 2811da177e4SLinus Torvalds * This is the really slow path. We're going to be doing 2821da177e4SLinus Torvalds * context switches, and waiting for our parent to respond. 2831da177e4SLinus Torvalds */ 2841da177e4SLinus Torvalds__sys_trace: 285ad722541SWill Deacon add r0, sp, #S_OFF 286ad722541SWill Deacon bl syscall_trace_enter 28710573ae5SRussell King mov scno, r0 28810573ae5SRussell King invoke_syscall tbl, scno, r10, __sys_trace_return, reload=1 289ad75b514SKees Cook cmp scno, #-1 @ skip the syscall? 290ad75b514SKees Cook bne 2b 291ad75b514SKees Cook add sp, sp, #S_OFF @ restore stack 2921da177e4SLinus Torvalds 293f18aef74STimothy E Baldwin__sys_trace_return_nosave: 294f18aef74STimothy E Baldwin enable_irq_notrace 295ad722541SWill Deacon mov r0, sp 296ad722541SWill Deacon bl syscall_trace_exit 2971da177e4SLinus Torvalds b ret_slow_syscall 2981da177e4SLinus Torvalds 299f18aef74STimothy E Baldwin__sys_trace_return: 300f18aef74STimothy E Baldwin str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 3013302caddSRussell King mov r0, sp 3023302caddSRussell King bl syscall_trace_exit 3033302caddSRussell King b ret_slow_syscall 3043302caddSRussell King 3051da177e4SLinus Torvalds .align 5 3061da177e4SLinus Torvalds#ifdef CONFIG_ALIGNMENT_TRAP 3071da177e4SLinus Torvalds .type __cr_alignment, #object 3081da177e4SLinus Torvalds__cr_alignment: 3091da177e4SLinus Torvalds .word cr_alignment 3101da177e4SLinus Torvalds#endif 311dd35afc2SNicolas Pitre .ltorg 312dd35afc2SNicolas Pitre 31396a8fae0SRussell King .macro syscall_table_start, sym 31496a8fae0SRussell King .equ __sys_nr, 0 31596a8fae0SRussell King .type \sym, #object 31696a8fae0SRussell KingENTRY(\sym) 31796a8fae0SRussell King .endm 31896a8fae0SRussell King 31996a8fae0SRussell King .macro syscall, nr, func 32096a8fae0SRussell King .ifgt __sys_nr - \nr 32196a8fae0SRussell King .error "Duplicated/unorded system call entry" 32296a8fae0SRussell King .endif 32396a8fae0SRussell King .rept \nr - __sys_nr 32496a8fae0SRussell King .long sys_ni_syscall 32596a8fae0SRussell King .endr 32696a8fae0SRussell King .long \func 32796a8fae0SRussell King .equ __sys_nr, \nr + 1 32896a8fae0SRussell King .endm 32996a8fae0SRussell King 33096a8fae0SRussell King .macro syscall_table_end, sym 33196a8fae0SRussell King .ifgt __sys_nr - __NR_syscalls 33296a8fae0SRussell King .error "System call table too big" 33396a8fae0SRussell King .endif 33496a8fae0SRussell King .rept __NR_syscalls - __sys_nr 33596a8fae0SRussell King .long sys_ni_syscall 33696a8fae0SRussell King .endr 33796a8fae0SRussell King .size \sym, . - \sym 33896a8fae0SRussell King .endm 33996a8fae0SRussell King 3400047eb9fSMasahiro Yamada#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native) 3410047eb9fSMasahiro Yamada#define __SYSCALL(nr, func) syscall nr, func 34296a8fae0SRussell King 343dd35afc2SNicolas Pitre/* 344dd35afc2SNicolas Pitre * This is the syscall table declaration for native ABI syscalls. 345dd35afc2SNicolas Pitre * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall. 346dd35afc2SNicolas Pitre */ 34796a8fae0SRussell King syscall_table_start sys_call_table 348dd35afc2SNicolas Pitre#ifdef CONFIG_AEABI 34996a8fae0SRussell King#include <calls-eabi.S> 350dd35afc2SNicolas Pitre#else 35196a8fae0SRussell King#include <calls-oabi.S> 352dd35afc2SNicolas Pitre#endif 35396a8fae0SRussell King syscall_table_end sys_call_table 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds/*============================================================================ 3561da177e4SLinus Torvalds * Special system call wrappers 3571da177e4SLinus Torvalds */ 3581da177e4SLinus Torvalds@ r0 = syscall number 359567bd980SRussell King@ r8 = syscall table 3601da177e4SLinus Torvaldssys_syscall: 3615247593cSPaul Brook bic scno, r0, #__NR_OABI_SYSCALL_BASE 3621da177e4SLinus Torvalds cmp scno, #__NR_syscall - __NR_SYSCALL_BASE 3631da177e4SLinus Torvalds cmpne scno, #NR_syscalls @ check range 36410573ae5SRussell King#ifdef CONFIG_CPU_SPECTRE 36510573ae5SRussell King movhs scno, #0 36610573ae5SRussell King csdb 36710573ae5SRussell King#endif 368e44fc388SStefan Agner stmialo sp, {r5, r6} @ shuffle args 3691da177e4SLinus Torvalds movlo r0, r1 3701da177e4SLinus Torvalds movlo r1, r2 3711da177e4SLinus Torvalds movlo r2, r3 3721da177e4SLinus Torvalds movlo r3, r4 3731da177e4SLinus Torvalds ldrlo pc, [tbl, scno, lsl #2] 3741da177e4SLinus Torvalds b sys_ni_syscall 37593ed3970SCatalin MarinasENDPROC(sys_syscall) 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvaldssys_sigreturn_wrapper: 3781da177e4SLinus Torvalds add r0, sp, #S_OFF 379653d48b2SAl Viro mov why, #0 @ prevent syscall restart handling 3801da177e4SLinus Torvalds b sys_sigreturn 38193ed3970SCatalin MarinasENDPROC(sys_sigreturn_wrapper) 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvaldssys_rt_sigreturn_wrapper: 3841da177e4SLinus Torvalds add r0, sp, #S_OFF 385653d48b2SAl Viro mov why, #0 @ prevent syscall restart handling 3861da177e4SLinus Torvalds b sys_rt_sigreturn 38793ed3970SCatalin MarinasENDPROC(sys_rt_sigreturn_wrapper) 3881da177e4SLinus Torvalds 389713c4815SNicolas Pitresys_statfs64_wrapper: 390713c4815SNicolas Pitre teq r1, #88 391713c4815SNicolas Pitre moveq r1, #84 392713c4815SNicolas Pitre b sys_statfs64 39393ed3970SCatalin MarinasENDPROC(sys_statfs64_wrapper) 394713c4815SNicolas Pitre 395713c4815SNicolas Pitresys_fstatfs64_wrapper: 396713c4815SNicolas Pitre teq r1, #88 397713c4815SNicolas Pitre moveq r1, #84 398713c4815SNicolas Pitre b sys_fstatfs64 39993ed3970SCatalin MarinasENDPROC(sys_fstatfs64_wrapper) 400713c4815SNicolas Pitre 4011da177e4SLinus Torvalds/* 4021da177e4SLinus Torvalds * Note: off_4k (r5) is always units of 4K. If we can't do the requested 4031da177e4SLinus Torvalds * offset, we return EINVAL. 4041da177e4SLinus Torvalds */ 4051da177e4SLinus Torvaldssys_mmap2: 4061da177e4SLinus Torvalds str r5, [sp, #4] 407f8b72560SAl Viro b sys_mmap_pgoff 40893ed3970SCatalin MarinasENDPROC(sys_mmap2) 409687ad019SNicolas Pitre 410687ad019SNicolas Pitre#ifdef CONFIG_OABI_COMPAT 411dd35afc2SNicolas Pitre 412687ad019SNicolas Pitre/* 413687ad019SNicolas Pitre * These are syscalls with argument register differences 414687ad019SNicolas Pitre */ 415687ad019SNicolas Pitre 416687ad019SNicolas Pitresys_oabi_pread64: 417687ad019SNicolas Pitre stmia sp, {r3, r4} 418687ad019SNicolas Pitre b sys_pread64 41993ed3970SCatalin MarinasENDPROC(sys_oabi_pread64) 420687ad019SNicolas Pitre 421687ad019SNicolas Pitresys_oabi_pwrite64: 422687ad019SNicolas Pitre stmia sp, {r3, r4} 423687ad019SNicolas Pitre b sys_pwrite64 42493ed3970SCatalin MarinasENDPROC(sys_oabi_pwrite64) 425687ad019SNicolas Pitre 426687ad019SNicolas Pitresys_oabi_truncate64: 427687ad019SNicolas Pitre mov r3, r2 428687ad019SNicolas Pitre mov r2, r1 429687ad019SNicolas Pitre b sys_truncate64 43093ed3970SCatalin MarinasENDPROC(sys_oabi_truncate64) 431687ad019SNicolas Pitre 432687ad019SNicolas Pitresys_oabi_ftruncate64: 433687ad019SNicolas Pitre mov r3, r2 434687ad019SNicolas Pitre mov r2, r1 435687ad019SNicolas Pitre b sys_ftruncate64 43693ed3970SCatalin MarinasENDPROC(sys_oabi_ftruncate64) 437687ad019SNicolas Pitre 438687ad019SNicolas Pitresys_oabi_readahead: 439687ad019SNicolas Pitre str r3, [sp] 440687ad019SNicolas Pitre mov r3, r2 441687ad019SNicolas Pitre mov r2, r1 442687ad019SNicolas Pitre b sys_readahead 44393ed3970SCatalin MarinasENDPROC(sys_oabi_readahead) 444687ad019SNicolas Pitre 445dd35afc2SNicolas Pitre/* 446dd35afc2SNicolas Pitre * Let's declare a second syscall table for old ABI binaries 447dd35afc2SNicolas Pitre * using the compatibility syscall entries. 448dd35afc2SNicolas Pitre */ 44996a8fae0SRussell King syscall_table_start sys_oabi_call_table 4500047eb9fSMasahiro Yamada#undef __SYSCALL_WITH_COMPAT 4510047eb9fSMasahiro Yamada#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, compat) 45296a8fae0SRussell King#include <calls-oabi.S> 45396a8fae0SRussell King syscall_table_end sys_oabi_call_table 454dd35afc2SNicolas Pitre 455687ad019SNicolas Pitre#endif 456687ad019SNicolas Pitre 457