* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
-#include <linux/config.h>
-#include <asm/thread_info.h>
-#include <asm/ptrace.h>
#include <asm/unistd.h>
#include "entry-header.S"
ldr r1, [tsk, #TI_FLAGS]
tst r1, #_TIF_WORK_MASK
bne fast_work_pending
- fast_restore_user_regs
+
+ @ fast_restore_user_regs
+ ldr r1, [sp, #S_OFF + S_PSR] @ get calling cpsr
+ ldr lr, [sp, #S_OFF + S_PC]! @ get pc
+ msr spsr_cxsf, r1 @ save in spsr_svc
+ ldmdb sp, {r1 - lr}^ @ get calling r1 - lr
+ mov r0, r0
+ add sp, sp, #S_FRAME_SIZE - S_PC
+ movs pc, lr @ return & move spsr_svc into cpsr
/*
* Ok, we need to do extra processing, enter the slow path.
mov r0, sp @ 'regs'
mov r2, why @ 'syscall'
bl do_notify_resume
- disable_irq @ disable interrupts
- b no_work_pending
+ b ret_slow_syscall @ Check work again
work_resched:
bl schedule
tst r1, #_TIF_WORK_MASK
bne work_pending
no_work_pending:
- slow_restore_user_regs
+ @ slow_restore_user_regs
+ ldr r1, [sp, #S_PSR] @ get calling cpsr
+ ldr lr, [sp, #S_PC]! @ get pc
+ msr spsr_cxsf, r1 @ save in spsr_svc
+ ldmdb sp, {r0 - lr}^ @ get calling r1 - lr
+ mov r0, r0
+ add sp, sp, #S_FRAME_SIZE - S_PC
+ movs pc, lr @ return & move spsr_svc into cpsr
/*
* This is how we return from a fork.
b ret_slow_syscall
+ .equ NR_syscalls,0
+#define CALL(x) .equ NR_syscalls,NR_syscalls+1
#include "calls.S"
+#undef CALL
+#define CALL(x) .long x
/*=============================================================================
* SWI handler
run on an ARM7 and we can save a couple of instructions.
--pb */
#ifdef CONFIG_CPU_ARM710
- .macro arm710_bug_check, instr, temp
- and \temp, \instr, #0x0f000000 @ check for SWI
- teq \temp, #0x0f000000
- bne .Larm700bug
- .endm
-
-.Larm700bug:
- ldr r0, [sp, #S_PSR] @ Get calling cpsr
- sub lr, lr, #4
- str lr, [r8]
- msr spsr_cxsf, r0
+#define A710(code...) code
+.Larm710bug:
ldmia sp, {r0 - lr}^ @ Get calling r0 - lr
mov r0, r0
- ldr lr, [sp, #S_PC] @ Get PC
add sp, sp, #S_FRAME_SIZE
- movs pc, lr
+ subs pc, lr, #4
#else
- .macro arm710_bug_check, instr, temp
- .endm
+#define A710(code...)
#endif
.align 5
ENTRY(vector_swi)
- save_user_regs
+ sub sp, sp, #S_FRAME_SIZE
+ stmia sp, {r0 - r12} @ Calling r0 - r12
+ add r8, sp, #S_PC
+ stmdb r8, {sp, lr}^ @ Calling sp, lr
+ mrs r8, spsr @ called from non-FIQ mode, so ok.
+ str lr, [sp, #S_PC] @ Save calling PC
+ str r8, [sp, #S_PSR] @ Save CPSR
+ str r0, [sp, #S_OLD_R0] @ Save OLD_R0
zero_fp
/*
* Get the system call number.
*/
+
+#if defined(CONFIG_OABI_COMPAT)
+
+ /*
+ * If we have CONFIG_OABI_COMPAT then we need to look at the swi
+ * value to determine if it is an EABI or an old ABI call.
+ */
#ifdef CONFIG_ARM_THUMB
+ tst r8, #PSR_T_BIT
+ movne r10, #0 @ no thumb OABI emulation
+ ldreq r10, [lr, #-4] @ get SWI instruction
+#else
+ ldr r10, [lr, #-4] @ get SWI instruction
+ A710( and ip, r10, #0x0f000000 @ check for SWI )
+ A710( teq ip, #0x0f000000 )
+ A710( bne .Larm710bug )
+#endif
+
+#elif defined(CONFIG_AEABI)
+
+ /*
+ * Pure EABI user space always put syscall number into scno (r7).
+ */
+ A710( ldr ip, [lr, #-4] @ get SWI instruction )
+ A710( and ip, ip, #0x0f000000 @ check for SWI )
+ A710( teq ip, #0x0f000000 )
+ A710( bne .Larm710bug )
+
+#elif defined(CONFIG_ARM_THUMB)
+
+ /* Legacy ABI only, possibly thumb mode. */
tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs
addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in
ldreq scno, [lr, #-4]
+
#else
+
+ /* Legacy ABI only. */
ldr scno, [lr, #-4] @ get SWI instruction
+ A710( and ip, scno, #0x0f000000 @ check for SWI )
+ A710( teq ip, #0x0f000000 )
+ A710( bne .Larm710bug )
+
#endif
- arm710_bug_check scno, ip
#ifdef CONFIG_ALIGNMENT_TRAP
ldr ip, __cr_alignment
#endif
enable_irq
- str r4, [sp, #-S_OFF]! @ push fifth arg
-
get_thread_info tsk
+ adr tbl, sys_call_table @ load syscall table pointer
ldr ip, [tsk, #TI_FLAGS] @ check for syscall tracing
+
+#if defined(CONFIG_OABI_COMPAT)
+ /*
+ * If the swi argument is zero, this is an EABI call and we do nothing.
+ *
+ * If this is an old ABI call, get the syscall number into scno and
+ * get the old ABI syscall table address.
+ */
+ bics r10, r10, #0xff000000
+ eorne scno, r10, #__NR_OABI_SYSCALL_BASE
+ ldrne tbl, =sys_oabi_call_table
+#elif !defined(CONFIG_AEABI)
bic scno, scno, #0xff000000 @ mask off SWI op-code
eor scno, scno, #__NR_SYSCALL_BASE @ check OS number
- adr tbl, sys_call_table @ load syscall table pointer
+#endif
+
+ stmdb sp!, {r4, r5} @ push fifth and sixth args
tst ip, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
bne __sys_trace
- adr lr, ret_fast_syscall @ return address
cmp scno, #NR_syscalls @ check upper syscall limit
+ adr lr, ret_fast_syscall @ return address
ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
add r1, sp, #S_OFF
* context switches, and waiting for our parent to respond.
*/
__sys_trace:
+ mov r2, scno
add r1, sp, #S_OFF
mov r0, #0 @ trace entry [IP = 0]
bl syscall_trace
adr lr, __sys_trace_return @ return address
+ mov scno, r0 @ syscall number (possibly new)
add r1, sp, #S_R0 + S_OFF @ pointer to regs
cmp scno, #NR_syscalls @ check upper syscall limit
ldmccia r1, {r0 - r3} @ have to reload r0 - r3
__sys_trace_return:
str r0, [sp, #S_R0 + S_OFF]! @ save returned r0
+ mov r2, scno
mov r1, sp
mov r0, #1 @ trace exit [IP = 1]
bl syscall_trace
__cr_alignment:
.word cr_alignment
#endif
+ .ltorg
+
+/*
+ * This is the syscall table declaration for native ABI syscalls.
+ * With EABI a couple syscalls are obsolete and defined as sys_ni_syscall.
+ */
+#define ABI(native, compat) native
+#ifdef CONFIG_AEABI
+#define OBSOLETE(syscall) sys_ni_syscall
+#else
+#define OBSOLETE(syscall) syscall
+#endif
.type sys_call_table, #object
ENTRY(sys_call_table)
#include "calls.S"
+#undef ABI
+#undef OBSOLETE
/*============================================================================
* Special system call wrappers
*/
@ r0 = syscall number
-@ r5 = syscall table
+@ r8 = syscall table
.type sys_syscall, #function
sys_syscall:
- eor scno, r0, #__NR_SYSCALL_BASE
+ bic scno, r0, #__NR_OABI_SYSCALL_BASE
cmp scno, #__NR_syscall - __NR_SYSCALL_BASE
cmpne scno, #NR_syscalls @ check range
stmloia sp, {r5, r6} @ shuffle args
ldr r2, [sp, #S_OFF + S_SP]
b do_sigaltstack
-sys_futex_wrapper:
- str r5, [sp, #4] @ push sixth arg
- b sys_futex
+sys_statfs64_wrapper:
+ teq r1, #88
+ moveq r1, #84
+ b sys_statfs64
+
+sys_fstatfs64_wrapper:
+ teq r1, #88
+ moveq r1, #84
+ b sys_fstatfs64
/*
* Note: off_4k (r5) is always units of 4K. If we can't do the requested
streq r5, [sp, #4]
beq do_mmap2
mov r0, #-EINVAL
- RETINSTR(mov,pc, lr)
+ mov pc, lr
#else
str r5, [sp, #4]
b do_mmap2
#endif
+
+#ifdef CONFIG_OABI_COMPAT
+
+/*
+ * These are syscalls with argument register differences
+ */
+
+sys_oabi_pread64:
+ stmia sp, {r3, r4}
+ b sys_pread64
+
+sys_oabi_pwrite64:
+ stmia sp, {r3, r4}
+ b sys_pwrite64
+
+sys_oabi_truncate64:
+ mov r3, r2
+ mov r2, r1
+ b sys_truncate64
+
+sys_oabi_ftruncate64:
+ mov r3, r2
+ mov r2, r1
+ b sys_ftruncate64
+
+sys_oabi_readahead:
+ str r3, [sp]
+ mov r3, r2
+ mov r2, r1
+ b sys_readahead
+
+/*
+ * Let's declare a second syscall table for old ABI binaries
+ * using the compatibility syscall entries.
+ */
+#define ABI(native, compat) compat
+#define OBSOLETE(syscall) syscall
+
+ .type sys_oabi_call_table, #object
+ENTRY(sys_oabi_call_table)
+#include "calls.S"
+#undef ABI
+#undef OBSOLETE
+
+#endif
+
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