summaryrefslogtreecommitdiff
path: root/arch/c6x/kernel/entry.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/c6x/kernel/entry.S')
-rw-r--r--arch/c6x/kernel/entry.S803
1 files changed, 803 insertions, 0 deletions
diff --git a/arch/c6x/kernel/entry.S b/arch/c6x/kernel/entry.S
new file mode 100644
index 00000000000..3e977ccda82
--- /dev/null
+++ b/arch/c6x/kernel/entry.S
@@ -0,0 +1,803 @@
+;
+; Port on Texas Instruments TMS320C6x architecture
+;
+; Copyright (C) 2004-2011 Texas Instruments Incorporated
+; Author: Aurelien Jacquiot (aurelien.jacquiot@virtuallogix.com)
+; Updated for 2.6.34: Mark Salter <msalter@redhat.com>
+;
+; This program is free software; you can redistribute it and/or modify
+; it under the terms of the GNU General Public License version 2 as
+; published by the Free Software Foundation.
+;
+
+#include <linux/sys.h>
+#include <linux/linkage.h>
+#include <asm/thread_info.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+#include <asm/errno.h>
+
+; Registers naming
+#define DP B14
+#define SP B15
+
+#ifndef CONFIG_PREEMPT
+#define resume_kernel restore_all
+#endif
+
+ .altmacro
+
+ .macro MASK_INT reg
+ MVC .S2 CSR,reg
+ CLR .S2 reg,0,0,reg
+ MVC .S2 reg,CSR
+ .endm
+
+ .macro UNMASK_INT reg
+ MVC .S2 CSR,reg
+ SET .S2 reg,0,0,reg
+ MVC .S2 reg,CSR
+ .endm
+
+ .macro GET_THREAD_INFO reg
+ SHR .S1X SP,THREAD_SHIFT,reg
+ SHL .S1 reg,THREAD_SHIFT,reg
+ .endm
+
+ ;;
+ ;; This defines the normal kernel pt_regs layout.
+ ;;
+ .macro SAVE_ALL __rp __tsr
+ STW .D2T2 B0,*SP--[2] ; save original B0
+ MVKL .S2 current_ksp,B0
+ MVKH .S2 current_ksp,B0
+ LDW .D2T2 *B0,B1 ; KSP
+
+ NOP 3
+ STW .D2T2 B1,*+SP[1] ; save original B1
+ XOR .D2 SP,B1,B0 ; (SP ^ KSP)
+ LDW .D2T2 *+SP[1],B1 ; restore B0/B1
+ LDW .D2T2 *++SP[2],B0
+ SHR .S2 B0,THREAD_SHIFT,B0 ; 0 if already using kstack
+ [B0] STDW .D2T2 SP:DP,*--B1[1] ; user: save user sp/dp kstack
+ [B0] MV .S2 B1,SP ; and switch to kstack
+||[!B0] STDW .D2T2 SP:DP,*--SP[1] ; kernel: save on current stack
+
+ SUBAW .D2 SP,2,SP
+
+ ADD .D1X SP,-8,A15
+ || STDW .D2T1 A15:A14,*SP--[16] ; save A15:A14
+
+ STDW .D2T2 B13:B12,*SP--[1]
+ || STDW .D1T1 A13:A12,*A15--[1]
+ || MVC .S2 __rp,B13
+
+ STDW .D2T2 B11:B10,*SP--[1]
+ || STDW .D1T1 A11:A10,*A15--[1]
+ || MVC .S2 CSR,B12
+
+ STDW .D2T2 B9:B8,*SP--[1]
+ || STDW .D1T1 A9:A8,*A15--[1]
+ || MVC .S2 RILC,B11
+ STDW .D2T2 B7:B6,*SP--[1]
+ || STDW .D1T1 A7:A6,*A15--[1]
+ || MVC .S2 ILC,B10
+
+ STDW .D2T2 B5:B4,*SP--[1]
+ || STDW .D1T1 A5:A4,*A15--[1]
+
+ STDW .D2T2 B3:B2,*SP--[1]
+ || STDW .D1T1 A3:A2,*A15--[1]
+ || MVC .S2 __tsr,B5
+
+ STDW .D2T2 B1:B0,*SP--[1]
+ || STDW .D1T1 A1:A0,*A15--[1]
+ || MV .S1X B5,A5
+
+ STDW .D2T2 B31:B30,*SP--[1]
+ || STDW .D1T1 A31:A30,*A15--[1]
+ STDW .D2T2 B29:B28,*SP--[1]
+ || STDW .D1T1 A29:A28,*A15--[1]
+ STDW .D2T2 B27:B26,*SP--[1]
+ || STDW .D1T1 A27:A26,*A15--[1]
+ STDW .D2T2 B25:B24,*SP--[1]
+ || STDW .D1T1 A25:A24,*A15--[1]
+ STDW .D2T2 B23:B22,*SP--[1]
+ || STDW .D1T1 A23:A22,*A15--[1]
+ STDW .D2T2 B21:B20,*SP--[1]
+ || STDW .D1T1 A21:A20,*A15--[1]
+ STDW .D2T2 B19:B18,*SP--[1]
+ || STDW .D1T1 A19:A18,*A15--[1]
+ STDW .D2T2 B17:B16,*SP--[1]
+ || STDW .D1T1 A17:A16,*A15--[1]
+
+ STDW .D2T2 B13:B12,*SP--[1] ; save PC and CSR
+
+ STDW .D2T2 B11:B10,*SP--[1] ; save RILC and ILC
+ STDW .D2T1 A5:A4,*SP--[1] ; save TSR and orig A4
+
+ ;; We left an unused word on the stack just above pt_regs.
+ ;; It is used to save whether or not this frame is due to
+ ;; a syscall. It is cleared here, but the syscall handler
+ ;; sets it to a non-zero value.
+ MVK .L2 0,B1
+ STW .D2T2 B1,*+SP(REGS__END+8) ; clear syscall flag
+ .endm
+
+ .macro RESTORE_ALL __rp __tsr
+ LDDW .D2T2 *++SP[1],B9:B8 ; get TSR (B9)
+ LDDW .D2T2 *++SP[1],B11:B10 ; get RILC (B11) and ILC (B10)
+ LDDW .D2T2 *++SP[1],B13:B12 ; get PC (B13) and CSR (B12)
+
+ ADDAW .D1X SP,30,A15
+
+ LDDW .D1T1 *++A15[1],A17:A16
+ || LDDW .D2T2 *++SP[1],B17:B16
+ LDDW .D1T1 *++A15[1],A19:A18
+ || LDDW .D2T2 *++SP[1],B19:B18
+ LDDW .D1T1 *++A15[1],A21:A20
+ || LDDW .D2T2 *++SP[1],B21:B20
+ LDDW .D1T1 *++A15[1],A23:A22
+ || LDDW .D2T2 *++SP[1],B23:B22
+ LDDW .D1T1 *++A15[1],A25:A24
+ || LDDW .D2T2 *++SP[1],B25:B24
+ LDDW .D1T1 *++A15[1],A27:A26
+ || LDDW .D2T2 *++SP[1],B27:B26
+ LDDW .D1T1 *++A15[1],A29:A28
+ || LDDW .D2T2 *++SP[1],B29:B28
+ LDDW .D1T1 *++A15[1],A31:A30
+ || LDDW .D2T2 *++SP[1],B31:B30
+
+ LDDW .D1T1 *++A15[1],A1:A0
+ || LDDW .D2T2 *++SP[1],B1:B0
+
+ LDDW .D1T1 *++A15[1],A3:A2
+ || LDDW .D2T2 *++SP[1],B3:B2
+ || MVC .S2 B9,__tsr
+ LDDW .D1T1 *++A15[1],A5:A4
+ || LDDW .D2T2 *++SP[1],B5:B4
+ || MVC .S2 B11,RILC
+ LDDW .D1T1 *++A15[1],A7:A6
+ || LDDW .D2T2 *++SP[1],B7:B6
+ || MVC .S2 B10,ILC
+
+ LDDW .D1T1 *++A15[1],A9:A8
+ || LDDW .D2T2 *++SP[1],B9:B8
+ || MVC .S2 B13,__rp
+
+ LDDW .D1T1 *++A15[1],A11:A10
+ || LDDW .D2T2 *++SP[1],B11:B10
+ || MVC .S2 B12,CSR
+
+ LDDW .D1T1 *++A15[1],A13:A12
+ || LDDW .D2T2 *++SP[1],B13:B12
+
+ MV .D2X A15,SP
+ || MVKL .S1 current_ksp,A15
+ MVKH .S1 current_ksp,A15
+ || ADDAW .D1X SP,6,A14
+ STW .D1T1 A14,*A15 ; save kernel stack pointer
+
+ LDDW .D2T1 *++SP[1],A15:A14
+
+ B .S2 __rp ; return from interruption
+ LDDW .D2T2 *+SP[1],SP:DP
+ NOP 4
+ .endm
+
+ .section .text
+
+ ;;
+ ;; Jump to schedule() then return to ret_from_exception
+ ;;
+_reschedule:
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 schedule,A0
+ MVKH .S1 schedule,A0
+ B .S2X A0
+#else
+ B .S1 schedule
+#endif
+ ADDKPC .S2 ret_from_exception,B3,4
+
+ ;;
+ ;; Called before syscall handler when process is being debugged
+ ;;
+tracesys_on:
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 syscall_trace_entry,A0
+ MVKH .S1 syscall_trace_entry,A0
+ B .S2X A0
+#else
+ B .S1 syscall_trace_entry
+#endif
+ ADDKPC .S2 ret_from_syscall_trace,B3,3
+ ADD .S1X 8,SP,A4
+
+ret_from_syscall_trace:
+ ;; tracing returns (possibly new) syscall number
+ MV .D2X A4,B0
+ || MVK .S2 __NR_syscalls,B1
+ CMPLTU .L2 B0,B1,B1
+
+ [!B1] BNOP .S2 ret_from_syscall_function,5
+ || MVK .S1 -ENOSYS,A4
+
+ ;; reload syscall args from (possibly modified) stack frame
+ ;; and get syscall handler addr from sys_call_table:
+ LDW .D2T2 *+SP(REGS_B4+8),B4
+ || MVKL .S2 sys_call_table,B1
+ LDW .D2T1 *+SP(REGS_A6+8),A6
+ || MVKH .S2 sys_call_table,B1
+ LDW .D2T2 *+B1[B0],B0
+ || MVKL .S2 ret_from_syscall_function,B3
+ LDW .D2T2 *+SP(REGS_B6+8),B6
+ || MVKH .S2 ret_from_syscall_function,B3
+ LDW .D2T1 *+SP(REGS_A8+8),A8
+ LDW .D2T2 *+SP(REGS_B8+8),B8
+ NOP
+ ; B0 = sys_call_table[__NR_*]
+ BNOP .S2 B0,5 ; branch to syscall handler
+ || LDW .D2T1 *+SP(REGS_ORIG_A4+8),A4
+
+syscall_exit_work:
+ AND .D1 _TIF_SYSCALL_TRACE,A2,A0
+ [!A0] BNOP .S1 work_pending,5
+ [A0] B .S2 syscall_trace_exit
+ ADDKPC .S2 resume_userspace,B3,1
+ MVC .S2 CSR,B1
+ SET .S2 B1,0,0,B1
+ MVC .S2 B1,CSR ; enable ints
+
+work_pending:
+ AND .D1 _TIF_NEED_RESCHED,A2,A0
+ [!A0] BNOP .S1 work_notifysig,5
+
+work_resched:
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 schedule,A1
+ MVKH .S1 schedule,A1
+ B .S2X A1
+#else
+ B .S2 schedule
+#endif
+ ADDKPC .S2 work_rescheduled,B3,4
+work_rescheduled:
+ ;; make sure we don't miss an interrupt setting need_resched or
+ ;; sigpending between sampling and the rti
+ MASK_INT B2
+ GET_THREAD_INFO A12
+ LDW .D1T1 *+A12(THREAD_INFO_FLAGS),A2
+ MVK .S1 _TIF_WORK_MASK,A1
+ MVK .S1 _TIF_NEED_RESCHED,A3
+ NOP 2
+ AND .D1 A1,A2,A0
+ || AND .S1 A3,A2,A1
+ [!A0] BNOP .S1 restore_all,5
+ [A1] BNOP .S1 work_resched,5
+
+work_notifysig:
+ B .S2 do_notify_resume
+ LDW .D2T1 *+SP(REGS__END+8),A6 ; syscall flag
+ ADDKPC .S2 resume_userspace,B3,1
+ ADD .S1X 8,SP,A4 ; pt_regs pointer is first arg
+ MV .D2X A2,B4 ; thread_info flags is second arg
+
+ ;;
+ ;; On C64x+, the return way from exception and interrupt
+ ;; is a little bit different
+ ;;
+ENTRY(ret_from_exception)
+#ifdef CONFIG_PREEMPT
+ MASK_INT B2
+#endif
+
+ENTRY(ret_from_interrupt)
+ ;;
+ ;; Check if we are comming from user mode.
+ ;;
+ LDW .D2T2 *+SP(REGS_TSR+8),B0
+ MVK .S2 0x40,B1
+ NOP 3
+ AND .D2 B0,B1,B0
+ [!B0] BNOP .S2 resume_kernel,5
+
+resume_userspace:
+ ;; make sure we don't miss an interrupt setting need_resched or
+ ;; sigpending between sampling and the rti
+ MASK_INT B2
+ GET_THREAD_INFO A12
+ LDW .D1T1 *+A12(THREAD_INFO_FLAGS),A2
+ MVK .S1 _TIF_WORK_MASK,A1
+ MVK .S1 _TIF_NEED_RESCHED,A3
+ NOP 2
+ AND .D1 A1,A2,A0
+ [A0] BNOP .S1 work_pending,5
+ BNOP .S1 restore_all,5
+
+ ;;
+ ;; System call handling
+ ;; B0 = syscall number (in sys_call_table)
+ ;; A4,B4,A6,B6,A8,B8 = arguments of the syscall function
+ ;; A4 is the return value register
+ ;;
+system_call_saved:
+ MVK .L2 1,B2
+ STW .D2T2 B2,*+SP(REGS__END+8) ; set syscall flag
+ MVC .S2 B2,ECR ; ack the software exception
+
+ UNMASK_INT B2 ; re-enable global IT
+
+system_call_saved_noack:
+ ;; Check system call number
+ MVK .S2 __NR_syscalls,B1
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKL .S1 sys_ni_syscall,A0
+#endif
+ CMPLTU .L2 B0,B1,B1
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKH .S1 sys_ni_syscall,A0
+#endif
+
+ ;; Check for ptrace
+ GET_THREAD_INFO A12
+
+#ifdef CONFIG_C6X_BIG_KERNEL
+ [!B1] B .S2X A0
+#else
+ [!B1] B .S2 sys_ni_syscall
+#endif
+ [!B1] ADDKPC .S2 ret_from_syscall_function,B3,4
+
+ ;; Get syscall handler addr from sys_call_table
+ ;; call tracesys_on or call syscall handler
+ LDW .D1T1 *+A12(THREAD_INFO_FLAGS),A2
+ || MVKL .S2 sys_call_table,B1
+ MVKH .S2 sys_call_table,B1
+ LDW .D2T2 *+B1[B0],B0
+ NOP 2
+ ; A2 = thread_info flags
+ AND .D1 _TIF_SYSCALL_TRACE,A2,A2
+ [A2] BNOP .S1 tracesys_on,5
+ ;; B0 = _sys_call_table[__NR_*]
+ B .S2 B0
+ ADDKPC .S2 ret_from_syscall_function,B3,4
+
+ret_from_syscall_function:
+ STW .D2T1 A4,*+SP(REGS_A4+8) ; save return value in A4
+ ; original A4 is in orig_A4
+syscall_exit:
+ ;; make sure we don't miss an interrupt setting need_resched or
+ ;; sigpending between sampling and the rti
+ MASK_INT B2
+ LDW .D1T1 *+A12(THREAD_INFO_FLAGS),A2
+ MVK .S1 _TIF_ALLWORK_MASK,A1
+ NOP 3
+ AND .D1 A1,A2,A2 ; check for work to do
+ [A2] BNOP .S1 syscall_exit_work,5
+
+restore_all:
+ RESTORE_ALL NRP,NTSR
+
+ ;;
+ ;; After a fork we jump here directly from resume,
+ ;; so that A4 contains the previous task structure.
+ ;;
+ENTRY(ret_from_fork)
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 schedule_tail,A0
+ MVKH .S1 schedule_tail,A0
+ B .S2X A0
+#else
+ B .S2 schedule_tail
+#endif
+ ADDKPC .S2 ret_from_fork_2,B3,4
+ret_from_fork_2:
+ ;; return 0 in A4 for child process
+ GET_THREAD_INFO A12
+ BNOP .S2 syscall_exit,3
+ MVK .L2 0,B0
+ STW .D2T2 B0,*+SP(REGS_A4+8)
+ENDPROC(ret_from_fork)
+
+ ;;
+ ;; These are the interrupt handlers, responsible for calling __do_IRQ()
+ ;; int6 is used for syscalls (see _system_call entry)
+ ;;
+ .macro SAVE_ALL_INT
+ SAVE_ALL IRP,ITSR
+ .endm
+
+ .macro CALL_INT int
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 c6x_do_IRQ,A0
+ MVKH .S1 c6x_do_IRQ,A0
+ BNOP .S2X A0,1
+ MVK .S1 int,A4
+ ADDAW .D2 SP,2,B4
+ MVKL .S2 ret_from_interrupt,B3
+ MVKH .S2 ret_from_interrupt,B3
+#else
+ CALLP .S2 c6x_do_IRQ,B3
+ || MVK .S1 int,A4
+ || ADDAW .D2 SP,2,B4
+ B .S1 ret_from_interrupt
+ NOP 5
+#endif
+ .endm
+
+ENTRY(_int4_handler)
+ SAVE_ALL_INT
+ CALL_INT 4
+ENDPROC(_int4_handler)
+
+ENTRY(_int5_handler)
+ SAVE_ALL_INT
+ CALL_INT 5
+ENDPROC(_int5_handler)
+
+ENTRY(_int6_handler)
+ SAVE_ALL_INT
+ CALL_INT 6
+ENDPROC(_int6_handler)
+
+ENTRY(_int7_handler)
+ SAVE_ALL_INT
+ CALL_INT 7
+ENDPROC(_int7_handler)
+
+ENTRY(_int8_handler)
+ SAVE_ALL_INT
+ CALL_INT 8
+ENDPROC(_int8_handler)
+
+ENTRY(_int9_handler)
+ SAVE_ALL_INT
+ CALL_INT 9
+ENDPROC(_int9_handler)
+
+ENTRY(_int10_handler)
+ SAVE_ALL_INT
+ CALL_INT 10
+ENDPROC(_int10_handler)
+
+ENTRY(_int11_handler)
+ SAVE_ALL_INT
+ CALL_INT 11
+ENDPROC(_int11_handler)
+
+ENTRY(_int12_handler)
+ SAVE_ALL_INT
+ CALL_INT 12
+ENDPROC(_int12_handler)
+
+ENTRY(_int13_handler)
+ SAVE_ALL_INT
+ CALL_INT 13
+ENDPROC(_int13_handler)
+
+ENTRY(_int14_handler)
+ SAVE_ALL_INT
+ CALL_INT 14
+ENDPROC(_int14_handler)
+
+ENTRY(_int15_handler)
+ SAVE_ALL_INT
+ CALL_INT 15
+ENDPROC(_int15_handler)
+
+ ;;
+ ;; Handler for uninitialized and spurious interrupts
+ ;;
+ENTRY(_bad_interrupt)
+ B .S2 IRP
+ NOP 5
+ENDPROC(_bad_interrupt)
+
+ ;;
+ ;; Entry for NMI/exceptions/syscall
+ ;;
+ENTRY(_nmi_handler)
+ SAVE_ALL NRP,NTSR
+
+ MVC .S2 EFR,B2
+ CMPEQ .L2 1,B2,B2
+ || MVC .S2 TSR,B1
+ CLR .S2 B1,10,10,B1
+ MVC .S2 B1,TSR
+#ifdef CONFIG_C6X_BIG_KERNEL
+ [!B2] MVKL .S1 process_exception,A0
+ [!B2] MVKH .S1 process_exception,A0
+ [!B2] B .S2X A0
+#else
+ [!B2] B .S2 process_exception
+#endif
+ [B2] B .S2 system_call_saved
+ [!B2] ADDAW .D2 SP,2,B1
+ [!B2] MV .D1X B1,A4
+ ADDKPC .S2 ret_from_trap,B3,2
+
+ret_from_trap:
+ MV .D2X A4,B0
+ [!B0] BNOP .S2 ret_from_exception,5
+
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S2 system_call_saved_noack,B3
+ MVKH .S2 system_call_saved_noack,B3
+#endif
+ LDW .D2T2 *+SP(REGS_B0+8),B0
+ LDW .D2T1 *+SP(REGS_A4+8),A4
+ LDW .D2T2 *+SP(REGS_B4+8),B4
+ LDW .D2T1 *+SP(REGS_A6+8),A6
+ LDW .D2T2 *+SP(REGS_B6+8),B6
+ LDW .D2T1 *+SP(REGS_A8+8),A8
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || B .S2 B3
+#else
+ || B .S2 system_call_saved_noack
+#endif
+ LDW .D2T2 *+SP(REGS_B8+8),B8
+ NOP 4
+ENDPROC(_nmi_handler)
+
+ ;;
+ ;; Jump to schedule() then return to ret_from_isr
+ ;;
+#ifdef CONFIG_PREEMPT
+resume_kernel:
+ GET_THREAD_INFO A12
+ LDW .D1T1 *+A12(THREAD_INFO_PREEMPT_COUNT),A1
+ NOP 4
+ [A1] BNOP .S2 restore_all,5
+
+preempt_schedule:
+ GET_THREAD_INFO A2
+ LDW .D1T1 *+A2(THREAD_INFO_FLAGS),A1
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S2 preempt_schedule_irq,B0
+ MVKH .S2 preempt_schedule_irq,B0
+ NOP 2
+#else
+ NOP 4
+#endif
+ AND .D1 _TIF_NEED_RESCHED,A1,A1
+ [!A1] BNOP .S2 restore_all,5
+#ifdef CONFIG_C6X_BIG_KERNEL
+ B .S2 B0
+#else
+ B .S2 preempt_schedule_irq
+#endif
+ ADDKPC .S2 preempt_schedule,B3,4
+#endif /* CONFIG_PREEMPT */
+
+ENTRY(enable_exception)
+ DINT
+ MVC .S2 TSR,B0
+ MVC .S2 B3,NRP
+ MVK .L2 0xc,B1
+ OR .D2 B0,B1,B0
+ MVC .S2 B0,TSR ; Set GEE and XEN in TSR
+ B .S2 NRP
+ NOP 5
+ENDPROC(enable_exception)
+
+ENTRY(sys_sigaltstack)
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 do_sigaltstack,A0 ; branch to do_sigaltstack
+ MVKH .S1 do_sigaltstack,A0
+ B .S2X A0
+#else
+ B .S2 do_sigaltstack
+#endif
+ LDW .D2T1 *+SP(REGS_SP+8),A6
+ NOP 4
+ENDPROC(sys_sigaltstack)
+
+ ;; kernel_execve
+ENTRY(kernel_execve)
+ MVK .S2 __NR_execve,B0
+ SWE
+ BNOP .S2 B3,5
+ENDPROC(kernel_execve)
+
+ ;;
+ ;; Special system calls
+ ;; return address is in B3
+ ;;
+ENTRY(sys_clone)
+ ADD .D1X SP,8,A4
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKL .S1 sys_c6x_clone,A0
+ MVKH .S1 sys_c6x_clone,A0
+ BNOP .S2X A0,5
+#else
+ || B .S2 sys_c6x_clone
+ NOP 5
+#endif
+ENDPROC(sys_clone)
+
+ENTRY(sys_rt_sigreturn)
+ ADD .D1X SP,8,A4
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKL .S1 do_rt_sigreturn,A0
+ MVKH .S1 do_rt_sigreturn,A0
+ BNOP .S2X A0,5
+#else
+ || B .S2 do_rt_sigreturn
+ NOP 5
+#endif
+ENDPROC(sys_rt_sigreturn)
+
+ENTRY(sys_execve)
+ ADDAW .D2 SP,2,B6 ; put regs addr in 4th parameter
+ ; & adjust regs stack addr
+ LDW .D2T2 *+SP(REGS_B4+8),B4
+
+ ;; c6x_execve(char *name, char **argv,
+ ;; char **envp, struct pt_regs *regs)
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKL .S1 sys_c6x_execve,A0
+ MVKH .S1 sys_c6x_execve,A0
+ B .S2X A0
+#else
+ || B .S2 sys_c6x_execve
+#endif
+ STW .D2T2 B3,*SP--[2]
+ ADDKPC .S2 ret_from_c6x_execve,B3,3
+
+ret_from_c6x_execve:
+ LDW .D2T2 *++SP[2],B3
+ NOP 4
+ BNOP .S2 B3,5
+ENDPROC(sys_execve)
+
+ENTRY(sys_pread_c6x)
+ MV .D2X A8,B7
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKL .S1 sys_pread64,A0
+ MVKH .S1 sys_pread64,A0
+ BNOP .S2X A0,5
+#else
+ || B .S2 sys_pread64
+ NOP 5
+#endif
+ENDPROC(sys_pread_c6x)
+
+ENTRY(sys_pwrite_c6x)
+ MV .D2X A8,B7
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKL .S1 sys_pwrite64,A0
+ MVKH .S1 sys_pwrite64,A0
+ BNOP .S2X A0,5
+#else
+ || B .S2 sys_pwrite64
+ NOP 5
+#endif
+ENDPROC(sys_pwrite_c6x)
+
+;; On Entry
+;; A4 - path
+;; B4 - offset_lo (LE), offset_hi (BE)
+;; A6 - offset_lo (BE), offset_hi (LE)
+ENTRY(sys_truncate64_c6x)
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ MV .S2 B4,B5
+ MV .D2X A6,B4
+#else
+ MV .D2X A6,B5
+#endif
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKL .S1 sys_truncate64,A0
+ MVKH .S1 sys_truncate64,A0
+ BNOP .S2X A0,5
+#else
+ || B .S2 sys_truncate64
+ NOP 5
+#endif
+ENDPROC(sys_truncate64_c6x)
+
+;; On Entry
+;; A4 - fd
+;; B4 - offset_lo (LE), offset_hi (BE)
+;; A6 - offset_lo (BE), offset_hi (LE)
+ENTRY(sys_ftruncate64_c6x)
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ MV .S2 B4,B5
+ MV .D2X A6,B4
+#else
+ MV .D2X A6,B5
+#endif
+#ifdef CONFIG_C6X_BIG_KERNEL
+ || MVKL .S1 sys_ftruncate64,A0
+ MVKH .S1 sys_ftruncate64,A0
+ BNOP .S2X A0,5
+#else
+ || B .S2 sys_ftruncate64
+ NOP 5
+#endif
+ENDPROC(sys_ftruncate64_c6x)
+
+#ifdef __ARCH_WANT_SYSCALL_OFF_T
+;; On Entry
+;; A4 - fd
+;; B4 - offset_lo (LE), offset_hi (BE)
+;; A6 - offset_lo (BE), offset_hi (LE)
+;; B6 - len
+;; A8 - advice
+ENTRY(sys_fadvise64_c6x)
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 sys_fadvise64,A0
+ MVKH .S1 sys_fadvise64,A0
+ BNOP .S2X A0,2
+#else
+ B .S2 sys_fadvise64
+ NOP 2
+#endif
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ MV .L2 B4,B5
+ || MV .D2X A6,B4
+#else
+ MV .D2X A6,B5
+#endif
+ MV .D1X B6,A6
+ MV .D2X A8,B6
+#endif
+ENDPROC(sys_fadvise64_c6x)
+
+;; On Entry
+;; A4 - fd
+;; B4 - offset_lo (LE), offset_hi (BE)
+;; A6 - offset_lo (BE), offset_hi (LE)
+;; B6 - len_lo (LE), len_hi (BE)
+;; A8 - len_lo (BE), len_hi (LE)
+;; B8 - advice
+ENTRY(sys_fadvise64_64_c6x)
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 sys_fadvise64_64,A0
+ MVKH .S1 sys_fadvise64_64,A0
+ BNOP .S2X A0,2
+#else
+ B .S2 sys_fadvise64_64
+ NOP 2
+#endif
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ MV .L2 B4,B5
+ || MV .D2X A6,B4
+ MV .L1 A8,A6
+ || MV .D1X B6,A7
+#else
+ MV .D2X A6,B5
+ MV .L1 A8,A7
+ || MV .D1X B6,A6
+#endif
+ MV .L2 B8,B6
+ENDPROC(sys_fadvise64_64_c6x)
+
+;; On Entry
+;; A4 - fd
+;; B4 - mode
+;; A6 - offset_hi
+;; B6 - offset_lo
+;; A8 - len_hi
+;; B8 - len_lo
+ENTRY(sys_fallocate_c6x)
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 sys_fallocate,A0
+ MVKH .S1 sys_fallocate,A0
+ BNOP .S2X A0,1
+#else
+ B .S2 sys_fallocate
+ NOP
+#endif
+ MV .D1 A6,A7
+ MV .D1X B6,A6
+ MV .D2X A8,B7
+ MV .D2 B8,B6
+ENDPROC(sys_fallocate_c6x)
+
+ ;; put this in .neardata for faster access when using DSBT mode
+ .section .neardata,"aw",@progbits
+ .global current_ksp
+ .hidden current_ksp
+current_ksp:
+ .word init_thread_union + THREAD_START_SP
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 03:14:55 +0000