/* * Low-level system-call handling, trap handlers and context-switching * * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> * Copyright (C) 2001,2002 NEC Corporation * Copyright (C) 2001,2002 Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. * * Written by Miles Bader <miles@gnu.org> * Heavily modified by John Williams for Microblaze
*/
/* * Various ways of setting and clearing BIP in flags reg. * This is mucky, but necessary using microblaze version that * allows msr ops to write to BIP
*/
#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
.macro clear_bip
msrclr r0, MSR_BIP
.endm
/* Define how to call high-level functions. With MMU, virtual mode must be * enabled when calling the high-level function. Clobbers R11. * VM_ON, VM_OFF, DO_JUMP_BIPCLR, DO_CALL
*/
/* turn on virtual protected mode save */
#define VM_ON \
set_ums; \
rted r0, 2f; \
nop; \
2:
/* turn off virtual protected mode save and user mode save*/
#define VM_OFF \
clear_vms_ums; \
rted r0, TOPHYS(1f); \
nop; \
1:
/* * User trap. * * System calls are handled here. * * Syscall protocol: * Syscall number in r12, args in r5-r10 * Return value in r3 * * Trap entered via brki instruction, so BIP bit is set, and interrupts * are masked. This is nice, means we don't have to CLI before state save
*/
C_ENTRY(_user_exception):
swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
addi r14, r14, 4 /* return address is 4 byte after call */
lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
tophys(r1,r1);
lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ /* calculate kernel stack pointer from task struct 8k */
addik r1, r1, THREAD_SIZE;
tophys(r1,r1);
addik r1, r1, -PT_SIZE; /* Make room on the stack. */
SAVE_REGS
swi r0, r1, PT_R3
swi r0, r1, PT_R4
swi r0, r1, PT_MODE; /* Was in user-mode. */
lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
swi r11, r1, PT_R1; /* Store user SP. */
clear_ums;
2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* Save away the syscall number. */
swi r12, r1, PT_R0;
tovirt(r1,r1)
/* where the trap should return need -8 to adjust for rtsd r15, 8*/ /* Jump to the appropriate function for the system call number in r12 * (r12 is not preserved), or return an error if r12 is not valid. The LP * register should point to the location where
* the called function should return. [note that MAKE_SYS_CALL uses label 1] */
/* Step into virtual mode */
rtbd r0, 3f
nop
3:
lwi r11, CURRENT_TASK, TS_THREAD_INFO /* get thread info */
lwi r11, r11, TI_FLAGS /* get flags in thread info */
andi r11, r11, _TIF_WORK_SYSCALL_MASK
beqi r11, 4f
# do_syscall_trace_enter returns the new syscall nr.
addk r12, r0, r3
lwi r5, r1, PT_R5;
lwi r6, r1, PT_R6;
lwi r7, r1, PT_R7;
lwi r8, r1, PT_R8;
lwi r9, r1, PT_R9;
lwi r10, r1, PT_R10;
4: /* Jump to the appropriate function for the system call number in r12 * (r12 is not preserved), or return an error if r12 is not valid. * The LP register should point to the location where the called function
* should return. [note that MAKE_SYS_CALL uses label 1] */ /* See if the system call number is valid */
blti r12, 5f
addi r11, r12, -__NR_syscalls;
bgei r11, 5f; /* Figure out which function to use for this system call. */ /* Note Microblaze barrel shift is optional, so don't rely on it */
add r12, r12, r12; /* convert num -> ptr */
add r12, r12, r12;
addi r30, r0, 1 /* restarts allowed */
#ifdef DEBUG /* Trac syscalls and stored them to syscall_debug_table */ /* The first syscall location stores total syscall number */
lwi r3, r0, syscall_debug_table
addi r3, r3, 1
swi r3, r0, syscall_debug_table
lwi r3, r12, syscall_debug_table
addi r3, r3, 1
swi r3, r12, syscall_debug_table
#endif
# Find and jump into the syscall handler.
lwi r12, r12, sys_call_table /* where the trap should return need -8 to adjust for rtsd r15, 8 */
addi r15, r0, ret_from_trap-8
bra r12
/* The syscall number is invalid, return an error. */
5:
braid ret_from_trap
addi r3, r0, -ENOSYS;
/* Entry point used to return from a syscall/trap */ /* We re-enable BIP bit before state restore */
C_ENTRY(ret_from_trap):
swi r3, r1, PT_R3
swi r4, r1, PT_R4
lwi r11, r1, PT_MODE; /* See if returning to kernel mode, if so, skip resched &c. */
bnei r11, 2f; /* We're returning to user mode, so check for various conditions that
* trigger rescheduling. */ /* FIXME: Restructure all these flag checks. */
lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
lwi r11, r11, TI_FLAGS; /* get flags in thread info */
andi r11, r11, _TIF_WORK_SYSCALL_MASK
beqi r11, 1f
brlid r15, do_syscall_trace_leave
addik r5, r1, PT_R0
1: /* We're returning to user mode, so check for various conditions that
* trigger rescheduling. */ /* get thread info from current task */
lwi r11, CURRENT_TASK, TS_THREAD_INFO;
lwi r19, r11, TI_FLAGS; /* get flags in thread info */
andi r11, r19, _TIF_NEED_RESCHED;
beqi r11, 5f;
/* Maybe handle a signal */
5:
andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME;
beqi r11, 4f; /* Signals to handle, handle them */
addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */
bralid r15, do_notify_resume; /* Handle any signals */
add r6, r30, r0; /* Arg 2: int in_syscall */
add r30, r0, r0 /* no more restarts */
bri 1b
/* Finally, return to user state. */
4: set_bip; /* Ints masked for state restore */
swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1);
RESTORE_REGS_RTBD;
addik r1, r1, PT_SIZE /* Clean up stack space. */
lwi r1, r1, PT_R1 - PT_SIZE;/* Restore user stack pointer. */
bri 6f;
/* Return to kernel state. */
2: set_bip; /* Ints masked for state restore */
VM_OFF;
tophys(r1,r1);
RESTORE_REGS_RTBD;
addik r1, r1, PT_SIZE /* Clean up stack space. */
tovirt(r1,r1);
6:
TRAP_return: /* Make global symbol for debugging */
rtbd r14, 0; /* Instructions to return from an IRQ */
nop;
/* This the initial entry point for a new child thread, with an appropriate stack in place that makes it look like the child is in the middle of a syscall. This function is actually `returned to' from switch_thread (copy_thread makes ret_from_fork the return address in each new thread's
saved context). */
C_ENTRY(ret_from_fork):
bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
add r5, r3, r0; /* switch_thread returns the prev task */ /* ( in the delay slot ) */
brid ret_from_trap; /* Do normal trap return */
add r3, r0, r0; /* Child's fork call should return 0. */
C_ENTRY(ret_from_kernel_thread):
bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
add r5, r3, r0; /* switch_thread returns the prev task */ /* ( in the delay slot ) */
brald r15, r20 /* fn was left in r20 */
addk r5, r0, r19 /* ... and argument - in r19 */
brid ret_from_trap
add r3, r0, r0
C_ENTRY(sys_rt_sigreturn_wrapper):
addik r30, r0, 0 /* no restarts */
brid sys_rt_sigreturn /* Do real work */
addik r5, r1, 0; /* add user context as 1st arg */
/* * HW EXCEPTION rutine start
*/
C_ENTRY(full_exception_trap): /* adjust exception address for privileged instruction
* for finding where is it */
addik r17, r17, -4
SAVE_STATE /* Save registers */ /* PC, before IRQ/trap - this is one instruction above */
swi r17, r1, PT_PC;
tovirt(r1,r1) /* FIXME this can be store directly in PT_ESR reg.
* I tested it but there is a fault */ /* where the trap should return need -8 to adjust for rtsd r15, 8 */
addik r15, r0, ret_from_exc - 8
mfs r6, resr
mfs r7, rfsr; /* save FSR */
mts rfsr, r0; /* Clear sticky fsr */
rted r0, full_exception
addik r5, r1, 0 /* parameter struct pt_regs * regs */
/* * Unaligned data trap. * * Unaligned data trap last on 4k page is handled here. * * Trap entered via exception, so EE bit is set, and interrupts * are masked. This is nice, means we don't have to CLI before state save * * The assembler routine is in "arch/microblaze/kernel/hw_exception_handler.S"
*/
C_ENTRY(unaligned_data_trap): /* MS: I have to save r11 value and then restore it because * set_bit, clear_eip, set_ee use r11 as temp register if MSR * instructions are not used. We don't need to do if MSR instructions * are used and they use r0 instead of r11. * I am using ENTRY_SP which should be primary used only for stack
* pointer saving. */
swi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
set_bip; /* equalize initial state for all possible entries */
clear_eip;
set_ee;
lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
SAVE_STATE /* Save registers.*/ /* PC, before IRQ/trap - this is one instruction above */
swi r17, r1, PT_PC;
tovirt(r1,r1) /* where the trap should return need -8 to adjust for rtsd r15, 8 */
addik r15, r0, ret_from_exc-8
mfs r3, resr /* ESR */
mfs r4, rear /* EAR */
rtbd r0, _unaligned_data_exception
addik r7, r1, 0 /* parameter struct pt_regs * regs */
/* * Page fault traps. * * If the real exception handler (from hw_exception_handler.S) didn't find * the mapping for the process, then we're thrown here to handle such situation. * * Trap entered via exceptions, so EE bit is set, and interrupts * are masked. This is nice, means we don't have to CLI before state save * * Build a standard exception frame for TLB Access errors. All TLB exceptions * will bail out to this point if they can't resolve the lightweight TLB fault. * * The C function called is in "arch/microblaze/mm/fault.c", declared as: * void do_page_fault(struct pt_regs *regs, * unsigned long address, * unsigned long error_code)
*/ /* data and intruction trap - which is choose is resolved int fault.c */
C_ENTRY(page_fault_data_trap):
SAVE_STATE /* Save registers.*/ /* PC, before IRQ/trap - this is one instruction above */
swi r17, r1, PT_PC;
tovirt(r1,r1) /* where the trap should return need -8 to adjust for rtsd r15, 8 */
addik r15, r0, ret_from_exc-8
mfs r6, rear /* parameter unsigned long address */
mfs r7, resr /* parameter unsigned long error_code */
rted r0, do_page_fault
addik r5, r1, 0 /* parameter struct pt_regs * regs */
C_ENTRY(page_fault_instr_trap):
SAVE_STATE /* Save registers.*/ /* PC, before IRQ/trap - this is one instruction above */
swi r17, r1, PT_PC;
tovirt(r1,r1) /* where the trap should return need -8 to adjust for rtsd r15, 8 */
addik r15, r0, ret_from_exc-8
mfs r6, rear /* parameter unsigned long address */
ori r7, r0, 0 /* parameter unsigned long error_code */
rted r0, do_page_fault
addik r5, r1, 0 /* parameter struct pt_regs * regs */
/* Entry point used to return from an exception. */
C_ENTRY(ret_from_exc):
lwi r11, r1, PT_MODE;
bnei r11, 2f; /* See if returning to kernel mode, */ /* ... if so, skip resched &c. */
/* We're returning to user mode, so check for various conditions that
trigger rescheduling. */
1:
lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
lwi r19, r11, TI_FLAGS; /* get flags in thread info */
andi r11, r19, _TIF_NEED_RESCHED;
beqi r11, 5f;
/* Call the scheduler before returning from a syscall/trap. */
bralid r15, schedule; /* Call scheduler */
nop; /* delay slot */
bri 1b
/* Maybe handle a signal */
5: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME;
beqi r11, 4f; /* Signals to handle, handle them */
/* * Handle a signal return; Pending signals should be in r18. * * Not all registers are saved by the normal trap/interrupt entry * points (for instance, call-saved registers (because the normal * C-compiler calling sequence in the kernel makes sure they're * preserved), and call-clobbered registers in the case of * traps), but signal handlers may want to examine or change the * complete register state. Here we save anything not saved by * the normal entry sequence, so that it may be safely restored
* (in a possibly modified form) after do_notify_resume returns. */
addik r5, r1, 0; /* Arg 1: struct pt_regs *regs */
bralid r15, do_notify_resume; /* Handle any signals */
addi r6, r0, 0; /* Arg 2: int in_syscall */
bri 1b
/* Finally, return to user state. */
4: set_bip; /* Ints masked for state restore */
swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1);
lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer. */
bri 6f; /* Return to kernel state. */
2: set_bip; /* Ints masked for state restore */
VM_OFF;
tophys(r1,r1);
RESTORE_REGS_RTBD;
addik r1, r1, PT_SIZE /* Clean up stack space. */
tovirt(r1,r1);
6:
EXC_return: /* Make global symbol for debugging */
rtbd r14, 0; /* Instructions to return from an IRQ */
nop;
/* * HW EXCEPTION rutine end
*/
/* * Hardware maskable interrupts. * * The stack-pointer (r1) should have already been saved to the memory * location PER_CPU(ENTRY_SP).
*/
C_ENTRY(_interrupt): /* MS: we are in physical address */ /* Save registers, switch to proper stack, convert SP to virtual.*/
swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* MS: See if already in kernel mode. */
mfs r1, rmsr
nop
andi r1, r1, MSR_UMS
bnei r1, 1f
/* Kernel-mode state save. */
lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP))
tophys(r1,r1); /* MS: I have in r1 physical address where stack is */ /* save registers */ /* MS: Make room on the stack -> activation record */
addik r1, r1, -PT_SIZE;
SAVE_REGS
brid 2f;
swi r1, r1, PT_MODE; /* 0 - user mode, 1 - kernel mode */
1: /* User-mode state save. */ /* MS: get the saved current */
lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
tophys(r1,r1);
lwi r1, r1, TS_THREAD_INFO;
addik r1, r1, THREAD_SIZE;
tophys(r1,r1); /* save registers */
addik r1, r1, -PT_SIZE;
SAVE_REGS /* calculate mode */
swi r0, r1, PT_MODE;
lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
swi r11, r1, PT_R1;
clear_ums;
2:
lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
tovirt(r1,r1)
addik r15, r0, irq_call;
irq_call:rtbd r0, do_IRQ;
addik r5, r1, 0;
/* MS: we are in virtual mode */
ret_from_irq:
lwi r11, r1, PT_MODE;
bnei r11, 2f;
/* * Break handler for MB Manager. Enter to _xmb_manager_break by * injecting fault in one of the TMR Microblaze core. * FIXME: This break handler supports getting * called from kernel space only.
*/
C_ENTRY(_xmb_manager_break): /* * Reserve memory in the stack for context store/restore * (which includes memory for storing tlbs (max two tlbs))
*/
addik r1, r1, -PT_SIZE - 36
swi r1, r0, xmb_manager_stackpointer
SAVE_REGS
swi r14, r1, PT_R14 /* rewrite saved R14 value */
swi r16, r1, PT_PC; /* PC and r16 are the same */
lwi r6, r0, TOPHYS(xmb_manager_baseaddr)
lwi r7, r0, TOPHYS(xmb_manager_crval) /* * When the break vector gets asserted because of error injection, * the break signal must be blocked before exiting from the * break handler, below code configures the tmr manager * control register to block break signal.
*/
swi r7, r6, 0
/* Save the special purpose registers */
mfs r2, rpid
swi r2, r1, PT_PID
lwi r5, r0, TOPHYS(xmb_manager_dev)
lwi r8, r0, TOPHYS(xmb_manager_callback) /* return from break need -8 to adjust for rtsd r15, 8 */
addik r15, r0, ret_from_break - 8
rtbd r8, 0
nop
ret_from_break: /* flush the d-cache */
bralid r15, mb_flush_dcache
nop
/* * To make sure microblaze i-cache is in a proper state * invalidate the i-cache.
*/
bralid r15, mb_invalidate_icache
nop
set_bip; /* Ints masked for state restore */
VM_OFF;
mbar 1
mbar 2
bri 4
suspend
nop
#endif
/* * Debug trap for KGDB. Enter to _debug_exception by brki r16, 0x18 * and call handling function with saved pt_regs
*/
C_ENTRY(_debug_exception): /* BIP bit is set on entry, no interrupts can occur */
swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP))
/* BIP bit is set on entry, no interrupts can occur */
addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - PT_SIZE;
SAVE_REGS; /* save all regs to pt_reg structure */
swi r0, r1, PT_R0; /* R0 must be saved too */
swi r14, r1, PT_R14 /* rewrite saved R14 value */
swi r16, r1, PT_PC; /* PC and r16 are the same */ /* save special purpose registers to pt_regs */
mfs r11, rear;
swi r11, r1, PT_EAR;
mfs r11, resr;
swi r11, r1, PT_ESR;
mfs r11, rfsr;
swi r11, r1, PT_FSR;
/* stack pointer is in physical address at it is decrease
* by PT_SIZE but we need to get correct R1 value */
addik r11, r1, CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR + PT_SIZE;
swi r11, r1, PT_R1 /* MS: r31 - current pointer isn't changed */
tovirt(r1,r1)
#ifdef CONFIG_KGDB
addi r5, r1, 0 /* pass pt_reg address as the first arg */
addik r15, r0, dbtrap_call; /* return address */
rtbd r0, microblaze_kgdb_break
nop;
#endif /* MS: Place handler for brki from kernel space if KGDB is OFF.
* It is very unlikely that another brki instruction is called. */
bri 0
/* MS: User-mode state save - gdb */
1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
tophys(r1,r1);
lwi r1, r1, TS_THREAD_INFO; /* get the thread info */
addik r1, r1, THREAD_SIZE; /* calculate kernel stack pointer */
tophys(r1,r1);
addik r1, r1, -PT_SIZE; /* Make room on the stack. */
SAVE_REGS;
swi r16, r1, PT_PC; /* Save LP */
swi r0, r1, PT_MODE; /* Was in user-mode. */
lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
swi r11, r1, PT_R1; /* Store user SP. */
lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
tovirt(r1,r1)
set_vms;
addik r5, r1, 0;
addik r15, r0, dbtrap_call;
dbtrap_call: /* Return point for kernel/user entry + 8 because of rtsd r15, 8 */
rtbd r0, sw_exception
nop
/* MS: The first instruction for the second part of the gdb/kgdb */
set_bip; /* Ints masked for state restore */
lwi r11, r1, PT_MODE;
bnei r11, 2f; /* MS: Return to user space - gdb */
1: /* Get current task ptr into r11 */
lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
lwi r19, r11, TI_FLAGS; /* get flags in thread info */
andi r11, r19, _TIF_NEED_RESCHED;
beqi r11, 5f;
/* Call the scheduler before returning from a syscall/trap. */
bralid r15, schedule; /* Call scheduler */
nop; /* delay slot */
bri 1b
/* Maybe handle a signal */
5: andi r11, r19, _TIF_SIGPENDING | _TIF_NOTIFY_RESUME;
beqi r11, 4f; /* Signals to handle, handle them */
/* Finally, return to user state. */
4: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1); /* MS: Restore all regs */
RESTORE_REGS_RTBD
addik r1, r1, PT_SIZE /* Clean up stack space */
lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer */
DBTRAP_return_user: /* MS: Make global symbol for debugging */
rtbd r16, 0; /* MS: Instructions to return from a debug trap */
nop;
/* MS: Return to kernel state - kgdb */
2: VM_OFF;
tophys(r1,r1); /* MS: Restore all regs */
RESTORE_REGS_RTBD
lwi r14, r1, PT_R14;
lwi r16, r1, PT_PC;
addik r1, r1, PT_SIZE; /* MS: Clean up stack space */
tovirt(r1,r1);
DBTRAP_return_kernel: /* MS: Make global symbol for debugging */
rtbd r16, 0; /* MS: Instructions to return from a debug trap */
nop;
ENTRY(_switch_to) /* prepare return value */
addk r3, r0, CURRENT_TASK
/* save registers in cpu_context */ /* use r11 and r12, volatile registers, as temp register */ /* give start of cpu_context for previous process */
addik r11, r5, TI_CPU_CONTEXT
swi r1, r11, CC_R1
swi r2, r11, CC_R2 /* skip volatile registers.
* they are saved on stack when we jumped to _switch_to() */ /* dedicated registers */
swi r13, r11, CC_R13
swi r14, r11, CC_R14
swi r15, r11, CC_R15
swi r16, r11, CC_R16
swi r17, r11, CC_R17
swi r18, r11, CC_R18 /* save non-volatile registers */
swi r19, r11, CC_R19
swi r20, r11, CC_R20
swi r21, r11, CC_R21
swi r22, r11, CC_R22
swi r23, r11, CC_R23
swi r24, r11, CC_R24
swi r25, r11, CC_R25
swi r26, r11, CC_R26
swi r27, r11, CC_R27
swi r28, r11, CC_R28
swi r29, r11, CC_R29
swi r30, r11, CC_R30 /* special purpose registers */
mfs r12, rmsr
swi r12, r11, CC_MSR
mfs r12, rear
swi r12, r11, CC_EAR
mfs r12, resr
swi r12, r11, CC_ESR
mfs r12, rfsr
swi r12, r11, CC_FSR
/* update r31, the current-give me pointer to task which will be next */
lwi CURRENT_TASK, r6, TI_TASK /* stored it to current_save too */
swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE)
/* get new process' cpu context and restore */ /* give me start where start context of next task */
addik r11, r6, TI_CPU_CONTEXT
/* * When the break vector gets asserted because of error injection, * the break signal must be blocked before exiting from the * break handler, Below api updates the manager address and * control register and error count callback arguments, * which will be used by the break handler to block the * break and call the callback function.
*/
.global xmb_manager_register
.section .text
.align 2
.ent xmb_manager_register
.type xmb_manager_register, @function
xmb_manager_register:
swi r5, r0, xmb_manager_baseaddr
swi r6, r0, xmb_manager_crval
swi r7, r0, xmb_manager_callback
swi r8, r0, xmb_manager_dev
swi r9, r0, xmb_manager_reset_callback
ENTRY(_reset)
VM_OFF
brai 0; /* Jump to reset vector */
/* These are compiled and loaded into high memory, then
* copied into place in mach_early_setup */
.section .init.ivt, "ax"
#if CONFIG_MANUAL_RESET_VECTOR && !defined(CONFIG_MB_MANAGER)
.org 0x0
brai CONFIG_MANUAL_RESET_VECTOR
#elif defined(CONFIG_MB_MANAGER)
.org 0x0
brai TOPHYS(_xtmr_manager_reset);
#endif
.org 0x8
brai TOPHYS(_user_exception); /* syscall handler */
.org 0x10
brai TOPHYS(_interrupt); /* Interrupt handler */
#ifdef CONFIG_MB_MANAGER
.org 0x18
brai TOPHYS(_xmb_manager_break); /* microblaze manager break handler */
#else
.org 0x18
brai TOPHYS(_debug_exception); /* debug trap handler */
#endif
.org 0x20
brai TOPHYS(_hw_exception_handler); /* HW exception handler */
#ifdef CONFIG_MB_MANAGER /* * For TMR Inject API which injects the error should * be executed from LMB. * TMR Inject is programmed with address of 0x200 so that * when program counter matches with this address error will * be injected. 0x200 is expected to be next available bram * offset, hence used for this api.
*/
.org XMB_INJECT_ERR_OFFSET
xmb_inject_error:
nop
rtsd r15, 8
nop
#endif
/* * Trap decoding for stack unwinder * Tuples are (start addr, end addr, string) * If return address lies on [start addr, end addr], * unwinder displays 'string'
*/
.align 4
.global microblaze_trap_handlers
microblaze_trap_handlers: /* Exact matches come first */
.word ret_from_trap; .word ret_from_trap ; .word type_SYSCALL
.word ret_from_irq ; .word ret_from_irq ; .word type_IRQ /* Fuzzy matches go here */
.word ret_from_irq ; .word no_intr_resched ; .word type_IRQ_PREEMPT
.word ret_from_trap; .word TRAP_return ; .word type_SYSCALL_PREEMPT /* End of table */
.word 0 ; .word 0 ; .word 0
Messung V0.5
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