Subject: [PATCH 22/33] score: create kernel/ files Makefile head.Sentry.S vmlinux.lds.S

From: Chen Liqin
Date: Wed Aug 26 2009 - 02:39:43 EST

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>From 4ebfca7d8e209d11251fd948118ef721a6edcba2 Mon Sep 17 00:00:00 2001
From: Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
Date: Wed, 26 Aug 2009 10:05:07 +0800
Subject: [PATCH 22/33] score: create kernel/ files Makefile head.S entry.S vmlinux.lds.S

Signed-off-by: Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
---
arch/score/kernel/Makefile | 11 +
arch/score/kernel/entry.S | 501 +++++++++++++++++++++++++++++++++++++++
arch/score/kernel/head.S | 70 ++++++
arch/score/kernel/vmlinux.lds.S | 148 ++++++++++++
4 files changed, 730 insertions(+), 0 deletions(-)
create mode 100644 arch/score/kernel/Makefile
create mode 100644 arch/score/kernel/entry.S
create mode 100644 arch/score/kernel/head.S
create mode 100644 arch/score/kernel/vmlinux.lds.S

diff --git a/arch/score/kernel/Makefile b/arch/score/kernel/Makefile
new file mode 100644
index 0000000..f218673
--- /dev/null
+++ b/arch/score/kernel/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for the Linux/SCORE kernel.
+#
+
+extra-y := head.o vmlinux.lds
+
+obj-y += entry.o init_task.o irq.o process.o ptrace.o \
+ setup.o signal.o sys_score.o time.o traps.o \
+ sys_call_table.o
+
+obj-$(CONFIG_MODULES) += module.o
diff --git a/arch/score/kernel/entry.S b/arch/score/kernel/entry.S
new file mode 100644
index 0000000..10e859d
--- /dev/null
+++ b/arch/score/kernel/entry.S
@@ -0,0 +1,501 @@
+/*
+ * arch/score/kernel/entry.S
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
+ * Lennox Wu <lennox.wu@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+
+#include <asm/asmmacro.h>
+#include <asm/thread_info.h>
+#include <asm/unistd.h>
+
+/*
+ * disable interrupts.
+ */
+.macro disable_irq
+ mfcr r8, cr0
+ srli r8, r8, 1
+ slli r8, r8, 1
+ mtcr r8, cr0
+ nop
+ nop
+ nop
+ nop
+ nop
+.endm
+
+/*
+ * enable interrupts.
+ */
+.macro enable_irq
+ mfcr r8, cr0
+ ori r8, 1
+ mtcr r8, cr0
+ nop
+ nop
+ nop
+ nop
+ nop
+.endm
+
+__INIT
+ENTRY(debug_exception_vector)
+ nop!
+ nop!
+ nop!
+ nop!
+ nop!
+ nop!
+ nop!
+ nop!
+
+ENTRY(general_exception_vector) # should move to addr 0x200
+ j general_exception
+ nop!
+ nop!
+ nop!
+ nop!
+ nop!
+ nop!
+
+ENTRY(interrupt_exception_vector) # should move to addr 0x210
+ j interrupt_exception
+ nop!
+ nop!
+ nop!
+ nop!
+ nop!
+ nop!
+
+ .section ".text", "ax"
+ .align 2;
+general_exception:
+ mfcr r31, cr2
+ nop
+ la r30, exception_handlers
+ andi r31, 0x1f # get ecr.exc_code
+ slli r31, r31, 2
+ add r30, r30, r31
+ lw r30, [r30]
+ br r30
+
+interrupt_exception:
+ SAVE_ALL
+ mfcr r4, cr2
+ nop
+ lw r16, [r28, TI_REGS]
+ sw r0, [r28, TI_REGS]
+ la r3, ret_from_irq
+ srli r4, r4, 18 # get ecr.ip[7:2], interrupt No.
+ mv r5, r0
+ j do_IRQ
+
+ENTRY(handle_nmi) # NMI #1
+ SAVE_ALL
+ mv r4, r0
+ la r8, nmi_exception_handler
+ brl r8
+ j restore_all
+
+ENTRY(handle_adelinsn) # AdEL-instruction #2
+ SAVE_ALL
+ mfcr r8, cr6
+ nop
+ nop
+ sw r8, [r0, PT_EMA]
+ mv r4, r0
+ la r8, do_adelinsn
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_ibe) # BusEL-instruction #5
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_be
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_pel) # P-EL #6
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_pel
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_ccu) # CCU #8
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_ccu
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_ri) # RI #9
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_ri
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_tr) # Trap #10
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_tr
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_adedata) # AdES-instruction #12
+ SAVE_ALL
+ mfcr r8, cr6
+ nop
+ nop
+ sw r8, [r0, PT_EMA]
+ mv r4, r0
+ la r8, do_adedata
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_cee) # CeE #16
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_cee
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_cpe) # CpE #17
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_cpe
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_dbe) # BusEL-data #18
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_be
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+ENTRY(handle_reserved) # others
+ SAVE_ALL
+ mv r4, r0
+ la r8, do_reserved
+ brl r8
+ mv r4, r0
+ j ret_from_exception
+ nop
+
+#ifndef CONFIG_PREEMPT
+#define resume_kernel restore_all
+#else
+#define __ret_from_irq ret_from_exception
+#endif
+
+ .align 2
+#ifndef CONFIG_PREEMPT
+ENTRY(ret_from_exception)
+ disable_irq # preempt stop
+ nop
+ j __ret_from_irq
+ nop
+#endif
+
+ENTRY(ret_from_irq)
+ sw r16, [r28, TI_REGS]
+
+ENTRY(__ret_from_irq)
+ lw r8, [r0, PT_PSR] # returning to kernel mode?
+ andri.c r8, r8, KU_USER
+ beq resume_kernel
+
+resume_userspace:
+ disable_irq
+ lw r6, [r28, TI_FLAGS] # current->work
+ li r8, _TIF_WORK_MASK
+ and.c r8, r8, r6 # ignoring syscall_trace
+ bne work_pending
+ nop
+ j restore_all
+ nop
+
+#ifdef CONFIG_PREEMPT
+resume_kernel:
+ disable_irq
+ lw r8, [r28, TI_PRE_COUNT]
+ cmpz.c r8
+ bne r8, restore_all
+need_resched:
+ lw r8, [r28, TI_FLAGS]
+ andri.c r9, r8, _TIF_NEED_RESCHED
+ beq restore_all
+ lw r8, [r28, PT_PSR] # Interrupts off?
+ andri.c r8, r8, 1
+ beq restore_all
+ bl preempt_schedule_irq
+ nop
+ j need_resched
+ nop
+#endif
+
+ENTRY(ret_from_fork)
+ bl schedule_tail # r4=struct task_struct *prev
+
+ENTRY(syscall_exit)
+ nop
+ disable_irq
+ lw r6, [r28, TI_FLAGS] # current->work
+ li r8, _TIF_WORK_MASK
+ and.c r8, r6, r8
+ bne syscall_exit_work
+
+ENTRY(restore_all) # restore full frame
+ RESTORE_ALL_AND_RET
+
+work_pending:
+ andri.c r8, r6, _TIF_NEED_RESCHED # r6 is preloaded with TI_FLAGS
+ beq work_notifysig
+work_resched:
+ bl schedule
+ nop
+ disable_irq
+ lw r6, [r28, TI_FLAGS]
+ li r8, _TIF_WORK_MASK
+ and.c r8, r6, r8 # is there any work to be done
+ # other than syscall tracing?
+ beq restore_all
+ andri.c r8, r6, _TIF_NEED_RESCHED
+ bne work_resched
+
+work_notifysig:
+ mv r4, r0
+ li r5, 0
+ bl do_notify_resume # r6 already loaded
+ nop
+ j resume_userspace
+ nop
+
+ENTRY(syscall_exit_work)
+ li r8, _TIF_SYSCALL_TRACE
+ and.c r8, r8, r6 # r6 is preloaded with TI_FLAGS
+ beq work_pending # trace bit set?
+ nop
+ enable_irq
+ mv r4, r0
+ li r5, 1
+ bl do_syscall_trace
+ nop
+ b resume_userspace
+ nop
+
+.macro save_context reg
+ sw r12, [\reg, THREAD_REG12];
+ sw r13, [\reg, THREAD_REG13];
+ sw r14, [\reg, THREAD_REG14];
+ sw r15, [\reg, THREAD_REG15];
+ sw r16, [\reg, THREAD_REG16];
+ sw r17, [\reg, THREAD_REG17];
+ sw r18, [\reg, THREAD_REG18];
+ sw r19, [\reg, THREAD_REG19];
+ sw r20, [\reg, THREAD_REG20];
+ sw r21, [\reg, THREAD_REG21];
+ sw r29, [\reg, THREAD_REG29];
+ sw r2, [\reg, THREAD_REG2];
+ sw r0, [\reg, THREAD_REG0]
+.endm
+
+.macro restore_context reg
+ lw r12, [\reg, THREAD_REG12];
+ lw r13, [\reg, THREAD_REG13];
+ lw r14, [\reg, THREAD_REG14];
+ lw r15, [\reg, THREAD_REG15];
+ lw r16, [\reg, THREAD_REG16];
+ lw r17, [\reg, THREAD_REG17];
+ lw r18, [\reg, THREAD_REG18];
+ lw r19, [\reg, THREAD_REG19];
+ lw r20, [\reg, THREAD_REG20];
+ lw r21, [\reg, THREAD_REG21];
+ lw r29, [\reg, THREAD_REG29];
+ lw r0, [\reg, THREAD_REG0];
+ lw r2, [\reg, THREAD_REG2];
+ lw r3, [\reg, THREAD_REG3]
+.endm
+
+/*
+ * task_struct *resume(task_struct *prev, task_struct *next,
+ * struct thread_info *next_ti)
+ */
+ENTRY(resume)
+ mfcr r9, cr0
+ nop
+ nop
+ sw r9, [r4, THREAD_PSR]
+ save_context r4
+ sw r3, [r4, THREAD_REG3]
+
+ mv r28, r6
+ restore_context r5
+ mv r8, r6
+ addi r8, KERNEL_STACK_SIZE
+ subi r8, 32
+ la r9, kernelsp;
+ sw r8, [r9];
+
+ mfcr r9, cr0
+ ldis r7, 0x00ff
+ nop
+ and r9, r9, r7
+ lw r6, [r5, THREAD_PSR]
+ not r7, r7
+ and r6, r6, r7
+ or r6, r6, r9
+ mtcr r6, cr0
+ nop; nop; nop; nop; nop
+ br r3
+
+ENTRY(handle_sys)
+ SAVE_ALL
+ sw r8, [r0, 16] # argument 5 from user r8
+ sw r9, [r0, 20] # argument 6 from user r9
+ enable_irq
+
+ sw r4, [r0, PT_ORIG_R4] #for restart syscall
+ sw r7, [r0, PT_ORIG_R7] #for restart syscall
+ sw r27, [r0, PT_IS_SYSCALL] # it from syscall
+
+ lw r9, [r0, PT_EPC] # skip syscall on return
+ addi r9, 4
+ sw r9, [r0, PT_EPC]
+
+ cmpi.c r27, __NR_syscalls # check syscall number
+ bgtu illegal_syscall
+
+ slli r8, r27, 2 # get syscall routine
+ la r11, sys_call_table
+ add r11, r11, r8
+ lw r10, [r11] # get syscall entry
+
+ cmpz.c r10
+ beq illegal_syscall
+
+ lw r8, [r28, TI_FLAGS]
+ li r9, _TIF_SYSCALL_TRACE
+ and.c r8, r8, r9
+ bne syscall_trace_entry
+
+ brl r10 # Do The Real system call
+
+ cmpi.c r4, 0
+ blt 1f
+ ldi r8, 0
+ sw r8, [r0, PT_R7]
+ b 2f
+1:
+ cmpi.c r4, -MAX_ERRNO - 1
+ ble 2f
+ ldi r8, 0x1;
+ sw r8, [r0, PT_R7]
+ neg r4, r4
+2:
+ sw r4, [r0, PT_R4] # save result
+
+syscall_return:
+ disable_irq
+ lw r6, [r28, TI_FLAGS] # current->work
+ li r8, _TIF_WORK_MASK
+ and.c r8, r6, r8
+ bne syscall_return_work
+ j restore_all
+
+syscall_return_work:
+ j syscall_exit_work
+
+syscall_trace_entry:
+ mv r16, r10
+ mv r4, r0
+ li r5, 0
+ bl do_syscall_trace
+
+ mv r8, r16
+ lw r4, [r0, PT_R4] # Restore argument registers
+ lw r5, [r0, PT_R5]
+ lw r6, [r0, PT_R6]
+ lw r7, [r0, PT_R7]
+ brl r8
+
+ li r8, -MAX_ERRNO - 1
+ sw r8, [r0, PT_R7] # set error flag
+
+ neg r4, r4 # error
+ sw r4, [r0, PT_R0] # set flag for syscall
+ # restarting
+1: sw r4, [r0, PT_R2] # result
+ j syscall_exit
+
+illegal_syscall:
+ ldi r4, -ENOSYS # error
+ sw r4, [r0, PT_ORIG_R4]
+ sw r4, [r0, PT_R4]
+ ldi r9, 1 # set error flag
+ sw r9, [r0, PT_R7]
+ j syscall_return
+
+ENTRY(sys_execve)
+ mv r4, r0
+ la r8, score_execve
+ br r8
+
+ENTRY(sys_clone)
+ mv r4, r0
+ la r8, score_clone
+ br r8
+
+ENTRY(sys_rt_sigreturn)
+ mv r4, r0
+ la r8, score_rt_sigreturn
+ br r8
+
+ENTRY(sys_sigaltstack)
+ mv r4, r0
+ la r8, score_sigaltstack
+ br r8
diff --git a/arch/score/kernel/head.S b/arch/score/kernel/head.S
new file mode 100644
index 0000000..22a7e3c
--- /dev/null
+++ b/arch/score/kernel/head.S
@@ -0,0 +1,70 @@
+/*
+ * arch/score/kernel/head.S
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
+ * Lennox Wu <lennox.wu@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/init.h>
+#include <linux/linkage.h>
+
+#include <asm/asm-offsets.h>
+
+ .extern start_kernel
+ .global init_thread_union
+ .global kernelsp
+
+__INIT
+ENTRY(_stext)
+ la r30, __bss_start /* initialize BSS segment. */
+ la r31, _end
+ xor r8, r8, r8
+
+1: cmp.c r31, r30
+ beq 2f
+
+ sw r8, [r30] /* clean memory. */
+ addi r30, 4
+ b 1b
+
+2: la r28, init_thread_union /* set kernel stack. */
+ mv r0, r28
+ addi r0, KERNEL_STACK_SIZE - 32
+ la r30, kernelsp
+ sw r0, [r30]
+ subi r0, 4*4
+ xor r30, r30, r30
+ ori r30, 0x02 /* enable MMU. */
+ mtcr r30, cr4
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ /* there is no parameter */
+ xor r4, r4, r4
+ xor r5, r5, r5
+ xor r6, r6, r6
+ xor r7, r7, r7
+ la r30, start_kernel /* jump to init_arch */
+ br r30
diff --git a/arch/score/kernel/vmlinux.lds.S b/arch/score/kernel/vmlinux.lds.S
new file mode 100644
index 0000000..f855698
--- /dev/null
+++ b/arch/score/kernel/vmlinux.lds.S
@@ -0,0 +1,148 @@
+/*
+ * arch/score/kernel/vmlinux.lds.S
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
+ * Lennox Wu <lennox.wu@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <asm-generic/vmlinux.lds.h>
+
+OUTPUT_ARCH(score)
+ENTRY(_stext)
+
+jiffies = jiffies_64;
+
+SECTIONS
+{
+ . = CONFIG_MEMORY_START + 0x2000;
+ /* read-only */
+ .text : {
+ _text = .; /* Text and read-only data */
+ TEXT_TEXT
+ SCHED_TEXT
+ LOCK_TEXT
+ KPROBES_TEXT
+ *(.text.*)
+ *(.fixup)
+ . = ALIGN (4) ;
+ _etext = .; /* End of text section */
+ }
+
+ . = ALIGN(16);
+ RODATA
+
+ /* Exception table */
+ . = ALIGN(16);
+ __ex_table : {
+ __start___ex_table = .;
+ *(__ex_table)
+ __stop___ex_table = .;
+ }
+
+ /* writeable */
+ .data ALIGN (4096): {
+ *(.data.init_task)
+
+ DATA_DATA
+ CONSTRUCTORS
+ }
+
+ /* We want the small data sections together, so single-instruction offsets
+ can access them all, and initialized data all before uninitialized, so
+ we can shorten the on-disk segment size. */
+ . = ALIGN(8);
+ .sdata : {
+ *(.sdata)
+ }
+
+ . = ALIGN(32);
+ .data.cacheline_aligned : {
+ *(.data.cacheline_aligned)
+ }
+ _edata = .; /* End of data section */
+
+ /* will be freed after init */
+ . = ALIGN(4096); /* Init code and data */
+ __init_begin = .;
+
+ . = ALIGN(4096);
+ .init.text : {
+ _sinittext = .;
+ INIT_TEXT
+ _einittext = .;
+ }
+ .init.data : {
+ INIT_DATA
+ }
+ . = ALIGN(16);
+ .init.setup : {
+ __setup_start = .;
+ *(.init.setup)
+ __setup_end = .;
+ }
+
+ .initcall.init : {
+ __initcall_start = .;
+ INITCALLS
+ __initcall_end = .;
+ }
+
+ .con_initcall.init : {
+ __con_initcall_start = .;
+ *(.con_initcall.init)
+ __con_initcall_end = .;
+ }
+ SECURITY_INIT
+
+ /* .exit.text is discarded at runtime, not link time, to deal with
+ * references from .rodata
+ */
+ .exit.text : {
+ EXIT_TEXT
+ }
+ .exit.data : {
+ EXIT_DATA
+ }
+#if defined(CONFIG_BLK_DEV_INITRD)
+ .init.ramfs ALIGN(4096): {
+ __initramfs_start = .;
+ *(.init.ramfs)
+ __initramfs_end = .;
+ . = ALIGN(4);
+ LONG(0);
+ }
+#endif
+ . = ALIGN(4096);
+ __init_end = .;
+ /* freed after init ends here */
+
+ __bss_start = .; /* BSS */
+ .sbss : {
+ *(.sbss)
+ *(.scommon)
+ }
+ .bss : {
+ *(.bss)
+ *(COMMON)
+ }
+ __bss_stop = .;
+ _end = .;
+}
--
1.6.2

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