Subject: [PATCH 26/33] score: create kernel/ files module.cprocess.c

[Chen Liqin]

>From e81819ad4d18ca9d70c9153565c94f8392e00333 Mon Sep 17 00:00:00 2001
From: Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
Date: Wed, 26 Aug 2009 10:05:09 +0800
Subject: [PATCH 26/33] score: create kernel/ files module.c process.c


Signed-off-by: Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
---
 arch/score/kernel/module.c  |  165 ++++++++++++++++++++++++++++++++++++++++++
 arch/score/kernel/process.c |  168 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 333 insertions(+), 0 deletions(-)
 create mode 100644 arch/score/kernel/module.c
 create mode 100644 arch/score/kernel/process.c

diff --git a/arch/score/kernel/module.c b/arch/score/kernel/module.c
new file mode 100644
index 0000000..4de8d47
--- /dev/null
+++ b/arch/score/kernel/module.c
@@ -0,0 +1,165 @@
+/*
+ * arch/score/kernel/module.c
+ *
+ * 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/moduleloader.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+
+void *module_alloc(unsigned long size)
+{
+	return size ? vmalloc(size) : NULL;
+}
+
+/* Free memory returned from module_alloc */
+void module_free(struct module *mod, void *module_region)
+{
+	vfree(module_region);
+}
+
+int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
+			char *secstrings, struct module *mod)
+{
+	return 0;
+}
+
+int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
+		unsigned int symindex, unsigned int relindex,
+		struct module *me)
+{
+	Elf32_Shdr *symsec = sechdrs + symindex;
+	Elf32_Shdr *relsec = sechdrs + relindex;
+	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
+	Elf32_Rel *rel = (void *)relsec->sh_addr;
+	unsigned int i;
+
+	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
+		unsigned long loc;
+		Elf32_Sym *sym;
+		s32 r_offset;
+
+		r_offset = ELF32_R_SYM(rel->r_info);
+		if ((r_offset < 0) ||
+		    (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
+			printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
+				me->name, relindex, i);
+				return -ENOEXEC;
+		}
+
+		sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset;
+
+		if ((rel->r_offset < 0) ||
+		    (rel->r_offset > dstsec->sh_size - sizeof(u32))) {
+			printk(KERN_ERR "%s: out of bounds relocation, "
+				"section %d reloc %d offset %d size %d\n",
+				me->name, relindex, i, rel->r_offset,
+				dstsec->sh_size);
+			return -ENOEXEC;
+		}
+
+		loc = dstsec->sh_addr + rel->r_offset;
+		switch (ELF32_R_TYPE(rel->r_info)) {
+		case R_SCORE_NONE:
+			break;
+		case R_SCORE_ABS32:
+			*(unsigned long *)loc += sym->st_value;
+			break;
+		case R_SCORE_HI16:
+			break;
+		case R_SCORE_LO16: {
+			unsigned long hi16_offset, offset;
+			unsigned long uvalue;
+			unsigned long temp, temp_hi;
+			temp_hi = *((unsigned long *)loc - 1);
+			temp = *(unsigned long *)loc;
+
+			hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) |
+					((temp_hi) & 0x7fff)) >> 1;
+			offset = ((temp >> 16 & 0x03) << 15) |
+					((temp & 0x7fff) >> 1);
+			offset = (hi16_offset << 16) | (offset & 0xffff);
+			uvalue = sym->st_value + offset;
+			hi16_offset = (uvalue >> 16) << 1;
+
+			temp_hi = ((temp_hi) & (~(0x37fff))) |
+					(hi16_offset & 0x7fff) |
+					((hi16_offset << 1) & 0x30000);
+			*((unsigned long *)loc - 1) = temp_hi;
+
+			offset = (uvalue & 0xffff) << 1;
+			temp = (temp & (~(0x37fff))) | (offset & 0x7fff) |
+				((offset << 1) & 0x30000);
+			*(unsigned long *)loc = temp;
+			break;
+		}
+		case R_SCORE_24: {
+			unsigned long hi16_offset, offset;
+			unsigned long uvalue;
+			unsigned long temp;
+
+			temp = *(unsigned long *)loc;
+			offset = (temp & 0x03FF7FFE);
+			hi16_offset = (offset & 0xFFFF0000);
+			offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2;
+
+			uvalue = (sym->st_value + offset) >> 1;
+			uvalue = uvalue & 0x00ffffff;
+
+			temp = (temp & 0xfc008001) |
+				((uvalue << 2) & 0x3ff0000) |
+				((uvalue & 0x3fff) << 1);
+			*(unsigned long *)loc = temp;
+			break;
+		}
+		default:
+			printk(KERN_ERR "%s: unknown relocation: %u\n",
+				me->name, ELF32_R_TYPE(rel->r_info));
+			return -ENOEXEC;
+		}
+	}
+
+	return 0;
+}
+
+int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
+		unsigned int symindex, unsigned int relsec,
+		struct module *me)
+{
+	return 0;
+}
+
+/* Given an address, look for it in the module exception tables. */
+const struct exception_table_entry *search_module_dbetables(unsigned long addr)
+{
+	return NULL;
+}
+
+/* Put in dbe list if necessary. */
+int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
+		struct module *me)
+{
+	return 0;
+}
+
+void module_arch_cleanup(struct module *mod) {}
diff --git a/arch/score/kernel/process.c b/arch/score/kernel/process.c
new file mode 100644
index 0000000..25d0803
--- /dev/null
+++ b/arch/score/kernel/process.c
@@ -0,0 +1,168 @@
+/*
+ * arch/score/kernel/process.c
+ *
+ * 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/module.h>
+#include <linux/reboot.h>
+#include <linux/elfcore.h>
+#include <linux/pm.h>
+
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+/* If or when software machine-restart is implemented, add code here. */
+void machine_restart(char *command) {}
+
+/* If or when software machine-halt is implemented, add code here. */
+void machine_halt(void) {}
+
+/* If or when software machine-power-off is implemented, add code here. */
+void machine_power_off(void) {}
+
+/*
+ * The idle thread. There's no useful work to be
+ * done, so just try to conserve power and have a
+ * low exit latency (ie sit in a loop waiting for
+ * somebody to say that they'd like to reschedule)
+ */
+void __noreturn cpu_idle(void)
+{
+	/* endless idle loop with no priority at all */
+	while (1) {
+		while (!need_resched())
+			barrier();
+
+		preempt_enable_no_resched();
+		schedule();
+		preempt_disable();
+	}
+}
+
+void ret_from_fork(void);
+
+void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
+{
+	unsigned long status;
+
+	/* New thread loses kernel privileges. */
+	status = regs->cp0_psr & ~(KU_MASK);
+	status |= KU_USER;
+	regs->cp0_psr = status;
+	regs->cp0_epc = pc;
+	regs->regs[0] = sp;
+}
+
+void exit_thread(void) {}
+
+/*
+ * When a process does an "exec", machine state like FPU and debug
+ * registers need to be reset.  This is a hook function for that.
+ * Currently we don't have any such state to reset, so this is empty.
+ */
+void flush_thread(void) {}
+
+/*
+ * set up the kernel stack and exception frames for a new process
+ */
+int copy_thread(unsigned long clone_flags, unsigned long usp,
+		unsigned long unused,
+		struct task_struct *p, struct pt_regs *regs)
+{
+	struct thread_info *ti = task_thread_info(p);
+	struct pt_regs *childregs = task_pt_regs(p);
+
+	p->set_child_tid = NULL;
+	p->clear_child_tid = NULL;
+
+	*childregs = *regs;
+	childregs->regs[7] = 0;		/* Clear error flag */
+	childregs->regs[4] = 0;		/* Child gets zero as return value */
+	regs->regs[4] = p->pid;
+
+	if (childregs->cp0_psr & 0x8) {	/* test kernel fork or user fork */
+		childregs->regs[0] = usp;		/* user fork */
+	} else {
+		childregs->regs[28] = (unsigned long) ti; /* kernel fork */
+		childregs->regs[0] = (unsigned long) childregs;
+	}
+
+	p->thread.reg0 = (unsigned long) childregs;
+	p->thread.reg3 = (unsigned long) ret_from_fork;
+	p->thread.cp0_psr = 0;
+
+	return 0;
+}
+
+/* Fill in the fpu structure for a core dump. */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
+{
+	return 1;
+}
+
+static void __noreturn
+kernel_thread_helper(void *unused0, int (*fn)(void *),
+		 void *arg, void *unused1)
+{
+	do_exit(fn(arg));
+}
+
+/*
+ * Create a kernel thread.
+ */
+long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
+{
+	struct pt_regs regs;
+
+	memset(&regs, 0, sizeof(regs));
+
+	regs.regs[6] = (unsigned long) arg;
+	regs.regs[5] = (unsigned long) fn;
+	regs.cp0_epc = (unsigned long) kernel_thread_helper;
+	regs.cp0_psr = (regs.cp0_psr & ~(0x1|0x4|0x8)) | \
+			((regs.cp0_psr & 0x3) << 2);
+
+	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, \
+			0, &regs, 0, NULL, NULL);
+}
+
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+	return task_pt_regs(tsk)->cp0_epc;
+}
+
+unsigned long get_wchan(struct task_struct *task)
+{
+	if (!task || task == current || task->state == TASK_RUNNING)
+		return 0;
+
+	if (!task_stack_page(task))
+		return 0;
+
+	return task_pt_regs(task)->cp0_epc;
+}
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+	return sp;
+}
-- 
1.6.2



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