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Subject[PATCH 21/27] score: create kernel files ptrace.c setup.c
From
Date
From a9cf36c1ebacdd02a6d7ccd91920fc5edd65ffcc Mon Sep 17 00:00:00 2001
From: Chen Liqin <liqin.chen@sunplusct.com>
Date: Tue, 9 Jun 2009 13:43:17 +0800
Subject: [PATCH 21/27] score: create kernel files ptrace.c setup.c


Signed-off-by: Chen Liqin <liqin.chen@sunplusct.com>
---
arch/score/kernel/ptrace.c | 465
++++++++++++++++++++++++++++++++++++++++++++
arch/score/kernel/setup.c | 156 +++++++++++++++
2 files changed, 621 insertions(+), 0 deletions(-)
create mode 100644 arch/score/kernel/ptrace.c
create mode 100644 arch/score/kernel/setup.c

diff --git a/arch/score/kernel/ptrace.c b/arch/score/kernel/ptrace.c
new file mode 100644
index 0000000..8fe7209
--- /dev/null
+++ b/arch/score/kernel/ptrace.c
@@ -0,0 +1,465 @@
+/*
+ * arch/score/kernel/ptrace.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@sunplusct.com>
+ * Lennox Wu <lennox.wu@sunplusct.com>
+ *
+ * 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/kernel.h>
+#include <linux/ptrace.h>
+
+#include <asm/uaccess.h>
+
+static int is_16bitinsn(unsigned long insn)
+{
+ if ((insn & INSN32_MASK) == INSN32_MASK)
+ return 0;
+ else
+ return 1;
+}
+
+int
+read_tsk_long(struct task_struct *child,
+ unsigned long addr, unsigned long *res)
+{
+ int copied;
+
+ copied = access_process_vm(child, addr, res, sizeof(*res), 0);
+
+ return copied != sizeof(*res) ? -EIO : 0;
+}
+
+int
+read_tsk_short(struct task_struct *child,
+ unsigned long addr, unsigned short *res)
+{
+ int copied;
+
+ copied = access_process_vm(child, addr, res, sizeof(*res), 0);
+
+ return copied != sizeof(*res) ? -EIO : 0;
+}
+
+static int
+write_tsk_short(struct task_struct *child,
+ unsigned long addr, unsigned short val)
+{
+ int copied;
+
+ copied = access_process_vm(child, addr, &val, sizeof(val), 1);
+
+ return copied != sizeof(val) ? -EIO : 0;
+}
+
+static int
+write_tsk_long(struct task_struct *child,
+ unsigned long addr, unsigned long val)
+{
+ int copied;
+
+ copied = access_process_vm(child, addr, &val, sizeof(val), 1);
+
+ return copied != sizeof(val) ? -EIO : 0;
+}
+
+void set_single_step(struct task_struct *child)
+{
+ /* far_epc is the target of branch */
+ unsigned int epc, far_epc = 0;
+ unsigned long epc_insn, far_epc_insn;
+ int ninsn_type; /* next insn type 0=16b, 1=32b */
+ unsigned int tmp, tmp2;
+ struct pt_regs *regs = task_pt_regs(child);
+ child->thread.single_step = 1;
+ child->thread.ss_nextcnt = 1;
+ epc = regs->cp0_epc;
+
+ read_tsk_long(child, epc, &epc_insn);
+
+ if (is_16bitinsn(epc_insn)) {
+ if ((epc_insn & J16M) == J16) {
+ tmp = epc_insn & 0xFFE;
+ epc = (epc & 0xFFFFF000) | tmp;
+ } else if ((epc_insn & B16M) == B16) {
+ child->thread.ss_nextcnt = 2;
+ tmp = (epc_insn & 0xFF) << 1;
+ tmp = tmp << 23;
+ tmp = (unsigned int)((int) tmp >> 23);
+ far_epc = epc + tmp;
+ epc += 2;
+ } else if ((epc_insn & BR16M) == BR16) {
+ child->thread.ss_nextcnt = 2;
+ tmp = (epc_insn >> 4) & 0xF;
+ far_epc = regs->regs[tmp];
+ epc += 2;
+ } else
+ epc += 2;
+ } else {
+ if ((epc_insn & J32M) == J32) {
+ tmp = epc_insn & 0x03FFFFFE;
+ tmp2 = tmp & 0x7FFF;
+ tmp = (((tmp >> 16) & 0x3FF) << 15) | tmp2;
+ epc = (epc & 0xFFC00000) | tmp;
+ } else if ((epc_insn & B32M) == B32) {
+ child->thread.ss_nextcnt = 2;
+ tmp = epc_insn & 0x03FFFFFE; /* discard LK bit
*/
+ tmp2 = tmp & 0x3FF;
+ tmp = (((tmp >> 16) & 0x3FF) << 10) | tmp2; /*
20bit */
+ tmp = tmp << 12;
+ tmp = (unsigned int)((int) tmp >> 12);
+ far_epc = epc + tmp;
+ epc += 4;
+ } else if ((epc_insn & BR32M) == BR32) {
+ child->thread.ss_nextcnt = 2;
+ tmp = (epc_insn >> 16) & 0x1F;
+ far_epc = regs->regs[tmp];
+ epc += 4;
+ } else
+ epc += 4;
+ }
+
+ if (child->thread.ss_nextcnt == 1) {
+ read_tsk_long(child, epc, &epc_insn);
+
+ if (is_16bitinsn(epc_insn)) {
+ write_tsk_short(child, epc, SINGLESTEP16_INSN);
+ ninsn_type = 0;
+ } else {
+ write_tsk_long(child, epc, SINGLESTEP32_INSN);
+ ninsn_type = 1;
+ }
+
+ if (ninsn_type == 0) { /* 16bits */
+ child->thread.insn1_type = 0;
+ child->thread.addr1 = epc;
+ /* the insn may have 32bit data */
+ child->thread.insn1 = (short)epc_insn;
+ } else {
+ child->thread.insn1_type = 1;
+ child->thread.addr1 = epc;
+ child->thread.insn1 = epc_insn;
+ }
+ } else {
+ /* branch! have two target child->thread.ss_nextcnt=2 */
+ read_tsk_long(child, epc, &epc_insn);
+ read_tsk_long(child, far_epc, &far_epc_insn);
+ if (is_16bitinsn(epc_insn)) {
+ write_tsk_short(child, epc, SINGLESTEP16_INSN);
+ ninsn_type = 0;
+ } else {
+ write_tsk_long(child, epc, SINGLESTEP32_INSN);
+ ninsn_type = 1;
+ }
+
+ if (ninsn_type == 0) { /* 16bits */
+ child->thread.insn1_type = 0;
+ child->thread.addr1 = epc;
+ /* the insn may have 32bit data */
+ child->thread.insn1 = (short)epc_insn;
+ } else {
+ child->thread.insn1_type = 1;
+ child->thread.addr1 = epc;
+ child->thread.insn1 = epc_insn;
+ }
+
+ if (is_16bitinsn(far_epc_insn)) {
+ write_tsk_short(child, far_epc,
SINGLESTEP16_INSN);
+ ninsn_type = 0;
+ } else {
+ write_tsk_long(child, far_epc, SINGLESTEP32_INSN);
+ ninsn_type = 1;
+ }
+
+ if (ninsn_type == 0) { /* 16bits */
+ child->thread.insn2_type = 0;
+ child->thread.addr2 = far_epc;
+ /* the insn may have 32bit data */
+ child->thread.insn2 = (short)far_epc_insn;
+ } else {
+ child->thread.insn2_type = 1;
+ child->thread.addr2 = far_epc;
+ child->thread.insn2 = far_epc_insn;
+ }
+ }
+}
+
+void clear_single_step(struct task_struct *child)
+{
+ if (child->thread.insn1_type == 0)
+ write_tsk_short(child, child->thread.addr1,
+ child->thread.insn1);
+
+ if (child->thread.insn1_type == 1)
+ write_tsk_long(child, child->thread.addr1,
+ child->thread.insn1);
+
+ if (child->thread.ss_nextcnt == 2) { /* branch */
+ if (child->thread.insn1_type == 0)
+ write_tsk_short(child, child->thread.addr1,
+ child->thread.insn1);
+ if (child->thread.insn1_type == 1)
+ write_tsk_long(child, child->thread.addr1,
+ child->thread.insn1);
+ if (child->thread.insn2_type == 0)
+ write_tsk_short(child, child->thread.addr2,
+ child->thread.insn2);
+ if (child->thread.insn2_type == 1)
+ write_tsk_long(child, child->thread.addr2,
+ child->thread.insn2);
+ }
+
+ child->thread.single_step = 0;
+ child->thread.ss_nextcnt = 0;
+}
+
+
+void ptrace_disable(struct task_struct *child) {}
+
+long
+arch_ptrace(struct task_struct *child, long request, long addr, long
data)
+{
+ int ret;
+
+ if (request == PTRACE_TRACEME) {
+ /* are we already being traced? */
+ if (current->ptrace & PT_PTRACED)
+ return -EPERM;
+
+ /* set the ptrace bit in the process flags. */
+ current->ptrace |= PT_PTRACED;
+ return 0;
+ }
+
+ ret = -ESRCH;
+ if (!child)
+ return ret;
+
+ ret = -EPERM;
+
+ if (request == PTRACE_ATTACH) {
+ ret = ptrace_attach(child);
+ return ret;
+ }
+
+ ret = ptrace_check_attach(child, request == PTRACE_KILL);
+ if (ret < 0)
+ return ret;
+
+ switch (request) {
+ case PTRACE_PEEKTEXT: /* read word at location addr. */
+ case PTRACE_PEEKDATA: {
+ unsigned long tmp;
+ int copied;
+
+ copied = access_process_vm(child, addr, &tmp, sizeof(tmp),
0);
+ ret = -EIO;
+ if (copied != sizeof(tmp))
+ break;
+
+ ret = put_user(tmp, (unsigned long *) data);
+ return ret;
+ }
+
+ /* Read the word at location addr in the USER area. */
+ case PTRACE_PEEKUSR: {
+ struct pt_regs *regs;
+ unsigned long tmp;
+
+ regs = task_pt_regs(child);
+
+ tmp = 0; /* Default return value. */
+ switch (addr) {
+ case 0 ... 31:
+ tmp = regs->regs[addr];
+ break;
+ case PC:
+ tmp = regs->cp0_epc;
+ break;
+ case ECR:
+ tmp = regs->cp0_ecr;
+ break;
+ case EMA:
+ tmp = regs->cp0_ema;
+ break;
+ case CEH:
+ tmp = regs->ceh;
+ break;
+ case CEL:
+ tmp = regs->cel;
+ break;
+ case CONDITION:
+ tmp = regs->cp0_condition;
+ break;
+ case PSR:
+ tmp = regs->cp0_psr;
+ break;
+ case COUNTER:
+ tmp = regs->sr0;
+ break;
+ case LDCR:
+ tmp = regs->sr1;
+ break;
+ case STCR:
+ tmp = regs->sr2;
+ break;
+ default:
+ tmp = 0;
+ return -EIO;
+ }
+
+ ret = put_user(tmp, (unsigned long *) data);
+ return ret;
+ }
+
+ case PTRACE_POKETEXT: /* write the word at location addr. */
+ case PTRACE_POKEDATA:
+ ret = 0;
+ if (access_process_vm(child, addr, &data, sizeof(data), 1)
+ == sizeof(data))
+ break;
+ ret = -EIO;
+ return ret;
+
+ case PTRACE_POKEUSR: {
+ struct pt_regs *regs;
+ ret = 0;
+ regs = task_pt_regs(child);
+
+ switch (addr) {
+ case 0 ... 31:
+ regs->regs[addr] = data;
+ break;
+ case PC:
+ regs->cp0_epc = data;
+ break;
+ case CEH:
+ regs->ceh = data;
+ break;
+ case CEL:
+ regs->cel = data;
+ break;
+ case CONDITION:
+ regs->cp0_condition = data;
+ break;
+ case PSR:
+ case COUNTER:
+ case STCR:
+ case LDCR:
+ break; /* user can't write the reg */
+ default:
+ /* The rest are not allowed. */
+ ret = -EIO;
+ break;
+ }
+ break;
+ }
+
+ case PTRACE_SYSCALL: /* continue and stop at next
+ (return from) syscall. */
+ case PTRACE_CONT: { /* restart after signal. */
+ ret = -EIO;
+ if (!valid_signal(data))
+ break;
+ if (request == PTRACE_SYSCALL)
+ set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ else
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+
+ child->exit_code = data;
+ wake_up_process(child);
+ ret = 0;
+ break;
+ }
+
+ /*
+ * make the child exit. Best I can do is send it a sigkill.
+ * perhaps it should be put in the status that it wants to
+ * exit.
+ */
+ case PTRACE_KILL:
+ ret = 0;
+ if (child->state == EXIT_ZOMBIE) /* already dead.
*/
+ break;
+ child->exit_code = SIGKILL;
+ clear_single_step(child);
+ wake_up_process(child);
+ break;
+
+ case PTRACE_SINGLESTEP: { /* set the trap flag. */
+ ret = -EIO;
+ if ((unsigned long) data > _NSIG)
+ break;
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ set_single_step(child);
+ child->exit_code = data;
+ /* give it a chance to run. */
+ wake_up_process(child);
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_DETACH: /* detach a process that was attached. */
+ ret = ptrace_detach(child, data);
+ break;
+
+ case PTRACE_SETOPTIONS:
+ if (data & PTRACE_O_TRACESYSGOOD)
+ child->ptrace |= PT_TRACESYSGOOD;
+ else
+ child->ptrace &= ~PT_TRACESYSGOOD;
+ ret = 0;
+ break;
+
+ default:
+ ret = -EIO;
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * Notification of system call entry/exit
+ * - triggered by current->work.syscall_trace
+ */
+asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
+{
+ if (!(current->ptrace & PT_PTRACED))
+ return;
+
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return;
+
+ /* The 0x80 provides a way for the tracing parent to distinguish
+ between a syscall stop and SIGTRAP delivery. */
+ ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
+ 0x80 : 0));
+
+ /*
+ * this isn't the same as continuing with a signal, but it will do
+ * for normal use. strace only continues with a signal if the
+ * stopping signal is not SIGTRAP. -brl
+ */
+ if (current->exit_code) {
+ send_sig(current->exit_code, current, 1);
+ current->exit_code = 0;
+ }
+}
diff --git a/arch/score/kernel/setup.c b/arch/score/kernel/setup.c
new file mode 100644
index 0000000..94cba78
--- /dev/null
+++ b/arch/score/kernel/setup.c
@@ -0,0 +1,156 @@
+/*
+ * arch/score/kernel/setup.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@sunplusct.com>
+ * Lennox Wu <lennox.wu@sunplusct.com>
+ *
+ * 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/bootmem.h>
+#include <linux/initrd.h>
+#include <linux/ioport.h>
+#include <linux/seq_file.h>
+#include <linux/screen_info.h>
+#include <asm-generic/sections.h>
+
+struct screen_info screen_info;
+unsigned long kernelsp;
+
+static char command_line[COMMAND_LINE_SIZE];
+static struct resource code_resource = { .name = "Kernel code",};
+static struct resource data_resource = { .name = "Kernel data",};
+
+static void __init bootmem_init(void)
+{
+ unsigned long reserved_end, bootmap_size;
+ unsigned long size = initrd_end - initrd_start;
+
+ reserved_end = (unsigned long)_end;
+
+ min_low_pfn = 0;
+ max_low_pfn = MEM_SIZE / PAGE_SIZE;
+
+ /* Initialize the boot-time allocator with low memory only. */
+ bootmap_size = init_bootmem_node(NODE_DATA(0), reserved_end,
+ min_low_pfn, max_low_pfn);
+ add_active_range(0, min_low_pfn, max_low_pfn);
+
+ free_bootmem(PFN_PHYS(reserved_end),
+ (max_low_pfn - reserved_end) << PAGE_SHIFT);
+ memory_present(0, reserved_end, max_low_pfn);
+
+ /* Reserve space for the bootmem bitmap. */
+ reserve_bootmem(PFN_PHYS(reserved_end), bootmap_size,
BOOTMEM_DEFAULT);
+
+ if (size == 0) {
+ printk(KERN_INFO "Initrd not found or empty");
+ goto disable;
+ }
+
+ if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
+ printk(KERN_ERR "Initrd extends beyond end of memory");
+ goto disable;
+ }
+
+ /* Reserve space for the initrd bitmap. */
+ reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
+ initrd_below_start_ok = 1;
+
+ pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
+ initrd_start, size);
+ return;
+disable:
+ printk(KERN_CONT " - disabling initrd\n");
+ initrd_start = 0;
+ initrd_end = 0;
+}
+
+static void __init resource_init(void)
+{
+ struct resource *res;
+
+ code_resource.start = (unsigned long)_text;
+ code_resource.end = (unsigned long)_etext - 1;
+ data_resource.start = (unsigned long)_etext;
+ data_resource.end = (unsigned long)_edata - 1;
+
+ res = alloc_bootmem(sizeof(struct resource));
+ res->name = "System RAM";
+ res->start = 0;
+ res->end = MEM_SIZE - 1;
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ request_resource(&iomem_resource, res);
+
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+ randomize_va_space = 0;
+ *cmdline_p = command_line;
+
+ cpu_cache_init();
+ tlb_init();
+ bootmem_init();
+ paging_init();
+ resource_init();
+}
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+ unsigned long n = (unsigned long) v - 1;
+
+ seq_printf(m, "processor\t\t: %ld\n", n);
+ seq_printf(m, "\n");
+
+ return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ unsigned long i = *pos;
+
+ return i < 1 ? (void *) (i + 1) : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+const struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = show_cpuinfo,
+};
+
+static int __init topology_init(void)
+{
+ return 0;
+}
+
+subsys_initcall(topology_init);
--
1.6.2


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