Merge commit 'v2.6.32-rc3'

1 files changed, 382 insertions, 0 deletions

diff --git a/arch/score/kernel/ptrace.c b/arch/score/kernel/ptrace.c
new file mode 100644
index 0000000..174c642
--- /dev/null
+++ b/arch/score/kernel/ptrace.c
@@ -0,0 +1,382 @@
+/*
+ * 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/elf.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/ptrace.h>
+#include <linux/regset.h>
+
+#include <asm/uaccess.h>
+
+/*
+ * retrieve the contents of SCORE userspace general registers
+ */
+static int genregs_get(struct task_struct *target,
+		       const struct user_regset *regset,
+		       unsigned int pos, unsigned int count,
+		       void *kbuf, void __user *ubuf)
+{
+	const struct pt_regs *regs = task_pt_regs(target);
+	int ret;
+
+	/* skip 9 * sizeof(unsigned long) not use for pt_regs */
+	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+					0, offsetof(struct pt_regs, regs));
+
+	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
+	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				  regs->regs,
+				  offsetof(struct pt_regs, regs),
+				  offsetof(struct pt_regs, cp0_condition));
+
+	if (!ret)
+		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+						sizeof(struct pt_regs), -1);
+
+	return ret;
+}
+
+/*
+ * update the contents of the SCORE userspace general registers
+ */
+static int genregs_set(struct task_struct *target,
+		       const struct user_regset *regset,
+		       unsigned int pos, unsigned int count,
+		       const void *kbuf, const void __user *ubuf)
+{
+	struct pt_regs *regs = task_pt_regs(target);
+	int ret;
+
+	/* skip 9 * sizeof(unsigned long) */
+	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+					0, offsetof(struct pt_regs, regs));
+
+	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				  regs->regs,
+				  offsetof(struct pt_regs, regs),
+				  offsetof(struct pt_regs, cp0_condition));
+
+	if (!ret)
+		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+						sizeof(struct pt_regs), -1);
+
+	return ret;
+}
+
+/*
+ * Define the register sets available on the score7 under Linux
+ */
+enum score7_regset {
+	REGSET_GENERAL,
+};
+
+static const struct user_regset score7_regsets[] = {
+	[REGSET_GENERAL] = {
+		.core_note_type	= NT_PRSTATUS,
+		.n		= ELF_NGREG,
+		.size		= sizeof(long),
+		.align		= sizeof(long),
+		.get		= genregs_get,
+		.set		= genregs_set,
+	},
+};
+
+static const struct user_regset_view user_score_native_view = {
+	.name		= "score7",
+	.e_machine	= EM_SCORE7,
+	.regsets	= score7_regsets,
+	.n		= ARRAY_SIZE(score7_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+	return &user_score_native_view;
+}
+
+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 user_enable_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 user_disable_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)
+{
+	user_disable_single_step(child);
+}
+
+long
+arch_ptrace(struct task_struct *child, long request, long addr, long data)
+{
+	int ret;
+	unsigned long __user *datap = (void __user *)data;
+
+	switch (request) {
+	case PTRACE_GETREGS:
+		ret = copy_regset_to_user(child, &user_score_native_view,
+						REGSET_GENERAL,
+						0, sizeof(struct pt_regs),
+						(void __user *)datap);
+		break;
+
+	case PTRACE_SETREGS:
+		ret = copy_regset_from_user(child, &user_score_native_view,
+						REGSET_GENERAL,
+						0, sizeof(struct pt_regs),
+						(const void __user *)datap);
+		break;
+
+	default:
+		ret = ptrace_request(child, request, addr, data);
+		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;
+	}
+}