Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6:
  agp: parisc-agp.c - use correct page_mask function
  parisc: Fix linker script breakage.
  parisc: convert to asm-generic/hardirq.h
  parisc: Make THREAD_SIZE available to assembly files and linker scripts.
  parisc: correct use of SHF_ALLOC
  parisc: rename parisc's vmalloc_start to parisc_vmalloc_start
  parisc: add me to Maintainers
  parisc: includecheck fix: signal.c
  parisc: HAVE_ARCH_TRACEHOOK
  parisc: add skeleton syscall.h
  parisc: stop using task->ptrace for {single,block}step flags
  parisc: split syscall_trace into two halves
  parisc: add missing TI_TASK macro in syscall.S
  parisc: tracehook_signal_handler
  parisc: tracehook_report_syscall

15 files changed, 126 insertions, 80 deletions

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index f388dc68f605..524d9352f17e 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -18,6 +18,7 @@ config PARISC
 	select BUG
 	select HAVE_PERF_EVENTS
 	select GENERIC_ATOMIC64 if !64BIT
+	select HAVE_ARCH_TRACEHOOK
 	help
 	  The PA-RISC microprocessor is designed by Hewlett-Packard and used
 	  in many of their workstations & servers (HP9000 700 and 800 series,
diff --git a/arch/parisc/include/asm/fixmap.h b/arch/parisc/include/asm/fixmap.h
index de3fe3a18229..6fec4d4a1a18 100644
--- a/arch/parisc/include/asm/fixmap.h
+++ b/arch/parisc/include/asm/fixmap.h
@@ -21,9 +21,9 @@
 #define KERNEL_MAP_END		(TMPALIAS_MAP_START)
 
 #ifndef __ASSEMBLY__
-extern void *vmalloc_start;
+extern void *parisc_vmalloc_start;
 #define PCXL_DMA_MAP_SIZE	(8*1024*1024)
-#define VMALLOC_START		((unsigned long)vmalloc_start)
+#define VMALLOC_START		((unsigned long)parisc_vmalloc_start)
 #define VMALLOC_END		(KERNEL_MAP_END)
 #endif /*__ASSEMBLY__*/
 
diff --git a/arch/parisc/include/asm/hardirq.h b/arch/parisc/include/asm/hardirq.h
index ce93133d5112..0d68184a76cb 100644
--- a/arch/parisc/include/asm/hardirq.h
+++ b/arch/parisc/include/asm/hardirq.h
@@ -1,29 +1,11 @@
 /* hardirq.h: PA-RISC hard IRQ support.
  *
  * Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>
- *
- * The locking is really quite interesting.  There's a cpu-local
- * count of how many interrupts are being handled, and a global
- * lock.  An interrupt can only be serviced if the global lock
- * is free.  You can't be sure no more interrupts are being
- * serviced until you've acquired the lock and then checked
- * all the per-cpu interrupt counts are all zero.  It's a specialised
- * br_lock, and that's exactly how Sparc does it.  We don't because
- * it's more locking for us.  This way is lock-free in the interrupt path.
  */
 
 #ifndef _PARISC_HARDIRQ_H
 #define _PARISC_HARDIRQ_H
 
-#include <linux/threads.h>
-#include <linux/irq.h>
-
-typedef struct {
-	unsigned long __softirq_pending; /* set_bit is used on this */
-} ____cacheline_aligned irq_cpustat_t;
-
-#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
-
-void ack_bad_irq(unsigned int irq);
+#include <asm-generic/hardirq.h>
 
 #endif /* _PARISC_HARDIRQ_H */
diff --git a/arch/parisc/include/asm/ptrace.h b/arch/parisc/include/asm/ptrace.h
index 302f68dc889c..aead40b16dd8 100644
--- a/arch/parisc/include/asm/ptrace.h
+++ b/arch/parisc/include/asm/ptrace.h
@@ -59,8 +59,11 @@ void user_enable_block_step(struct task_struct *task);
 #define user_mode(regs)			(((regs)->iaoq[0] & 3) ? 1 : 0)
 #define user_space(regs)		(((regs)->iasq[1] != 0) ? 1 : 0)
 #define instruction_pointer(regs)	((regs)->iaoq[0] & ~3)
+#define user_stack_pointer(regs)	((regs)->gr[30])
 unsigned long profile_pc(struct pt_regs *);
 extern void show_regs(struct pt_regs *);
-#endif
+
+
+#endif /* __KERNEL__ */
 
 #endif
diff --git a/arch/parisc/include/asm/syscall.h b/arch/parisc/include/asm/syscall.h
new file mode 100644
index 000000000000..8bdfd2c8c39f
--- /dev/null
+++ b/arch/parisc/include/asm/syscall.h
@@ -0,0 +1,40 @@
+/* syscall.h */
+
+#ifndef _ASM_PARISC_SYSCALL_H_
+#define _ASM_PARISC_SYSCALL_H_
+
+#include <linux/err.h>
+#include <asm/ptrace.h>
+
+static inline long syscall_get_nr(struct task_struct *tsk,
+				  struct pt_regs *regs)
+{
+	return regs->gr[20];
+}
+
+static inline void syscall_get_arguments(struct task_struct *tsk,
+					 struct pt_regs *regs, unsigned int i,
+					 unsigned int n, unsigned long *args)
+{
+	BUG_ON(i);
+
+	switch (n) {
+	case 6:
+		args[5] = regs->gr[21];
+	case 5:
+		args[4] = regs->gr[22];
+	case 4:
+		args[3] = regs->gr[23];
+	case 3:
+		args[2] = regs->gr[24];
+	case 2:
+		args[1] = regs->gr[25];
+	case 1:
+		args[0] = regs->gr[26];
+		break;
+	default:
+		BUG();
+	}
+}
+
+#endif /*_ASM_PARISC_SYSCALL_H_*/
diff --git a/arch/parisc/include/asm/thread_info.h b/arch/parisc/include/asm/thread_info.h
index ac775a76bff7..7ecc1039cfed 100644
--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -32,6 +32,11 @@ struct thread_info {
 #define init_thread_info        (init_thread_union.thread_info)
 #define init_stack              (init_thread_union.stack)
 
+/* how to get the thread information struct from C */
+#define current_thread_info()	((struct thread_info *)mfctl(30))
+
+#endif /* !__ASSEMBLY */
+
 /* thread information allocation */
 
 #define THREAD_SIZE_ORDER            2
@@ -40,11 +45,6 @@ struct thread_info {
 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
 #define THREAD_SHIFT            (PAGE_SHIFT + THREAD_SIZE_ORDER)
 
-/* how to get the thread information struct from C */
-#define current_thread_info()	((struct thread_info *)mfctl(30))
-
-#endif /* !__ASSEMBLY */
-
 #define PREEMPT_ACTIVE_BIT	28
 #define PREEMPT_ACTIVE		(1 << PREEMPT_ACTIVE_BIT)
 
@@ -60,6 +60,8 @@ struct thread_info {
 #define TIF_RESTORE_SIGMASK	6	/* restore saved signal mask */
 #define TIF_FREEZE		7	/* is freezing for suspend */
 #define TIF_NOTIFY_RESUME	8	/* callback before returning to user */
+#define TIF_SINGLESTEP		9	/* single stepping? */
+#define TIF_BLOCKSTEP		10	/* branch stepping? */
 
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
@@ -69,6 +71,8 @@ struct thread_info {
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_FREEZE		(1 << TIF_FREEZE)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
+#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
+#define _TIF_BLOCKSTEP		(1 << TIF_BLOCKSTEP)
 
 #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
                                  _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)
diff --git a/arch/parisc/kernel/asm-offsets.c b/arch/parisc/kernel/asm-offsets.c
index 699cf8ef2118..fcd3c707bf12 100644
--- a/arch/parisc/kernel/asm-offsets.c
+++ b/arch/parisc/kernel/asm-offsets.c
@@ -270,8 +270,8 @@ int main(void)
 	DEFINE(DTLB_OFF_COUNT, offsetof(struct pdc_cache_info, dt_off_count));
 	DEFINE(DTLB_LOOP, offsetof(struct pdc_cache_info, dt_loop));
 	BLANK();
-	DEFINE(PA_BLOCKSTEP_BIT, 31-PT_BLOCKSTEP_BIT);
-	DEFINE(PA_SINGLESTEP_BIT, 31-PT_SINGLESTEP_BIT);
+	DEFINE(TIF_BLOCKSTEP_PA_BIT, 31-TIF_BLOCKSTEP);
+	DEFINE(TIF_SINGLESTEP_PA_BIT, 31-TIF_SINGLESTEP);
 	BLANK();
 	DEFINE(ASM_PMD_SHIFT, PMD_SHIFT);
 	DEFINE(ASM_PGDIR_SHIFT, PGDIR_SHIFT);
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 8c4712b74dc1..3a44f7f704fa 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -2047,12 +2047,13 @@ syscall_do_signal:
 	b,n     syscall_check_sig
 
 syscall_restore:
-	/* Are we being ptraced? */
 	LDREG	TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
 
-	ldw	TASK_PTRACE(%r1), %r19
-	bb,<	%r19,31,syscall_restore_rfi
-	nop
+	/* Are we being ptraced? */
+	ldw	TASK_FLAGS(%r1),%r19
+	ldi	(_TIF_SINGLESTEP|_TIF_BLOCKSTEP),%r2
+	and,COND(=)	%r19,%r2,%r0
+	b,n	syscall_restore_rfi
 
 	ldo	TASK_PT_FR31(%r1),%r19		   /* reload fpregs */
 	rest_fp	%r19
@@ -2113,16 +2114,16 @@ syscall_restore_rfi:
 	ldi	0x0b,%r20			   /* Create new PSW */
 	depi	-1,13,1,%r20			   /* C, Q, D, and I bits */
 
-	/* The values of PA_SINGLESTEP_BIT and PA_BLOCKSTEP_BIT are
-	 * set in include/linux/ptrace.h and converted to PA bitmap
+	/* The values of SINGLESTEP_BIT and BLOCKSTEP_BIT are
+	 * set in thread_info.h and converted to PA bitmap
 	 * numbers in asm-offsets.c */
 
-	/* if ((%r19.PA_SINGLESTEP_BIT)) { %r20.27=1} */
-	extru,=	%r19,PA_SINGLESTEP_BIT,1,%r0
+	/* if ((%r19.SINGLESTEP_BIT)) { %r20.27=1} */
+	extru,=	%r19,TIF_SINGLESTEP_PA_BIT,1,%r0
 	depi	-1,27,1,%r20			   /* R bit */
 
-	/* if ((%r19.PA_BLOCKSTEP_BIT)) { %r20.7=1} */
-	extru,= %r19,PA_BLOCKSTEP_BIT,1,%r0
+	/* if ((%r19.BLOCKSTEP_BIT)) { %r20.7=1} */
+	extru,= %r19,TIF_BLOCKSTEP_PA_BIT,1,%r0
 	depi	-1,7,1,%r20			   /* T bit */
 
 	STREG	%r20,TASK_PT_PSW(%r1)
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index 330f536a9324..2e7610cb33d5 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -423,8 +423,3 @@ void __init init_IRQ(void)
         set_eiem(cpu_eiem);	/* EIEM : enable all external intr */
 
 }
-
-void ack_bad_irq(unsigned int irq)
-{
-	printk(KERN_WARNING "unexpected IRQ %d\n", irq);
-}
diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c
index 61ee0eec4e69..212074653df7 100644
--- a/arch/parisc/kernel/module.c
+++ b/arch/parisc/kernel/module.c
@@ -893,7 +893,7 @@ int module_finalize(const Elf_Ehdr *hdr,
 	 * ourselves */
 	for (i = 1; i < hdr->e_shnum; i++) {
 		if(sechdrs[i].sh_type == SHT_SYMTAB
-		   && (sechdrs[i].sh_type & SHF_ALLOC)) {
+		   && (sechdrs[i].sh_flags & SHF_ALLOC)) {
 			int strindex = sechdrs[i].sh_link;
 			/* FIXME: AWFUL HACK
 			 * The cast is to drop the const from
diff --git a/arch/parisc/kernel/ptrace.c b/arch/parisc/kernel/ptrace.c
index 927db3668b6f..c4f49e45129d 100644
--- a/arch/parisc/kernel/ptrace.c
+++ b/arch/parisc/kernel/ptrace.c
@@ -13,6 +13,7 @@
 #include <linux/smp.h>
 #include <linux/errno.h>
 #include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/user.h>
 #include <linux/personality.h>
 #include <linux/security.h>
@@ -35,7 +36,8 @@
  */
 void ptrace_disable(struct task_struct *task)
 {
-	task->ptrace &= ~(PT_SINGLESTEP|PT_BLOCKSTEP);
+	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
+	clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
 
 	/* make sure the trap bits are not set */
 	pa_psw(task)->r = 0;
@@ -55,8 +57,8 @@ void user_disable_single_step(struct task_struct *task)
 
 void user_enable_single_step(struct task_struct *task)
 {
-	task->ptrace &= ~PT_BLOCKSTEP;
-	task->ptrace |= PT_SINGLESTEP;
+	clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
+	set_tsk_thread_flag(task, TIF_SINGLESTEP);
 
 	if (pa_psw(task)->n) {
 		struct siginfo si;
@@ -98,8 +100,8 @@ void user_enable_single_step(struct task_struct *task)
 
 void user_enable_block_step(struct task_struct *task)
 {
-	task->ptrace &= ~PT_SINGLESTEP;
-	task->ptrace |= PT_BLOCKSTEP;
+	clear_tsk_thread_flag(task, TIF_SINGLESTEP);
+	set_tsk_thread_flag(task, TIF_BLOCKSTEP);
 
 	/* Enable taken branch trap. */
 	pa_psw(task)->r = 0;
@@ -263,22 +265,20 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 }
 #endif
 
+long do_syscall_trace_enter(struct pt_regs *regs)
+{
+	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+	    tracehook_report_syscall_entry(regs))
+		return -1L;
+
+	return regs->gr[20];
+}
 
-void syscall_trace(void)
+void do_syscall_trace_exit(struct pt_regs *regs)
 {
-	if (!test_thread_flag(TIF_SYSCALL_TRACE))
-		return;
-	if (!(current->ptrace & PT_PTRACED))
-		return;
-	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;
-	}
+	int stepping = test_thread_flag(TIF_SINGLESTEP) ||
+		test_thread_flag(TIF_BLOCKSTEP);
+
+	if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
+		tracehook_report_syscall_exit(regs, stepping);
 }
diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 8eb3c63c407a..e8467e4aa8d1 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -21,6 +21,7 @@
 #include <linux/errno.h>
 #include <linux/wait.h>
 #include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/unistd.h>
 #include <linux/stddef.h>
 #include <linux/compat.h>
@@ -34,7 +35,6 @@
 #include <asm/asm-offsets.h>
 
 #ifdef CONFIG_COMPAT
-#include <linux/compat.h>
 #include "signal32.h"
 #endif
 
@@ -468,6 +468,9 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 		sigaddset(&current->blocked,sig);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
+
+	tracehook_signal_handler(sig, info, ka, regs, 0);
+
 	return 1;
 }
 
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 59fc1a43ec3e..f5f96021caa0 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -288,18 +288,23 @@ tracesys:
 	STREG	%r18,PT_GR18(%r2)
 	/* Finished saving things for the debugger */
 
-	ldil	L%syscall_trace,%r1
+	copy	%r2,%r26
+	ldil	L%do_syscall_trace_enter,%r1
 	ldil	L%tracesys_next,%r2
-	be	R%syscall_trace(%sr7,%r1)
+	be	R%do_syscall_trace_enter(%sr7,%r1)
 	ldo	R%tracesys_next(%r2),%r2
 	
-tracesys_next:	
+tracesys_next:
+	/* do_syscall_trace_enter either returned the syscallno, or -1L,
+	 *  so we skip restoring the PT_GR20 below, since we pulled it from
+	 *  task->thread.regs.gr[20] above.
+	 */
+	copy	%ret0,%r20
 	ldil	L%sys_call_table,%r1
 	ldo     R%sys_call_table(%r1), %r19
 
 	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
 	LDREG	TI_TASK(%r1), %r1
-	LDREG   TASK_PT_GR20(%r1), %r20
 	LDREG   TASK_PT_GR26(%r1), %r26		/* Restore the users args */
 	LDREG   TASK_PT_GR25(%r1), %r25
 	LDREG   TASK_PT_GR24(%r1), %r24
@@ -336,7 +341,8 @@ tracesys_exit:
 #ifdef CONFIG_64BIT
 	ldo	-16(%r30),%r29			/* Reference param save area */
 #endif
-	bl	syscall_trace, %r2
+	ldo	TASK_REGS(%r1),%r26
+	bl	do_syscall_trace_exit,%r2
 	STREG   %r28,TASK_PT_GR28(%r1)          /* save return value now */
 	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
 	LDREG	TI_TASK(%r1), %r1
@@ -353,12 +359,12 @@ tracesys_exit:
 
 tracesys_sigexit:
 	ldo     -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1      /* get task ptr */
-	LDREG	0(%r1), %r1
+	LDREG	TI_TASK(%r1), %r1
 #ifdef CONFIG_64BIT
 	ldo	-16(%r30),%r29			/* Reference param save area */
 #endif
-	bl	syscall_trace, %r2
-	nop
+	bl	do_syscall_trace_exit,%r2
+	ldo	TASK_REGS(%r1),%r26
 
 	ldil	L%syscall_exit_rfi,%r1
 	be,n	R%syscall_exit_rfi(%sr7,%r1)
diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
index 775be2791bc2..fda4baa059b5 100644
--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -28,6 +28,7 @@
 #include <asm/cache.h>
 #include <asm/page.h>
 #include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
 	
 /* ld script to make hppa Linux kernel */
 #ifndef CONFIG_64BIT
@@ -134,6 +135,15 @@ SECTIONS
 	__init_begin = .;
 	INIT_TEXT_SECTION(16384)
 	INIT_DATA_SECTION(16)
+	/* we have to discard exit text and such at runtime, not link time */
+	.exit.text :
+	{
+		EXIT_TEXT
+	}
+	.exit.data :
+	{
+		EXIT_DATA
+	}
 
 	PERCPU(PAGE_SIZE)
 	. = ALIGN(PAGE_SIZE);
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index d5aca31fddbb..13b6e3e59b99 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -434,8 +434,8 @@ void mark_rodata_ro(void)
 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 				     & ~(VM_MAP_OFFSET-1)))
 
-void *vmalloc_start __read_mostly;
-EXPORT_SYMBOL(vmalloc_start);
+void *parisc_vmalloc_start __read_mostly;
+EXPORT_SYMBOL(parisc_vmalloc_start);
 
 #ifdef CONFIG_PA11
 unsigned long pcxl_dma_start __read_mostly;
@@ -496,13 +496,14 @@ void __init mem_init(void)
 #ifdef CONFIG_PA11
 	if (hppa_dma_ops == &pcxl_dma_ops) {
 		pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
-		vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
+		parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
+						+ PCXL_DMA_MAP_SIZE);
 	} else {
 		pcxl_dma_start = 0;
-		vmalloc_start = SET_MAP_OFFSET(MAP_START);
+		parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
 	}
 #else
-	vmalloc_start = SET_MAP_OFFSET(MAP_START);
+	parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
 #endif
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",