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Subject[PATCH] LTT for 2.5.37 5/9: PowerPC trace support

This patch adds PowerPC trace support.

Here are the file modifications:
arch/ppc/config.in | 2 +
arch/ppc/kernel/entry.S | 33 ++++++++++++++++++
arch/ppc/kernel/irq.c | 6 +++
arch/ppc/kernel/misc.S | 4 ++
arch/ppc/kernel/process.c | 15 ++++++++
arch/ppc/kernel/syscalls.c | 4 ++
arch/ppc/kernel/time.c | 6 +++
arch/ppc/kernel/traps.c | 82 +++++++++++++++++++++++++++++++++++++++++++++
arch/ppc/mm/fault.c | 17 ++++++++-
include/asm-ppc/trace.h | 30 ++++++++++++++++
10 files changed, 198 insertions, 1 deletion
diff -urpN linux-2.5.37/arch/ppc/config.in linux-2.5.37-ltt/arch/ppc/config.in
--- linux-2.5.37/arch/ppc/config.in Fri Sep 20 11:20:29 2002
+++ linux-2.5.37-ltt/arch/ppc/config.in Fri Sep 20 12:43:27 2002
@@ -580,6 +580,8 @@ source net/bluetooth/Config.in

source lib/Config.in

+source drivers/trace/Config.in
+
mainmenu_option next_comment
comment 'Kernel hacking'

diff -urpN linux-2.5.37/arch/ppc/kernel/entry.S linux-2.5.37-ltt/arch/ppc/kernel/entry.S
--- linux-2.5.37/arch/ppc/kernel/entry.S Fri Sep 20 11:20:35 2002
+++ linux-2.5.37-ltt/arch/ppc/kernel/entry.S Fri Sep 20 12:43:27 2002
@@ -103,6 +103,32 @@ stack_ovf:
RFI
#endif /* CONFIG_PPC_ISERIES */

+/* LTT stuff */
+#if (CONFIG_TRACE || CONFIG_TRACE_MODULE)
+#define TRACE_REAL_ASM_SYSCALL_ENTRY \
+ addi r3,r1,STACK_FRAME_OVERHEAD; /* Put pointer to registers into r3 */ \
+ mflr r29; /* Save LR */ \
+ bl trace_real_syscall_entry; /* Call real trace function */ \
+ mtlr r29; /* Restore LR */ \
+ lwz r0,GPR0(r1); /* Restore original registers */ \
+ lwz r3,GPR3(r1); \
+ lwz r4,GPR4(r1); \
+ lwz r5,GPR5(r1); \
+ lwz r6,GPR6(r1); \
+ lwz r7,GPR7(r1); \
+ lwz r8,GPR8(r1);
+#define TRACE_REAL_ASM_SYSCALL_EXIT \
+ bl trace_real_syscall_exit; /* Call real trace function */ \
+ lwz r0,GPR0(r1); /* Restore original registers */ \
+ lwz r3,RESULT(r1); \
+ lwz r4,GPR4(r1); \
+ lwz r5,GPR5(r1); \
+ lwz r6,GPR6(r1); \
+ lwz r7,GPR7(r1); \
+ lwz r8,GPR8(r1); \
+ addi r9,r1,STACK_FRAME_OVERHEAD;
+#endif
+
/*
* Handle a system call.
*/
@@ -133,12 +159,19 @@ syscall_dotrace_cont:
slwi r0,r0,2
lwzx r10,r10,r0 /* Fetch system call handler [ptr] */
mtlr r10
+#if (CONFIG_TRACE || CONFIG_TRACE_MODULE)
+ TRACE_REAL_ASM_SYSCALL_ENTRY ;
+#endif
addi r9,r1,STACK_FRAME_OVERHEAD
blrl /* Call handler */
.globl ret_from_syscall
ret_from_syscall:
#ifdef SHOW_SYSCALLS
bl do_show_syscall_exit
+#endif
+#if (CONFIG_TRACE || CONFIG_TRACE_MODULE)
+ stw r3,RESULT(r1) /* Save result */
+ TRACE_REAL_ASM_SYSCALL_EXIT ;
#endif
mr r6,r3
li r11,-_LAST_ERRNO
diff -urpN linux-2.5.37/arch/ppc/kernel/irq.c linux-2.5.37-ltt/arch/ppc/kernel/irq.c
--- linux-2.5.37/arch/ppc/kernel/irq.c Fri Sep 20 11:20:21 2002
+++ linux-2.5.37-ltt/arch/ppc/kernel/irq.c Fri Sep 20 12:43:27 2002
@@ -45,6 +45,8 @@
#include <linux/random.h>
#include <linux/seq_file.h>

+#include <linux/trace.h>
+
#include <asm/uaccess.h>
#include <asm/bitops.h>
#include <asm/system.h>
@@ -423,6 +425,8 @@ void ppc_irq_dispatch_handler(struct pt_
int cpu = smp_processor_id();
irq_desc_t *desc = irq_desc + irq;

+ TRACE_IRQ_ENTRY(irq, !(user_mode(regs)));
+
kstat.irqs[cpu][irq]++;
spin_lock(&desc->lock);
ack_irq(irq);
@@ -500,6 +504,8 @@ out:
irq_desc[irq].handler->enable(irq);
}
spin_unlock(&desc->lock);
+
+ TRACE_IRQ_EXIT();
}

#ifndef CONFIG_PPC_ISERIES /* iSeries version is in iSeries_pic.c */
diff -urpN linux-2.5.37/arch/ppc/kernel/misc.S linux-2.5.37-ltt/arch/ppc/kernel/misc.S
--- linux-2.5.37/arch/ppc/kernel/misc.S Fri Sep 20 11:20:23 2002
+++ linux-2.5.37-ltt/arch/ppc/kernel/misc.S Fri Sep 20 12:43:27 2002
@@ -1013,7 +1013,11 @@ _GLOBAL(cvt_df)
* Create a kernel thread
* kernel_thread(fn, arg, flags)
*/
+#if (CONFIG_TRACE || CONFIG_TRACE_MODULE)
+_GLOBAL(original_kernel_thread)
+#else
_GLOBAL(kernel_thread)
+#endif /* (CONFIG_TRACE || CONFIG_TRACE_MODULE) */
stwu r1,-16(r1)
stw r30,8(r1)
stw r31,12(r1)
diff -urpN linux-2.5.37/arch/ppc/kernel/process.c linux-2.5.37-ltt/arch/ppc/kernel/process.c
--- linux-2.5.37/arch/ppc/kernel/process.c Fri Sep 20 11:20:26 2002
+++ linux-2.5.37-ltt/arch/ppc/kernel/process.c Fri Sep 20 12:43:27 2002
@@ -34,6 +34,8 @@
#include <linux/prctl.h>
#include <linux/init_task.h>

+#include <linux/trace.h>
+
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -293,6 +295,19 @@ void show_regs(struct pt_regs * regs)
printk("\n");
show_stack((unsigned long *)regs->gpr[1]);
}
+
+#if (CONFIG_TRACE || CONFIG_TRACE_MODULE)
+long original_kernel_thread(int (*fn) (void *), void* arg, unsigned long flags);
+long kernel_thread(int (*fn) (void *), void* arg, unsigned long flags)
+{
+ long retval;
+
+ retval = original_kernel_thread(fn, arg, flags);
+ if (retval > 0)
+ TRACE_PROCESS(TRACE_EV_PROCESS_KTHREAD, retval, (int) fn);
+ return retval;
+}
+#endif /* (CONFIG_TRACE || CONFIG_TRACE_MODULE) */

void exit_thread(void)
{
diff -urpN linux-2.5.37/arch/ppc/kernel/syscalls.c linux-2.5.37-ltt/arch/ppc/kernel/syscalls.c
--- linux-2.5.37/arch/ppc/kernel/syscalls.c Fri Sep 20 11:20:36 2002
+++ linux-2.5.37-ltt/arch/ppc/kernel/syscalls.c Fri Sep 20 12:43:27 2002
@@ -36,6 +36,8 @@
#include <linux/utsname.h>
#include <linux/file.h>

+#include <linux/trace.h>
+
#include <asm/uaccess.h>
#include <asm/ipc.h>
#include <asm/semaphore.h>
@@ -81,6 +83,8 @@ sys_ipc (uint call, int first, int secon

version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
+
+ TRACE_IPC(TRACE_EV_IPC_CALL, call, first);

ret = -EINVAL;
switch (call) {
diff -urpN linux-2.5.37/arch/ppc/kernel/time.c linux-2.5.37-ltt/arch/ppc/kernel/time.c
--- linux-2.5.37/arch/ppc/kernel/time.c Fri Sep 20 11:20:20 2002
+++ linux-2.5.37-ltt/arch/ppc/kernel/time.c Fri Sep 20 12:43:27 2002
@@ -57,6 +57,8 @@
#include <linux/time.h>
#include <linux/init.h>

+#include <linux/trace.h>
+
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/processor.h>
@@ -158,6 +160,8 @@ void timer_interrupt(struct pt_regs * re
if (atomic_read(&ppc_n_lost_interrupts) != 0)
do_IRQ(regs);

+ TRACE_TRAP_ENTRY(regs->trap, instruction_pointer(regs));
+
irq_enter();

while ((next_dec = tb_ticks_per_jiffy - tb_delta(&jiffy_stamp)) < 0) {
@@ -212,6 +216,8 @@ void timer_interrupt(struct pt_regs * re
ppc_md.heartbeat();

irq_exit();
+
+ TRACE_TRAP_EXIT();
}
#endif /* CONFIG_PPC_ISERIES */

diff -urpN linux-2.5.37/arch/ppc/kernel/traps.c linux-2.5.37-ltt/arch/ppc/kernel/traps.c
--- linux-2.5.37/arch/ppc/kernel/traps.c Fri Sep 20 11:20:19 2002
+++ linux-2.5.37-ltt/arch/ppc/kernel/traps.c Fri Sep 20 12:43:27 2002
@@ -30,6 +30,8 @@
#include <linux/config.h>
#include <linux/init.h>

+#include <linux/trace.h>
+
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@@ -108,7 +110,9 @@ _exception(int signr, struct pt_regs *re
debugger(regs);
die("Exception in kernel mode", regs, signr);
}
+ TRACE_TRAP_ENTRY(regs->trap, instruction_pointer(regs));
force_sig(signr, current);
+ TRACE_TRAP_EXIT();
}

void
@@ -366,6 +370,84 @@ StackOverflow(struct pt_regs *regs)
show_regs(regs);
panic("kernel stack overflow");
}
+
+/* Trace related code */
+#if (CONFIG_TRACE || CONFIG_TRACE_MODULE)
+asmlinkage void trace_real_syscall_entry(struct pt_regs *regs)
+{
+ int use_depth;
+ int use_bounds;
+ int depth = 0;
+ int seek_depth;
+ unsigned long lower_bound;
+ unsigned long upper_bound;
+ unsigned long addr;
+ unsigned long *stack;
+ trace_syscall_entry trace_syscall_event;
+
+ /* Set the syscall ID */
+ trace_syscall_event.syscall_id = (uint8_t) regs->gpr[0];
+
+ /* Set the address in any case */
+ trace_syscall_event.address = instruction_pointer(regs);
+
+ /* Are we in the kernel (This is a kernel thread)? */
+ if (!user_mode(regs))
+ /* Don't go digining anywhere */
+ goto trace_syscall_end;
+
+ /* Get the trace configuration */
+ if (trace_get_config(&use_depth,
+ &use_bounds,
+ &seek_depth,
+ (void *) &lower_bound,
+ (void *) &upper_bound) < 0)
+ goto trace_syscall_end;
+
+ /* Do we have to search for an eip address range */
+ if ((use_depth == 1) || (use_bounds == 1)) {
+ /* Start at the top of the stack (bottom address since stacks grow downward) */
+ stack = (unsigned long *) regs->gpr[1];
+
+ /* Skip over first stack frame as the return address isn't valid */
+ if (get_user(addr, stack))
+ goto trace_syscall_end;
+ stack = (unsigned long *) addr;
+
+ /* Keep on going until we reach the end of the process' stack limit (wherever it may be) */
+ while (!get_user(addr, stack + 1)) { /* "stack + 1", since this is where the IP is */
+ /* Does this LOOK LIKE an address in the program */
+ if ((addr > current->mm->start_code)
+ && (addr < current->mm->end_code)) {
+ /* Does this address fit the description */
+ if (((use_depth == 1) && (depth == seek_depth))
+ || ((use_bounds == 1) && (addr > lower_bound) && (addr < upper_bound))) {
+ /* Set the address */
+ trace_syscall_event.address = addr;
+
+ /* We're done */
+ goto trace_syscall_end;
+ } else
+ /* We're one depth more */
+ depth++;
+ }
+ /* Go on to the next address */
+ if (get_user(addr, stack))
+ goto trace_syscall_end;
+ stack = (unsigned long *) addr;
+ }
+ }
+trace_syscall_end:
+ /* Trace the event */
+ trace_event(TRACE_EV_SYSCALL_ENTRY, &trace_syscall_event);
+}
+
+asmlinkage void trace_real_syscall_exit(void)
+{
+ trace_event(TRACE_EV_SYSCALL_EXIT, NULL);
+}
+
+#endif /* (CONFIG_TRACE || CONFIG_TRACE_MODULE) */

void nonrecoverable_exception(struct pt_regs *regs)
{
diff -urpN linux-2.5.37/arch/ppc/mm/fault.c linux-2.5.37-ltt/arch/ppc/mm/fault.c
--- linux-2.5.37/arch/ppc/mm/fault.c Fri Sep 20 11:20:21 2002
+++ linux-2.5.37-ltt/arch/ppc/mm/fault.c Fri Sep 20 12:43:27 2002
@@ -28,6 +28,8 @@
#include <linux/interrupt.h>
#include <linux/highmem.h>

+#include <linux/trace.h>
+
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
@@ -85,22 +87,29 @@ void do_page_fault(struct pt_regs *regs,
is_write = error_code & 0x02000000;
#endif /* CONFIG_4xx */

+ TRACE_TRAP_ENTRY(regs->trap, instruction_pointer(regs));
+
+
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
if (debugger_fault_handler && TRAP(regs) == 0x300) {
debugger_fault_handler(regs);
+ TRACE_TRAP_EXIT();
return;
}
#if !defined(CONFIG_4xx)
if (error_code & 0x00400000) {
/* DABR match */
- if (debugger_dabr_match(regs))
+ if (debugger_dabr_match(regs)){
+ TRACE_TRAP_EXIT();
return;
+ }
}
#endif /* !CONFIG_4xx */
#endif /* CONFIG_XMON || CONFIG_KGDB */

if (in_atomic() || mm == NULL) {
bad_page_fault(regs, address, SIGSEGV);
+ TRACE_TRAP_EXIT();
return;
}
down_read(&mm->mmap_sem);
@@ -165,6 +174,7 @@ good_area:
_tlbie(address);
pte_unmap(ptep);
up_read(&mm->mmap_sem);
+ TRACE_TRAP_EXIT();
return;
}
if (ptep != NULL)
@@ -207,6 +217,7 @@ good_area:
* -- Cort
*/
pte_misses++;
+ TRACE_TRAP_EXIT();
return;

bad_area:
@@ -220,10 +231,12 @@ bad_area:
info.si_code = code;
info.si_addr = (void *) address;
force_sig_info(SIGSEGV, &info, current);
+ TRACE_TRAP_EXIT();
return;
}

bad_page_fault(regs, address, SIGSEGV);
+ TRACE_TRAP_EXIT();
return;

/*
@@ -241,6 +254,7 @@ out_of_memory:
if (user_mode(regs))
do_exit(SIGKILL);
bad_page_fault(regs, address, SIGKILL);
+ TRACE_TRAP_EXIT();
return;

do_sigbus:
@@ -252,6 +266,7 @@ do_sigbus:
force_sig_info (SIGBUS, &info, current);
if (!user_mode(regs))
bad_page_fault(regs, address, SIGBUS);
+ TRACE_TRAP_EXIT();
}

/*
diff -urpN linux-2.5.37/include/asm-ppc/trace.h linux-2.5.37-ltt/include/asm-ppc/trace.h
--- linux-2.5.37/include/asm-ppc/trace.h Wed Dec 31 19:00:00 1969
+++ linux-2.5.37-ltt/include/asm-ppc/trace.h Fri Sep 20 12:43:27 2002
@@ -0,0 +1,30 @@
+/*
+ * linux/include/asm-ppc/trace.h
+ *
+ * Copyright (C) 2002, Karim Yaghmour
+ *
+ * PowerPC definitions for tracing system
+ */
+
+#include <linux/config.h>
+#include <linux/trace.h>
+
+/* Current arch type */
+#define TRACE_ARCH_TYPE TRACE_ARCH_TYPE_PPC
+
+/* PowerPC variants */
+#define TRACE_ARCH_VARIANT_PPC_4xx 1 /* 4xx systems (IBM embedded series) */
+#define TRACE_ARCH_VARIANT_PPC_6xx 2 /* 6xx/7xx/74xx/8260/POWER3 systems (desktop flavor) */
+#define TRACE_ARCH_VARIANT_PPC_8xx 3 /* 8xx system (Motoral embedded series) */
+#define TRACE_ARCH_VARIANT_PPC_ISERIES 4 /* 8xx system (iSeries) */
+
+/* Current variant type */
+#if defined(CONFIG_4xx)
+#define TRACE_ARCH_VARIANT TRACE_ARCH_VARIANT_PPC_4xx
+#elif defined(CONFIG_6xx)
+#define TRACE_ARCH_VARIANT TRACE_ARCH_VARIANT_PPC_6xx
+#elif defined(CONFIG_8xx)
+#define TRACE_ARCH_VARIANT TRACE_ARCH_VARIANT_PPC_8xx
+#elif defined(CONFIG_PPC_ISERIES)
+#define TRACE_ARCH_VARIANT TRACE_ARCH_VARIANT_PPC_ISERIES
+#endif
-
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