[PATCH] LTT for 2.5.45 7/10: S/390 trace support

Karim Yaghmour (karim@opersys.com)
Wed, 30 Oct 2002 22:31:21 -0500

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D: This patch adds the bare-minimum S/390-specific low-level trace
D: statements.

diff -urpN linux-2.5.45/arch/s390/kernel/entry.S linux-2.5.45-ltt/arch/s390/kernel/entry.S
--- linux-2.5.45/arch/s390/kernel/entry.S Wed Oct 30 19:42:16 2002
+++ linux-2.5.45-ltt/arch/s390/kernel/entry.S Wed Oct 30 20:51:10 2002
@@ -7,6 +7,7 @@
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Hartmut Penner (hp@de.ibm.com),
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
+ * Portions added by T. Halloran: (C) Copyright 2002 IBM Poughkeepsie, IBM Corporation
*/

#include <linux/sys.h>
@@ -181,6 +182,14 @@ system_call:
GET_THREAD_INFO # load pointer to task_struct to R9
sll %r7,2
stosm 24(%r15),0x03 # reenable interrupts
+/* call to ltt trace done here. R8 has the syscall (svc) number to trace */
+#if (CONFIG_TRACE) /* tjh - ltt port */
+ /* add call to trace_real_syscall_entry */
+ la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter
+ l %r1,BASED(.Ltracesysent)
+ basr %r14,%r1
+ lm %r0,%r6,SP_R0(%r15) /* restore call clobbered regs tjh */
+#endif
l %r8,sys_call_table-entry_base(%r7,%r13) # get system call addr.
tm __TI_flags+3(%r9),_TIF_SYSCALL_TRACE
bo BASED(sysc_tracesys)
@@ -189,6 +198,13 @@ system_call:
# ATTENTION: check sys_execve_glue before
# changing anything here !!

+#if (CONFIG_TRACE) /* tjh - ltt port */
+ /* add call to trace_real_syscall_exit */
+ la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter
+ l %r1,BASED(.Ltracesysext)
+ basr %r14,%r1
+ lm %r0,%r6,SP_R0(%r15) /* restore call clobbered regs */
+#endif
sysc_return:
stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
tm __TI_flags+3(%r9),_TIF_WORK_MASK
@@ -928,6 +944,8 @@ restart_go:
.Lsigaltstack: .long sys_sigaltstack
.Ltrace: .long syscall_trace
.Lvfork: .long sys_vfork
+.Ltracesysent: .long trace_real_syscall_entry
+.Ltracesysext: .long trace_real_syscall_exit
#if CONFIG_SMP || CONFIG_PREEMPT
.Lschedtail: .long schedule_tail
#endif
diff -urpN linux-2.5.45/arch/s390/kernel/process.c linux-2.5.45-ltt/arch/s390/kernel/process.c
--- linux-2.5.45/arch/s390/kernel/process.c Wed Oct 30 19:43:36 2002
+++ linux-2.5.45-ltt/arch/s390/kernel/process.c Wed Oct 30 20:51:10 2002
@@ -33,6 +33,7 @@
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/init.h>
+#include <linux/trace.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>
@@ -147,6 +148,10 @@ int kernel_thread(int (*fn)(void *), voi

/* Ok, create the new process.. */
p = do_fork(flags | CLONE_VM, 0, &regs, 0, NULL);
+#if (CONFIG_TRACE)
+ if(!IS_ERR(p))
+ TRACE_PROCESS(TRACE_EV_PROCESS_KTHREAD, p->pid, (int) fn);
+#endif
return IS_ERR(p) ? PTR_ERR(p) : p->pid;
}

diff -urpN linux-2.5.45/arch/s390/kernel/sys_s390.c linux-2.5.45-ltt/arch/s390/kernel/sys_s390.c
--- linux-2.5.45/arch/s390/kernel/sys_s390.c Wed Oct 30 19:42:27 2002
+++ linux-2.5.45-ltt/arch/s390/kernel/sys_s390.c Wed Oct 30 20:51:10 2002
@@ -24,6 +24,7 @@
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
+#include <linux/trace.h>

#include <asm/uaccess.h>
#include <asm/ipc.h>
@@ -145,6 +146,8 @@ asmlinkage int sys_ipc (uint call, int f
struct ipc_kludge tmp;
int ret;

+ TRACE_IPC(TRACE_EV_IPC_CALL, call, first);
+
switch (call) {
case SEMOP:
return sys_semop (first, (struct sembuf *)ptr, second);
diff -urpN linux-2.5.45/arch/s390/kernel/traps.c linux-2.5.45-ltt/arch/s390/kernel/traps.c
--- linux-2.5.45/arch/s390/kernel/traps.c Wed Oct 30 19:42:26 2002
+++ linux-2.5.45-ltt/arch/s390/kernel/traps.c Wed Oct 30 20:51:10 2002
@@ -5,6 +5,7 @@
* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
+ * Portions added by T. Halloran: (C) Copyright 2002 IBM Poughkeepsie, IBM Corporation
*
* Derived from "arch/i386/kernel/traps.c"
* Copyright (C) 1991, 1992 Linus Torvalds
@@ -28,6 +29,8 @@
#include <linux/delay.h>
#include <linux/module.h>

+#include <linux/trace.h>
+
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -283,6 +286,9 @@ void die(const char * str, struct pt_reg
static void inline do_trap(long interruption_code, int signr, char *str,
struct pt_regs *regs, siginfo_t *info)
{
+ trapid_t ltt_interruption_code;
+ char * ic_ptr = (char *) &ltt_interruption_code;
+
/*
* We got all needed information from the lowcore and can
* now safely switch on interrupts.
@@ -290,6 +296,10 @@ static void inline do_trap(long interrup
if (regs->psw.mask & PSW_MASK_PSTATE)
local_irq_enable();

+ memset(&ltt_interruption_code,0,sizeof(ltt_interruption_code));
+ memcpy(ic_ptr+4,&interruption_code,sizeof(interruption_code));
+ TRACE_TRAP_ENTRY(ltt_interruption_code, (regs->psw.addr & PSW_ADDR_MASK));
+
if (regs->psw.mask & PSW_MASK_PSTATE) {
struct task_struct *tsk = current;

@@ -318,6 +328,7 @@ static void inline do_trap(long interrup
else
die(str, regs, interruption_code);
}
+ TRACE_TRAP_EXIT();
}

static inline void *get_check_address(struct pt_regs *regs)
@@ -415,6 +426,8 @@ asmlinkage void illegal_op(struct pt_reg
{
__u8 opcode[6];
__u16 *location;
+ trapid_t ltt_interruption_code;
+ char * ic_ptr = (char *) &ltt_interruption_code;
int signal = 0;

location = (__u16 *)(regs->psw.addr-S390_lowcore.pgm_ilc);
@@ -426,6 +439,10 @@ asmlinkage void illegal_op(struct pt_reg
if (regs->psw.mask & PSW_MASK_PSTATE)
local_irq_enable();

+ memset(&ltt_interruption_code,0,sizeof(ltt_interruption_code));
+ memcpy(ic_ptr+4,&interruption_code,sizeof(interruption_code));
+ TRACE_TRAP_ENTRY(ltt_interruption_code, (regs->psw.addr & PSW_ADDR_MASK));
+
if (regs->psw.mask & PSW_MASK_PSTATE)
get_user(*((__u16 *) opcode), location);
else
@@ -466,6 +483,7 @@ asmlinkage void illegal_op(struct pt_reg
else if (signal)
do_trap(interruption_code, signal,
"illegal operation", regs, NULL);
+ TRACE_TRAP_EXIT();
}

@@ -476,6 +494,8 @@ specification_exception(struct pt_regs *
{
__u8 opcode[6];
__u16 *location = NULL;
+ trapid_t ltt_interruption_code;
+ char * ic_ptr = (char *) &ltt_interruption_code;
int signal = 0;

location = (__u16 *) get_check_address(regs);
@@ -486,6 +506,10 @@ specification_exception(struct pt_regs *
*/
if (regs->psw.mask & PSW_MASK_PSTATE)
local_irq_enable();
+
+ memset(&ltt_interruption_code,0,sizeof(ltt_interruption_code));
+ memcpy(ic_ptr+4,&interruption_code,sizeof(interruption_code));
+ TRACE_TRAP_ENTRY(ltt_interruption_code, (regs->psw.addr & PSW_ADDR_MASK));

if (regs->psw.mask & PSW_MASK_PSTATE) {
get_user(*((__u16 *) opcode), location);
@@ -530,6 +554,7 @@ specification_exception(struct pt_regs *
do_trap(interruption_code, signal,
"specification exception", regs, &info);
}
+ TRACE_TRAP_EXIT();
}
#else
DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
@@ -539,6 +564,8 @@ DO_ERROR_INFO(SIGILL, "specification exc
asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
{
__u16 *location;
+ trapid_t ltt_interruption_code;
+ char * ic_ptr = (char *) &ltt_interruption_code;
int signal = 0;

location = (__u16 *) get_check_address(regs);
@@ -550,6 +577,10 @@ asmlinkage void data_exception(struct pt
if (regs->psw.mask & PSW_MASK_PSTATE)
local_irq_enable();

+ memset(&ltt_interruption_code,0,sizeof(ltt_interruption_code));
+ memcpy(ic_ptr+4,&interruption_code,sizeof(interruption_code));
+ TRACE_TRAP_ENTRY(ltt_interruption_code, (regs->psw.addr & PSW_ADDR_MASK));
+
if (MACHINE_HAS_IEEE)
__asm__ volatile ("stfpc %0\n\t"
: "=m" (current->thread.fp_regs.fpc));
@@ -625,6 +656,7 @@ asmlinkage void data_exception(struct pt
do_trap(interruption_code, signal,
"data exception", regs, &info);
}
+ TRACE_TRAP_EXIT();
}

@@ -679,6 +711,11 @@ void __init trap_init(void)

void handle_per_exception(struct pt_regs *regs)
{
+ trapid_t ltt_interruption_code;
+ char * ic_ptr = (char *) &ltt_interruption_code;
+ memset(&ltt_interruption_code,0,sizeof(ltt_interruption_code));
+ memcpy(ic_ptr+6,&S390_lowcore.pgm_code,2); /* copy the interrupt code */
+ TRACE_TRAP_ENTRY(ltt_interruption_code,(regs->psw.addr & PSW_ADDR_MASK));
if (regs->psw.mask & PSW_MASK_PSTATE) {
per_struct *per_info=&current->thread.per_info;
per_info->lowcore.words.perc_atmid=S390_lowcore.per_perc_atmid;
@@ -693,5 +730,85 @@ void handle_per_exception(struct pt_regs
/* Hopefully switching off per tracing will help us survive */
regs->psw.mask &= ~PSW_MASK_PER;
}
+ TRACE_TRAP_EXIT();
+}
+
+#if (CONFIG_TRACE)
+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;
+ unsigned long temp_stack;
+ trace_syscall_entry trace_syscall_event;
+ /* Set the syscall ID */
+ /* Register 8 is setup just prior to the call */
+ /* This instruction is just following linkage */
+ /* so it's ok. If moved and chance of R8 being */
+ /* clobbered, would need to dig it out of the stack */
+ __asm__ volatile (" stc 8,%0\n\t"
+ :"=m" (trace_syscall_event.syscall_id));
+ /* get the psw address */
+ trace_syscall_event.address = regs->psw.addr;
+ /* and off the hi-order bit */
+ trace_syscall_event.address &= PSW_ADDR_MASK;
+ if (!(user_mode(regs))) /* if kernel mode, return */
+ goto trace_syscall_end;
+ /* Get the trace configuration - if none, return */
+ 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 instruction pointer address range */
+ if ((use_depth == 1) || (use_bounds == 1)) {
+ /* Start at the top of the stack */
+ /* stack pointer is register 15 */
+ stack = (unsigned long *) regs->gprs[15]; /* stack pointer */
+ /* Keep on going until we reach the end of the process' stack limit */
+ do {
+ get_user(addr, stack + 14); /* get the program address +0x38 */
+ /* and off the hi-order bit */
+ addr &= PSW_ADDR_MASK;
+ /* 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 */
+ get_user(temp_stack, stack); /* get contents of stack */
+ temp_stack &= PSW_ADDR_MASK; /* and off hi order bit */
+ stack = (unsigned long *) temp_stack; /* move into stack */
+ /* stack may or may not go to zero when end hit */
+ /* using 0x7fffffff-_STK_LIM to validate that the address is */
+ /* within the range of a valid stack address */
+ /* If outside that range, exit the loop, stack end must have */
+ /* been hit. */
+ } while (stack >= (unsigned long *) (0x7fffffff - _STK_LIM));
+ }
+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) */
diff -urpN linux-2.5.45/arch/s390/mm/fault.c linux-2.5.45-ltt/arch/s390/mm/fault.c
--- linux-2.5.45/arch/s390/mm/fault.c Wed Oct 30 19:43:37 2002
+++ linux-2.5.45-ltt/arch/s390/mm/fault.c Wed Oct 30 20:51:10 2002
@@ -5,6 +5,7 @@
* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Hartmut Penner (hp@de.ibm.com)
* Ulrich Weigand (uweigand@de.ibm.com)
+ * Portions added by T. Halloran: (C) Copyright 2002 IBM Poughkeepsie, IBM Corporation
*
* Derived from "arch/i386/mm/fault.c"
* Copyright (C) 1995 Linus Torvalds
@@ -25,6 +26,7 @@
#include <linux/compatmac.h>
#include <linux/init.h>
#include <linux/console.h>
+#include <linux/trace.h>

#include <asm/system.h>
#include <asm/uaccess.h>
@@ -153,6 +155,8 @@ extern inline void do_exception(struct p
int user_address;
unsigned long fixup;
int si_code = SEGV_MAPERR;
+ trapid_t ltt_interruption_code;
+ char * ic_ptr = (char *) &ltt_interruption_code;

tsk = current;
mm = tsk->mm;
@@ -200,6 +204,9 @@ extern inline void do_exception(struct p
*/
local_irq_enable();

+ memset(&ltt_interruption_code,0,sizeof(ltt_interruption_code));
+ memcpy(ic_ptr+4,&error_code,sizeof(error_code));
+ TRACE_TRAP_ENTRY(ltt_interruption_code,(regs->psw.addr & PSW_ADDR_MASK));
down_read(&mm->mmap_sem);

vma = find_vma(mm, address);
@@ -248,6 +255,7 @@ survive:
}

up_read(&mm->mmap_sem);
+ TRACE_TRAP_EXIT();
return;

/*
@@ -262,6 +270,7 @@ bad_area:
tsk->thread.prot_addr = address;
tsk->thread.trap_no = error_code;
force_sigsegv(regs, error_code, si_code, address);
+ TRACE_TRAP_EXIT();
return;
}

@@ -269,6 +278,7 @@ no_context:
/* Are we prepared to handle this kernel fault? */
if ((fixup = search_exception_table(regs->psw.addr)) != 0) {
regs->psw.addr = fixup;
+ TRACE_TRAP_EXIT();
return;
}

@@ -316,6 +326,8 @@ do_sigbus:
/* Kernel mode? Handle exceptions or die */
if (!(regs->psw.mask & PSW_MASK_PSTATE))
goto no_context;
+
+ TRACE_TRAP_EXIT();
}

void do_protection_exception(struct pt_regs *regs, unsigned long error_code)
diff -urpN linux-2.5.45/drivers/s390/cio/cio.c linux-2.5.45-ltt/drivers/s390/cio/cio.c
--- linux-2.5.45/drivers/s390/cio/cio.c Wed Oct 30 19:43:44 2002
+++ linux-2.5.45-ltt/drivers/s390/cio/cio.c Wed Oct 30 20:51:12 2002
@@ -18,6 +18,8 @@
#include <linux/config.h>
#include <linux/slab.h>

+#include <linux/trace.h>
+
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/delay.h>
@@ -945,9 +947,11 @@ do_IRQ (struct pt_regs regs)
}

irq_enter ();
+ TRACE_IRQ_ENTRY(irq, !(((regs).psw.mask&PSW_PROBLEM_STATE) != 0));
s390irq_spin_lock (irq);
s390_process_IRQ (irq);
s390irq_spin_unlock (irq);
+ TRACE_IRQ_EXIT();
irq_exit ();
}

diff -urpN linux-2.5.45/drivers/s390/s390mach.c linux-2.5.45-ltt/drivers/s390/s390mach.c
--- linux-2.5.45/drivers/s390/s390mach.c Wed Oct 30 19:43:44 2002
+++ linux-2.5.45-ltt/drivers/s390/s390mach.c Wed Oct 30 20:51:13 2002
@@ -5,6 +5,7 @@
* S390 version
* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Ingo Adlung (adlung@de.ibm.com)
+ * Portions added by T. Halloran: (C) Copyright 2002 IBM Poughkeepsie, IBM Corporation
*/

#include <linux/config.h>
@@ -12,6 +13,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/completion.h>
+#include <linux/trace.h>
#ifdef CONFIG_SMP
#include <linux/smp.h>
#endif
@@ -179,10 +181,20 @@ s390_do_machine_check(void)
{
int crw_count;
mcic_t mcic;
+ trapid_t ltt_interruption_code;
+ uint32_t ltt_old_psw;

DBG(KERN_INFO "s390_do_machine_check : starting ...\n");

memcpy(&mcic, &S390_lowcore.mcck_interruption_code, sizeof (__u64));
+ memcpy( &ltt_interruption_code,
+ &S390_lowcore.mcck_interruption_code,
+ sizeof(__u64));
+ memcpy( &ltt_old_psw,
+ &S390_lowcore.mcck_old_psw,
+ sizeof(uint32_t));
+ ltt_old_psw &= PSW_ADDR_MASK;
+ TRACE_TRAP_ENTRY(ltt_interruption_code,ltt_old_psw);

if (mcic.mcc.mcd.sd) /* system damage */
s390_handle_damage("received system damage machine check\n");
diff -urpN linux-2.5.45/include/asm-s390/trace.h linux-2.5.45-ltt/include/asm-s390/trace.h
--- linux-2.5.45/include/asm-s390/trace.h Wed Dec 31 19:00:00 1969
+++ linux-2.5.45-ltt/include/asm-s390/trace.h Wed Oct 30 20:51:14 2002
@@ -0,0 +1,16 @@
+/*
+ * linux/include/asm-s390/trace.h
+ *
+ * Copyright (C) 2002, Karim Yaghmour
+ *
+ * S/390 definitions for tracing system
+ */
+
+#include <linux/trace.h>
+#include <asm-generic/trace.h>
+
+/* Current arch type */
+#define TRACE_ARCH_TYPE TRACE_ARCH_TYPE_S390
+
+/* Current variant type */
+#define TRACE_ARCH_VARIANT TRACE_ARCH_VARIANT_NONE
-
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