[PATCH] LTT for 2.5.44-bk2 8/10: SuperH trace support

Karim Yaghmour
2002-10-29T21:53:00Z

D: This patch adds the bare-minimum SuperH-specific low-level trace
D: statements.

diffstat:
arch/sh/kernel/entry.S | 43 ++++++++++++++++++++++++
arch/sh/kernel/irq.c | 14 ++++++++
arch/sh/kernel/process.c | 13 ++++++-
arch/sh/kernel/sys_sh.c | 4 ++
arch/sh/kernel/traps.c | 82 +++++++++++++++++++++++++++++++++++++++++++++--
arch/sh/mm/fault.c | 15 ++++++++
include/asm-sh/trace.h | 16 +++++++++
7 files changed, 184 insertions(+), 3 deletions(-)

diff -urpN linux-2.5.44-bk2/arch/sh/kernel/entry.S linux-2.5.44-bk2-ltt/arch/sh/kernel/entry.S
--- linux-2.5.44-bk2/arch/sh/kernel/entry.S Sat Oct 19 00:01:48 2002
+++ linux-2.5.44-bk2-ltt/arch/sh/kernel/entry.S Tue Oct 29 15:24:18 2002
@@ -370,6 +370,20 @@ system_call:
mov.l r10, @r14 ! set syscall_nr
STI()
!
+#if (CONFIG_TRACE)
+ ! TODO: for i386 this code only happens when not ptrace'd
+ mov r15, r4 ! pass pt_regs* as first arg
+ mov.l __trsen, r11 ! Call trace_real_syscall_entry()
+ jsr @r11 ! (will chomp R[0-7])
+ nop
+ ! Reload R4-R7 from kernel stack
+ mov.l @(OFF_R4,r15), r4 ! arg0
+ mov.l @(OFF_R5,r15), r5
+ mov.l @(OFF_R6,r15), r6
+ mov.l @(OFF_R7,r15), r7 ! arg3
+ mov.l @(OFF_R3,r15), r3 ! syscall_nr
+#endif
+
stc k_current, r11
#error mov.l @(tsk_ptrace,r11), r10 ! Is current PTRACE_SYSCALL'd?
#error mov #PT_TRACESYS, r11
@@ -421,6 +435,14 @@ system_call:
! In case of trace
syscall_ret_trace:
mov.l r0, @(OFF_R0,r15) ! save the return value
+
+#if (CONFIG_TRACE)
+ ! TODO: for i386 this code only happens when not ptrace'd
+ mov.l __trsex, r1 ! Call trace_real_syscall_exit()
+ jsr @r1
+ nop
+#endif
+
mov.l __syscall_trace, r1
mova ret_from_syscall, r0
jmp @r1 ! Call syscall_trace() which notifies superior
@@ -504,6 +526,14 @@ __syscall_ret_trace:
.long syscall_ret_trace
__syscall_ret:
.long syscall_ret
+
+#if (CONFIG_TRACE)
+__trsen:
+ .long trace_real_syscall_entry
+__trsex:
+ .long trace_real_syscall_exit
+#endif
+
__INV_IMASK:
.long 0xffffff0f ! ~(IMASK)

@@ -536,6 +566,14 @@ old_abi_syscall_ret:
#endif
syscall_ret:
mov.l r0, @(OFF_R0,r15) ! save the return value
+
+#if (CONFIG_TRACE)
+ ! TODO: for i386 this code only happens when not ptrace'd
+ mov.l __trsex2, r1 ! Call trace_real_syscall_exit()
+ jsr @r1
+ nop
+#endif
+
/* fall through */

ENTRY(ret_from_syscall)
@@ -563,6 +601,11 @@ __do_signal:
#error .long do_signal
__irq_stat:
.long irq_stat
+#if (CONFIG_TRACE)
+__trsex2:
+ .long trace_real_syscall_exit
+#endif
+

.align 2
restore_all:
diff -urpN linux-2.5.44-bk2/arch/sh/kernel/irq.c linux-2.5.44-bk2-ltt/arch/sh/kernel/irq.c
--- linux-2.5.44-bk2/arch/sh/kernel/irq.c Sat Oct 19 00:01:23 2002
+++ linux-2.5.44-bk2-ltt/arch/sh/kernel/irq.c Tue Oct 29 15:24:18 2002
@@ -30,6 +30,8 @@
#include <linux/init.h>
#include <linux/seq_file.h>

+#include <linux/trace.h>
+
#include <asm/system.h>
#include <asm/io.h>
#include <asm/bitops.h>
@@ -127,6 +129,12 @@ int handle_IRQ_event(unsigned int irq, s

irq_enter(cpu, irq);

+#if (CONFIG_TRACE)
+ if (irq != TIMER_IRQ) { /* avoid double-reporting the timer IRQ */
+ TRACE_IRQ_ENTRY(irq, !(user_mode(regs)));
+ }
+#endif
+
status = 1; /* Force the "do bottom halves" bit */

if (!(action->flags & SA_INTERRUPT))
@@ -143,6 +151,12 @@ int handle_IRQ_event(unsigned int irq, s

irq_exit(cpu, irq);

+#if (CONFIG_TRACE)
+ if (irq != TIMER_IRQ) { /* avoid double-reporting the timer IRQ */
+ TRACE_IRQ_EXIT();
+ }
+#endif
+
return status;
}

diff -urpN linux-2.5.44-bk2/arch/sh/kernel/process.c linux-2.5.44-bk2-ltt/arch/sh/kernel/process.c
--- linux-2.5.44-bk2/arch/sh/kernel/process.c Sat Oct 19 00:02:27 2002
+++ linux-2.5.44-bk2-ltt/arch/sh/kernel/process.c Tue Oct 29 15:24:18 2002
@@ -16,6 +16,8 @@
#include <linux/slab.h>
#include <linux/a.out.h>

+#include <linux/trace.h>
+
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
@@ -138,7 +140,16 @@ int kernel_thread(int (*fn)(void *), voi
: "i" (__NR_exit), "r" (__sc3), "r" (__sc4), "r" (__sc5),
"r" (__sc8), "r" (__sc9)
: "memory", "t");
- return __sc0;
+#if (CONFIG_TRACE)
+ {
+ volatile unsigned long retval = __sc0;
+ if (retval > 0)
+ TRACE_PROCESS(TRACE_EV_PROCESS_KTHREAD, retval, (int) fn);
+ return retval;
+ }
+#else
+ return __sc0;
+#endif
}

/*
diff -urpN linux-2.5.44-bk2/arch/sh/kernel/sys_sh.c linux-2.5.44-bk2-ltt/arch/sh/kernel/sys_sh.c
--- linux-2.5.44-bk2/arch/sh/kernel/sys_sh.c Sat Oct 19 00:03:00 2002
+++ linux-2.5.44-bk2-ltt/arch/sh/kernel/sys_sh.c Tue Oct 29 15:24:18 2002
@@ -21,6 +21,8 @@
#include <linux/file.h>
#include <linux/utsname.h>

+#include <linux/trace.h>
+
#include <asm/uaccess.h>
#include <asm/ipc.h>

@@ -139,6 +141,8 @@ asmlinkage int sys_ipc(uint call, int fi
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;

+ TRACE_IPC(TRACE_EV_IPC_CALL, call, first);
+
if (call <= SEMCTL)
switch (call) {
case SEMOP:
diff -urpN linux-2.5.44-bk2/arch/sh/kernel/traps.c linux-2.5.44-bk2-ltt/arch/sh/kernel/traps.c
--- linux-2.5.44-bk2/arch/sh/kernel/traps.c Sat Oct 19 00:01:08 2002
+++ linux-2.5.44-bk2-ltt/arch/sh/kernel/traps.c Tue Oct 29 15:24:18 2002
@@ -25,6 +25,8 @@
#include <linux/delay.h>
#include <linux/spinlock.h>

+#include <linux/trace.h>
+
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -42,7 +44,9 @@ asmlinkage void do_##name(unsigned long
sti(); \
tsk->thread.error_code = error_code; \
tsk->thread.trap_no = trapnr; \
+ TRACE_TRAP_ENTRY(trapnr, regs.pc); \
force_sig(signr, tsk); \
+ TRACE_TRAP_EXIT(); \
die_if_no_fixup(str,&regs,error_code); \
}

@@ -464,6 +468,8 @@ asmlinkage void do_address_error(struct

asm volatile("stc r2_bank,%0": "=r" (error_code));

+ TRACE_TRAP_ENTRY(error_code >> 5, regs->pc);
+
oldfs = get_fs();

if (user_mode(regs)) {
@@ -487,8 +493,10 @@ asmlinkage void do_address_error(struct
tmp = handle_unaligned_access(instruction, regs);
set_fs(oldfs);

- if (tmp==0)
- return; /* sorted */
+ if (tmp==0) {
+ TRACE_TRAP_EXIT();
+ return; /* sorted */
+ }

uspace_segv:
printk(KERN_NOTICE "Killing process \"%s\" due to unaligned access\n", current->comm);
@@ -509,6 +517,7 @@ asmlinkage void do_address_error(struct
handle_unaligned_access(instruction, regs);
set_fs(oldfs);
}
+ TRACE_TRAP_EXIT();
}

DO_ERROR(12, SIGILL, "reserved instruction", reserved_inst, current)
@@ -586,3 +595,72 @@ void show_trace_task(struct task_struct
{
printk("Backtrace not yet implemented for SH.\n");
}
+
+/* Trace related code */
+#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;
+ trace_syscall_entry trace_syscall_event;
+
+ /* Set the syscall ID */
+ trace_syscall_event.syscall_id = (uint8_t) regs->regs[REG_REG0 + 3];
+
+ /* Set the address in any case */
+ trace_syscall_event.address = regs->pc;
+
+ /* 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->regs[REG_REG15];
+
+ /* Keep on going until we reach the end of the process' stack limit (wherever it may be) */
+ while (!get_user(addr, stack)) {
+ /* Does this LOOK LIKE an address in the program */
+ /* TODO: does this work with shared libraries?? - Greg Banks */
+ 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 */
+ stack++;
+ }
+ }
+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-2.5.44-bk2/arch/sh/mm/fault.c linux-2.5.44-bk2-ltt/arch/sh/mm/fault.c
--- linux-2.5.44-bk2/arch/sh/mm/fault.c Sat Oct 19 00:01:19 2002
+++ linux-2.5.44-bk2-ltt/arch/sh/mm/fault.c Tue Oct 29 15:24:18 2002
@@ -20,6 +20,8 @@
#include <linux/smp_lock.h>
#include <linux/interrupt.h>

+#include <linux/trace.h>
+
#include <asm/system.h>
#include <asm/io.h>
#include <asm/uaccess.h>
@@ -98,6 +100,14 @@ asmlinkage void do_page_fault(struct pt_
tsk = current;
mm = tsk->mm;

+#if (CONFIG_TRACE)
+ {
+ unsigned long trapnr;
+ asm volatile("stc r2_bank,%0": "=r" (trapnr));
+ TRACE_TRAP_ENTRY(trapnr >> 5, regs->pc); /* trap 4,5 or 6 */
+ }
+#endif
+
/*
* If we're in an interrupt or have no user
* context, we must not take the fault..
@@ -149,6 +159,7 @@ survive:
}

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

/*
@@ -162,6 +173,7 @@ bad_area:
tsk->thread.address = address;
tsk->thread.error_code = writeaccess;
force_sig(SIGSEGV, tsk);
+ TRACE_TRAP_EXIT();
return;
}

@@ -170,6 +182,7 @@ no_context:
fixup = search_exception_table(regs->pc);
if (fixup != 0) {
regs->pc = fixup;
+ TRACE_TRAP_EXIT();
return;
}

@@ -231,6 +244,8 @@ do_sigbus:
/* Kernel mode? Handle exceptions or die */
if (!user_mode(regs))
goto no_context;
+
+ TRACE_TRAP_EXIT();
}

/*
diff -urpN linux-2.5.44-bk2/include/asm-sh/trace.h linux-2.5.44-bk2-ltt/include/asm-sh/trace.h
--- linux-2.5.44-bk2/include/asm-sh/trace.h Wed Dec 31 19:00:00 1969
+++ linux-2.5.44-bk2-ltt/include/asm-sh/trace.h Tue Oct 29 15:24:18 2002
@@ -0,0 +1,16 @@
+/*
+ * linux/include/asm-sh/trace.h
+ *
+ * Copyright (C) 2002, Karim Yaghmour
+ *
+ * SuperH definitions for tracing system
+ */
+
+#include <linux/trace.h>
+#include <asm-generic/trace.h>
+
+/* Current arch type */
+#define TRACE_ARCH_TYPE TRACE_ARCH_TYPE_SH
+
+/* Current variant type */
+#define TRACE_ARCH_VARIANT TRACE_ARCH_VARIANT_NONE