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sh: Kill off sh64's hand-rolled syscall tracer. 

This is no longer necessary, as there are now sufficient generic
alternatives available.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-05-08 17:25:35 +09:00
parent 1af2fe45fe
commit cb3a86c89e
5 changed files with 2 additions and 232 deletions
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8
arch/sh/Kconfig.debug
View File

@ -137,12 +137,4 @@ config SH64_SR_WATCH
bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
depends on SUPERH64
config POOR_MANS_STRACE
bool "Debug: enable rudimentary strace facility"
depends on SUPERH64
help
This option allows system calls to be traced to the console. It also
aids in detecting kernel stack underflow. It is useful for debugging
early-userland problems (e.g. init incurring fatal exceptions.)
endmenu

34
arch/sh/Makefile
View File

@ -193,7 +193,7 @@ zImage uImage uImage.srec vmlinux.srec: vmlinux
compressed: zImage
archprepare: maketools arch/sh/lib64/syscalltab.h
archprepare: maketools
archclean:
$(Q)$(MAKE) $(clean)=$(boot)
@ -205,34 +205,4 @@ define archhelp
@echo ' uImage.srec - Create an S-record for U-Boot'
endef
define filechk_gen-syscalltab
(set -e; \
echo "/*"; \
echo " * DO NOT MODIFY."; \
echo " *"; \
echo " * This file was generated by arch/sh/Makefile"; \
echo " * Any changes will be reverted at build time."; \
echo " */"; \
echo ""; \
echo "#ifndef __SYSCALLTAB_H"; \
echo "#define __SYSCALLTAB_H"; \
echo ""; \
echo "#include <linux/kernel.h>"; \
echo ""; \
echo "struct syscall_info {"; \
echo " const char *name;"; \
echo "} syscall_info_table[] = {"; \
sed -e '/^.*\.long /!d;s// { "/;s/\(\([^/]*\)\/\)\{1\}.*/\2/; \
s/[ \t]*$$//g;s/$$/" },/;s/\("\)sys_/\1/g'; \
echo "};"; \
echo ""; \
echo "#define NUM_SYSCALL_INFO_ENTRIES ARRAY_SIZE(syscall_info_table)";\
echo ""; \
echo "#endif /* __SYSCALLTAB_H */" )
endef
arch/sh/lib64/syscalltab.h: arch/sh/kernel/syscalls_64.S
$(call filechk,gen-syscalltab)
CLEAN_FILES += arch/sh/lib64/syscalltab.h \
include/asm-sh/machtypes.h
CLEAN_FILES += include/asm-sh/machtypes.h

57
arch/sh/kernel/cpu/sh5/entry.S
View File

@ -812,27 +812,6 @@ no_underflow:
! exceptions
add SP, ZERO, r14
#ifdef CONFIG_POOR_MANS_STRACE
/* We've pushed all the registers now, so only r2-r4 hold anything
* useful. Move them into callee save registers */
or r2, ZERO, r28
or r3, ZERO, r29
or r4, ZERO, r30
/* Preserve r2 as the event code */
movi evt_debug, r3
ori r3, 1, r3
ptabs r3, tr0
or SP, ZERO, r6
getcon TRA, r5
blink tr0, LINK
or r28, ZERO, r2
or r29, ZERO, r3
or r30, ZERO, r4
#endif
/* For syscall and debug race condition, get TRA now */
getcon TRA, r5
@ -887,11 +866,6 @@ no_underflow:
*/
.global ret_from_irq
ret_from_irq:
#ifdef CONFIG_POOR_MANS_STRACE
pta evt_debug_ret_from_irq, tr0
ori SP, 0, r2
blink tr0, LINK
#endif
ld.q SP, FRAME_S(FSSR), r6
shlri r6, 30, r6
andi r6, 1, r6
@ -905,12 +879,6 @@ ret_from_irq:
ret_from_exception:
preempt_stop()
#ifdef CONFIG_POOR_MANS_STRACE
pta evt_debug_ret_from_exc, tr0
ori SP, 0, r2
blink tr0, LINK
#endif
ld.q SP, FRAME_S(FSSR), r6
shlri r6, 30, r6
andi r6, 1, r6
@ -1236,18 +1204,6 @@ syscall_bad:
.global syscall_ret
syscall_ret:
st.q SP, FRAME_R(9), r2 /* Expecting SP back to BASIC frame */
#ifdef CONFIG_POOR_MANS_STRACE
/* nothing useful in registers at this point */
movi evt_debug2, r5
ori r5, 1, r5
ptabs r5, tr0
ld.q SP, FRAME_R(9), r2
or SP, ZERO, r3
blink tr0, LINK
#endif
ld.q SP, FRAME_S(FSPC), r2
addi r2, 4, r2 /* Move PC, being pre-execution event */
st.q SP, FRAME_S(FSPC), r2
@ -1268,25 +1224,12 @@ ret_from_fork:
ptabs r5, tr0
blink tr0, LINK
#ifdef CONFIG_POOR_MANS_STRACE
/* nothing useful in registers at this point */
movi evt_debug2, r5
ori r5, 1, r5
ptabs r5, tr0
ld.q SP, FRAME_R(9), r2
or SP, ZERO, r3
blink tr0, LINK
#endif
ld.q SP, FRAME_S(FSPC), r2
addi r2, 4, r2 /* Move PC, being pre-execution event */
st.q SP, FRAME_S(FSPC), r2
pta ret_from_syscall, tr0
blink tr0, ZERO
syscall_allowed:
/* Use LINK to deflect the exit point, default is syscall_ret */
pta syscall_ret, tr0

1
arch/sh/lib64/.gitignore vendored
View File

@ -1 +0,0 @@
syscalltab.h

134
arch/sh/lib64/dbg.c
View File

@ -135,140 +135,6 @@ void print_itlb(void)
(" =============================================================\n");
}
/* ======================================================================= */
#ifdef CONFIG_POOR_MANS_STRACE
#include "syscalltab.h"
struct ring_node {
int evt;
int ret_addr;
int event;
int tra;
int pid;
unsigned long sp;
unsigned long pc;
};
static struct ring_node event_ring[16];
static int event_ptr = 0;
struct stored_syscall_data {
int pid;
int syscall_number;
};
#define N_STORED_SYSCALLS 16
static struct stored_syscall_data stored_syscalls[N_STORED_SYSCALLS];
static int syscall_next=0;
static int syscall_next_print=0;
void evt_debug(int evt, int ret_addr, int event, int tra, struct pt_regs *regs)
{
int syscallno = tra & 0xff;
unsigned long sp;
unsigned long stack_bottom;
int pid;
struct ring_node *rr;
pid = current->pid;
stack_bottom = (unsigned long) task_stack_page(current);
asm volatile("ori r15, 0, %0" : "=r" (sp));
rr = event_ring + event_ptr;
rr->evt = evt;
rr->ret_addr = ret_addr;
rr->event = event;
rr->tra = tra;
rr->pid = pid;
rr->sp = sp;
rr->pc = regs->pc;
if (sp < stack_bottom + 3092) {
int i, j;
printk("evt_debug : stack underflow report\n");
for (j=0, i = event_ptr; j<16; j++) {
rr = event_ring + i;
printk("evt=%08x event=%08x tra=%08x pid=%5d sp=%08lx pc=%08lx\n",
rr->evt, rr->event, rr->tra, rr->pid, rr->sp, rr->pc);
i--;
i &= 15;
}
panic("STACK UNDERFLOW\n");
}
event_ptr = (event_ptr + 1) & 15;
if ((event == 2) && (evt == 0x160)) {
if (syscallno < NUM_SYSCALL_INFO_ENTRIES) {
/* Store the syscall information to print later. We
* can't print this now - currently we're running with
* SR.BL=1, so we can't take a tlbmiss (which could occur
* in the console drivers under printk).
*
* Just overwrite old entries on ring overflow - this
* is only for last-hope debugging. */
stored_syscalls[syscall_next].pid = current->pid;
stored_syscalls[syscall_next].syscall_number = syscallno;
syscall_next++;
syscall_next &= (N_STORED_SYSCALLS - 1);
}
}
}
static void drain_syscalls(void) {
while (syscall_next_print != syscall_next) {
printk("Task %d: %s()\n",
stored_syscalls[syscall_next_print].pid,
syscall_info_table[stored_syscalls[syscall_next_print].syscall_number].name);
syscall_next_print++;
syscall_next_print &= (N_STORED_SYSCALLS - 1);
}
}
void evt_debug2(unsigned int ret)
{
drain_syscalls();
printk("Task %d: syscall returns %08x\n", current->pid, ret);
}
void evt_debug_ret_from_irq(struct pt_regs *regs)
{
int pid;
struct ring_node *rr;
pid = current->pid;
rr = event_ring + event_ptr;
rr->evt = 0xffff;
rr->ret_addr = 0;
rr->event = 0;
rr->tra = 0;
rr->pid = pid;
rr->pc = regs->pc;
event_ptr = (event_ptr + 1) & 15;
}
void evt_debug_ret_from_exc(struct pt_regs *regs)
{
int pid;
struct ring_node *rr;
pid = current->pid;
rr = event_ring + event_ptr;
rr->evt = 0xfffe;
rr->ret_addr = 0;
rr->event = 0;
rr->tra = 0;
rr->pid = pid;
rr->pc = regs->pc;
event_ptr = (event_ptr + 1) & 15;
}
#endif /* CONFIG_POOR_MANS_STRACE */
/* ======================================================================= */
void show_excp_regs(char *from, int trapnr, int signr, struct pt_regs *regs)
{