forked from Minki/linux
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
parent
1af2fe45fe
commit
cb3a86c89e
@ -137,12 +137,4 @@ config SH64_SR_WATCH
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bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
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depends on SUPERH64
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config POOR_MANS_STRACE
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bool "Debug: enable rudimentary strace facility"
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depends on SUPERH64
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help
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This option allows system calls to be traced to the console. It also
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aids in detecting kernel stack underflow. It is useful for debugging
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early-userland problems (e.g. init incurring fatal exceptions.)
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endmenu
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@ -193,7 +193,7 @@ zImage uImage uImage.srec vmlinux.srec: vmlinux
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compressed: zImage
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archprepare: maketools arch/sh/lib64/syscalltab.h
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archprepare: maketools
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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@ -205,34 +205,4 @@ define archhelp
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@echo ' uImage.srec - Create an S-record for U-Boot'
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endef
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define filechk_gen-syscalltab
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(set -e; \
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echo "/*"; \
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echo " * DO NOT MODIFY."; \
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echo " *"; \
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echo " * This file was generated by arch/sh/Makefile"; \
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echo " * Any changes will be reverted at build time."; \
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echo " */"; \
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echo ""; \
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echo "#ifndef __SYSCALLTAB_H"; \
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echo "#define __SYSCALLTAB_H"; \
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echo ""; \
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echo "#include <linux/kernel.h>"; \
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echo ""; \
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echo "struct syscall_info {"; \
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echo " const char *name;"; \
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echo "} syscall_info_table[] = {"; \
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sed -e '/^.*\.long /!d;s// { "/;s/\(\([^/]*\)\/\)\{1\}.*/\2/; \
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s/[ \t]*$$//g;s/$$/" },/;s/\("\)sys_/\1/g'; \
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echo "};"; \
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echo ""; \
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echo "#define NUM_SYSCALL_INFO_ENTRIES ARRAY_SIZE(syscall_info_table)";\
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echo ""; \
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echo "#endif /* __SYSCALLTAB_H */" )
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endef
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arch/sh/lib64/syscalltab.h: arch/sh/kernel/syscalls_64.S
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$(call filechk,gen-syscalltab)
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CLEAN_FILES += arch/sh/lib64/syscalltab.h \
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include/asm-sh/machtypes.h
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CLEAN_FILES += include/asm-sh/machtypes.h
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@ -812,27 +812,6 @@ no_underflow:
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! exceptions
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add SP, ZERO, r14
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#ifdef CONFIG_POOR_MANS_STRACE
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/* We've pushed all the registers now, so only r2-r4 hold anything
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* useful. Move them into callee save registers */
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or r2, ZERO, r28
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or r3, ZERO, r29
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or r4, ZERO, r30
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/* Preserve r2 as the event code */
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movi evt_debug, r3
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ori r3, 1, r3
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ptabs r3, tr0
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or SP, ZERO, r6
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getcon TRA, r5
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blink tr0, LINK
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or r28, ZERO, r2
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or r29, ZERO, r3
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or r30, ZERO, r4
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#endif
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/* For syscall and debug race condition, get TRA now */
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getcon TRA, r5
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@ -887,11 +866,6 @@ no_underflow:
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*/
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.global ret_from_irq
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ret_from_irq:
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#ifdef CONFIG_POOR_MANS_STRACE
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pta evt_debug_ret_from_irq, tr0
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ori SP, 0, r2
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blink tr0, LINK
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#endif
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ld.q SP, FRAME_S(FSSR), r6
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shlri r6, 30, r6
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andi r6, 1, r6
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@ -905,12 +879,6 @@ ret_from_irq:
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ret_from_exception:
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preempt_stop()
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#ifdef CONFIG_POOR_MANS_STRACE
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pta evt_debug_ret_from_exc, tr0
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ori SP, 0, r2
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blink tr0, LINK
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#endif
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ld.q SP, FRAME_S(FSSR), r6
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shlri r6, 30, r6
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andi r6, 1, r6
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@ -1236,18 +1204,6 @@ syscall_bad:
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.global syscall_ret
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syscall_ret:
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st.q SP, FRAME_R(9), r2 /* Expecting SP back to BASIC frame */
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#ifdef CONFIG_POOR_MANS_STRACE
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/* nothing useful in registers at this point */
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movi evt_debug2, r5
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ori r5, 1, r5
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ptabs r5, tr0
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ld.q SP, FRAME_R(9), r2
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or SP, ZERO, r3
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blink tr0, LINK
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#endif
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ld.q SP, FRAME_S(FSPC), r2
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addi r2, 4, r2 /* Move PC, being pre-execution event */
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st.q SP, FRAME_S(FSPC), r2
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@ -1268,25 +1224,12 @@ ret_from_fork:
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ptabs r5, tr0
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blink tr0, LINK
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#ifdef CONFIG_POOR_MANS_STRACE
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/* nothing useful in registers at this point */
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movi evt_debug2, r5
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ori r5, 1, r5
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ptabs r5, tr0
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ld.q SP, FRAME_R(9), r2
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or SP, ZERO, r3
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blink tr0, LINK
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#endif
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ld.q SP, FRAME_S(FSPC), r2
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addi r2, 4, r2 /* Move PC, being pre-execution event */
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st.q SP, FRAME_S(FSPC), r2
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pta ret_from_syscall, tr0
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blink tr0, ZERO
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syscall_allowed:
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/* Use LINK to deflect the exit point, default is syscall_ret */
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pta syscall_ret, tr0
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1
arch/sh/lib64/.gitignore
vendored
1
arch/sh/lib64/.gitignore
vendored
@ -1 +0,0 @@
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syscalltab.h
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@ -135,140 +135,6 @@ void print_itlb(void)
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(" =============================================================\n");
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}
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/* ======================================================================= */
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#ifdef CONFIG_POOR_MANS_STRACE
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#include "syscalltab.h"
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struct ring_node {
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int evt;
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int ret_addr;
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int event;
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int tra;
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int pid;
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unsigned long sp;
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unsigned long pc;
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};
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static struct ring_node event_ring[16];
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static int event_ptr = 0;
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struct stored_syscall_data {
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int pid;
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int syscall_number;
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};
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#define N_STORED_SYSCALLS 16
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static struct stored_syscall_data stored_syscalls[N_STORED_SYSCALLS];
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static int syscall_next=0;
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static int syscall_next_print=0;
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void evt_debug(int evt, int ret_addr, int event, int tra, struct pt_regs *regs)
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{
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int syscallno = tra & 0xff;
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unsigned long sp;
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unsigned long stack_bottom;
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int pid;
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struct ring_node *rr;
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pid = current->pid;
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stack_bottom = (unsigned long) task_stack_page(current);
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asm volatile("ori r15, 0, %0" : "=r" (sp));
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rr = event_ring + event_ptr;
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rr->evt = evt;
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rr->ret_addr = ret_addr;
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rr->event = event;
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rr->tra = tra;
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rr->pid = pid;
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rr->sp = sp;
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rr->pc = regs->pc;
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if (sp < stack_bottom + 3092) {
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int i, j;
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printk("evt_debug : stack underflow report\n");
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for (j=0, i = event_ptr; j<16; j++) {
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rr = event_ring + i;
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printk("evt=%08x event=%08x tra=%08x pid=%5d sp=%08lx pc=%08lx\n",
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rr->evt, rr->event, rr->tra, rr->pid, rr->sp, rr->pc);
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i--;
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i &= 15;
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}
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panic("STACK UNDERFLOW\n");
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}
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event_ptr = (event_ptr + 1) & 15;
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if ((event == 2) && (evt == 0x160)) {
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if (syscallno < NUM_SYSCALL_INFO_ENTRIES) {
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/* Store the syscall information to print later. We
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* can't print this now - currently we're running with
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* SR.BL=1, so we can't take a tlbmiss (which could occur
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* in the console drivers under printk).
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*
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* Just overwrite old entries on ring overflow - this
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* is only for last-hope debugging. */
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stored_syscalls[syscall_next].pid = current->pid;
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stored_syscalls[syscall_next].syscall_number = syscallno;
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syscall_next++;
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syscall_next &= (N_STORED_SYSCALLS - 1);
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}
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}
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}
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static void drain_syscalls(void) {
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while (syscall_next_print != syscall_next) {
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printk("Task %d: %s()\n",
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stored_syscalls[syscall_next_print].pid,
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syscall_info_table[stored_syscalls[syscall_next_print].syscall_number].name);
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syscall_next_print++;
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syscall_next_print &= (N_STORED_SYSCALLS - 1);
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}
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}
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void evt_debug2(unsigned int ret)
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{
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drain_syscalls();
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printk("Task %d: syscall returns %08x\n", current->pid, ret);
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}
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void evt_debug_ret_from_irq(struct pt_regs *regs)
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{
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int pid;
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struct ring_node *rr;
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pid = current->pid;
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rr = event_ring + event_ptr;
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rr->evt = 0xffff;
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rr->ret_addr = 0;
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rr->event = 0;
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rr->tra = 0;
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rr->pid = pid;
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rr->pc = regs->pc;
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event_ptr = (event_ptr + 1) & 15;
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}
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void evt_debug_ret_from_exc(struct pt_regs *regs)
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{
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int pid;
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struct ring_node *rr;
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pid = current->pid;
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rr = event_ring + event_ptr;
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rr->evt = 0xfffe;
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rr->ret_addr = 0;
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rr->event = 0;
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rr->tra = 0;
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rr->pid = pid;
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rr->pc = regs->pc;
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event_ptr = (event_ptr + 1) & 15;
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}
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#endif /* CONFIG_POOR_MANS_STRACE */
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/* ======================================================================= */
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void show_excp_regs(char *from, int trapnr, int signr, struct pt_regs *regs)
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{
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