[PATCH 9/16] UML - Clean up the syscall path
From: Jeff Dike
Date: Mon Mar 07 2005 - 13:15:12 EST
This patch removes some useless code from the system call path, and
removes some debug code, which will reappear in a configurable form in
the syscall-debug patch.
Signed-off-by: Jeff Dike <jdike@xxxxxxxxxxx>
Index: linux-2.6.11/arch/um/kernel/Makefile
===================================================================
--- linux-2.6.11.orig/arch/um/kernel/Makefile 2005-03-05 12:07:34.000000000 -0500
+++ linux-2.6.11/arch/um/kernel/Makefile 2005-03-05 12:14:17.000000000 -0500
@@ -10,9 +10,9 @@
helper.o init_task.o irq.o irq_user.o ksyms.o main.o mem.o mem_user.o \
physmem.o process.o process_kern.o ptrace.o reboot.o resource.o \
sigio_user.o sigio_kern.o signal_kern.o signal_user.o smp.o \
- syscall_kern.o syscall_user.o sysrq.o sys_call_table.o tempfile.o \
- time.o time_kern.o tlb.o trap_kern.o trap_user.o uaccess_user.o \
- um_arch.o umid.o user_util.o
+ syscall_kern.o sysrq.o sys_call_table.o tempfile.o time.o time_kern.o \
+ tlb.o trap_kern.o trap_user.o uaccess_user.o um_arch.o umid.o \
+ user_util.o
obj-$(CONFIG_BLK_DEV_INITRD) += initrd_kern.o initrd_user.o
obj-$(CONFIG_GPROF) += gprof_syms.o
Index: linux-2.6.11/arch/um/kernel/skas/include/skas.h
===================================================================
--- linux-2.6.11.orig/arch/um/kernel/skas/include/skas.h 2005-03-05 12:07:35.000000000 -0500
+++ linux-2.6.11/arch/um/kernel/skas/include/skas.h 2005-03-05 12:14:58.000000000 -0500
@@ -30,6 +30,7 @@
extern void user_signal(int sig, union uml_pt_regs *regs);
extern int new_mm(int from);
extern void start_userspace(int cpu);
+extern long execute_syscall_skas(void *r);
#endif
Index: linux-2.6.11/arch/um/kernel/skas/syscall_user.c
===================================================================
--- linux-2.6.11.orig/arch/um/kernel/skas/syscall_user.c 2005-03-05 12:07:34.000000000 -0500
+++ linux-2.6.11/arch/um/kernel/skas/syscall_user.c 2005-03-05 12:14:17.000000000 -0500
@@ -9,22 +9,18 @@
#include "syscall_user.h"
#include "sysdep/ptrace.h"
#include "sysdep/sigcontext.h"
-
+#include "skas.h"
void handle_syscall(union uml_pt_regs *regs)
{
long result;
- int index;
-
- index = record_syscall_start(UPT_SYSCALL_NR(regs));
syscall_trace(regs, 0);
- result = execute_syscall(regs);
+ result = execute_syscall_skas(regs);
REGS_SET_SYSCALL_RETURN(regs->skas.regs, result);
syscall_trace(regs, 1);
- record_syscall_end(index, result);
}
/*
Index: linux-2.6.11/arch/um/kernel/syscall_kern.c
===================================================================
--- linux-2.6.11.orig/arch/um/kernel/syscall_kern.c 2005-03-05 12:07:34.000000000 -0500
+++ linux-2.6.11/arch/um/kernel/syscall_kern.c 2005-03-05 12:14:17.000000000 -0500
@@ -154,27 +154,6 @@
return error;
}
-long execute_syscall(void *r)
-{
- return(CHOOSE_MODE_PROC(execute_syscall_tt, execute_syscall_skas, r));
-}
-
-DEFINE_SPINLOCK(syscall_lock);
-
-static int syscall_index = 0;
-
-int next_syscall_index(int limit)
-{
- int ret;
-
- spin_lock(&syscall_lock);
- ret = syscall_index;
- if(++syscall_index == limit)
- syscall_index = 0;
- spin_unlock(&syscall_lock);
- return(ret);
-}
-
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
Index: linux-2.6.11/arch/um/kernel/tt/include/tt.h
===================================================================
--- linux-2.6.11.orig/arch/um/kernel/tt/include/tt.h 2005-03-05 12:07:34.000000000 -0500
+++ linux-2.6.11/arch/um/kernel/tt/include/tt.h 2005-03-05 12:14:17.000000000 -0500
@@ -30,6 +30,7 @@
extern void do_sigtrap(void *task);
extern int is_valid_pid(int pid);
extern void remap_data(void *segment_start, void *segment_end, int w);
+extern long execute_syscall_tt(void *r);
#endif
Index: linux-2.6.11/arch/um/kernel/tt/syscall_user.c
===================================================================
--- linux-2.6.11.orig/arch/um/kernel/tt/syscall_user.c 2005-03-05 12:07:34.000000000 -0500
+++ linux-2.6.11/arch/um/kernel/tt/syscall_user.c 2005-03-05 12:14:17.000000000 -0500
@@ -22,15 +22,14 @@
{
void *sc;
long result;
- int index, syscall;
+ int syscall;
syscall = UPT_SYSCALL_NR(regs);
sc = UPT_SC(regs);
SC_START_SYSCALL(sc);
- index = record_syscall_start(syscall);
syscall_trace(regs, 0);
- result = execute_syscall(regs);
+ result = execute_syscall_tt(regs);
/* regs->sc may have changed while the system call ran (there may
* have been an interrupt or segfault), so it needs to be refreshed.
@@ -40,7 +39,6 @@
SC_SET_SYSCALL_RETURN(sc, result);
syscall_trace(regs, 1);
- record_syscall_end(index, result);
}
void do_sigtrap(void *task)
Index: linux-2.6.11/arch/um/kernel/tt/tracer.c
===================================================================
--- linux-2.6.11.orig/arch/um/kernel/tt/tracer.c 2005-03-05 12:07:34.000000000 -0500
+++ linux-2.6.11/arch/um/kernel/tt/tracer.c 2005-03-05 12:14:17.000000000 -0500
@@ -184,9 +184,8 @@
int tracer(int (*init_proc)(void *), void *sp)
{
void *task = NULL;
- unsigned long eip = 0;
int status, pid = 0, sig = 0, cont_type, tracing = 0, op = 0;
- int last_index, proc_id = 0, n, err, old_tracing = 0, strace = 0;
+ int proc_id = 0, n, err, old_tracing = 0, strace = 0;
int local_using_sysemu = 0;
signal(SIGPIPE, SIG_IGN);
@@ -279,22 +278,6 @@
else if(WIFSTOPPED(status)){
proc_id = pid_to_processor_id(pid);
sig = WSTOPSIG(status);
- if(signal_index[proc_id] == 1024){
- signal_index[proc_id] = 0;
- last_index = 1023;
- }
- else last_index = signal_index[proc_id] - 1;
- if(((sig == SIGPROF) || (sig == SIGVTALRM) ||
- (sig == SIGALRM)) &&
- (signal_record[proc_id][last_index].signal == sig)&&
- (signal_record[proc_id][last_index].pid == pid))
- signal_index[proc_id] = last_index;
- signal_record[proc_id][signal_index[proc_id]].pid = pid;
- gettimeofday(&signal_record[proc_id][signal_index[proc_id]].time, NULL);
- eip = ptrace(PTRACE_PEEKUSER, pid, PT_IP_OFFSET, 0);
- signal_record[proc_id][signal_index[proc_id]].addr = eip;
- signal_record[proc_id][signal_index[proc_id]++].signal = sig;
-
if(proc_id == -1){
sleeping_process_signal(pid, sig);
continue;
-
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