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authorJeff Dike <jdike@addtoit.com>2007-10-16 01:26:58 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:05 -0700
commit77bf4400319db9d2a8af6b00c2be6faa0f3d07cb (patch)
treeddc8fd48349b8d4dd2c0b26bce7f52f79b4e4077 /arch/um/kernel/skas
parentae2587e41254e48e670346aefa332d7469d86352 (diff)
uml: remove code made redundant by CHOOSE_MODE removal
This patch makes a number of simplifications enabled by the removal of CHOOSE_MODE. There were lots of functions that looked like int foo(args){ foo_skas(args); } The bodies of foo_skas are now folded into foo, and their declarations (and sometimes entire header files) are deleted. In addition, the union uml_pt_regs, which was a union between the tt and skas register formats, is now a struct, with the tt-mode arm of the union being removed. It turns out that usr2_handler was unused, so it is gone. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/kernel/skas')
-rw-r--r--arch/um/kernel/skas/Makefile2
-rw-r--r--arch/um/kernel/skas/exec.c40
-rw-r--r--arch/um/kernel/skas/mem.c22
-rw-r--r--arch/um/kernel/skas/mmu.c4
-rw-r--r--arch/um/kernel/skas/process.c158
-rw-r--r--arch/um/kernel/skas/syscall.c4
-rw-r--r--arch/um/kernel/skas/tlb.c164
7 files changed, 13 insertions, 381 deletions
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
index 3e3fa7e7e3c..b2823cdd783 100644
--- a/arch/um/kernel/skas/Makefile
+++ b/arch/um/kernel/skas/Makefile
@@ -3,7 +3,7 @@
# Licensed under the GPL
#
-obj-y := clone.o exec.o mem.o mmu.o process.o syscall.o tlb.o uaccess.o
+obj-y := clone.o mmu.o process.o syscall.o uaccess.o
# clone.o is in the stub, so it can't be built with profiling
# GCC hardened also auto-enables -fpic, but we need %ebx so it can't work ->
diff --git a/arch/um/kernel/skas/exec.c b/arch/um/kernel/skas/exec.c
deleted file mode 100644
index 580eb646894..00000000000
--- a/arch/um/kernel/skas/exec.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include "linux/kernel.h"
-#include "asm/current.h"
-#include "asm/page.h"
-#include "asm/signal.h"
-#include "asm/ptrace.h"
-#include "asm/uaccess.h"
-#include "asm/mmu_context.h"
-#include "tlb.h"
-#include "skas.h"
-#include "um_mmu.h"
-#include "os.h"
-
-void flush_thread_skas(void)
-{
- void *data = NULL;
- unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
- int ret;
-
- ret = unmap(&current->mm->context.skas.id, 0, end, 1, &data);
- if(ret){
- printk("flush_thread_skas - clearing address space failed, "
- "err = %d\n", ret);
- force_sig(SIGKILL, current);
- }
-
- switch_mm_skas(&current->mm->context.skas.id);
-}
-
-void start_thread_skas(struct pt_regs *regs, unsigned long eip,
- unsigned long esp)
-{
- set_fs(USER_DS);
- PT_REGS_IP(regs) = eip;
- PT_REGS_SP(regs) = esp;
-}
diff --git a/arch/um/kernel/skas/mem.c b/arch/um/kernel/skas/mem.c
deleted file mode 100644
index 7c18dfcd7d8..00000000000
--- a/arch/um/kernel/skas/mem.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include "linux/mm.h"
-#include "asm/pgtable.h"
-#include "mem_user.h"
-#include "skas.h"
-
-unsigned long set_task_sizes_skas(unsigned long *task_size_out)
-{
- /* Round up to the nearest 4M */
- unsigned long host_task_size = ROUND_4M((unsigned long)
- &host_task_size);
-
- if (!skas_needs_stub)
- *task_size_out = host_task_size;
- else *task_size_out = CONFIG_STUB_START & PGDIR_MASK;
-
- return host_task_size;
-}
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index 2c6d090a2e8..902d7413895 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -71,7 +71,7 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
return(-ENOMEM);
}
-int init_new_context_skas(struct task_struct *task, struct mm_struct *mm)
+int init_new_context(struct task_struct *task, struct mm_struct *mm)
{
struct mmu_context_skas *from_mm = NULL;
struct mmu_context_skas *to_mm = &mm->context.skas;
@@ -137,7 +137,7 @@ int init_new_context_skas(struct task_struct *task, struct mm_struct *mm)
return ret;
}
-void destroy_context_skas(struct mm_struct *mm)
+void destroy_context(struct mm_struct *mm)
{
struct mmu_context_skas *mmu = &mm->context.skas;
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index 48051a98525..dabae62d52b 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -18,129 +18,22 @@
#include "os.h"
#include "tlb.h"
#include "kern.h"
-#include "mode.h"
#include "registers.h"
-void switch_to_skas(void *prev, void *next)
-{
- struct task_struct *from, *to;
-
- from = prev;
- to = next;
-
- /* XXX need to check runqueues[cpu].idle */
- if(current->pid == 0)
- switch_timers(0);
-
- switch_threads(&from->thread.mode.skas.switch_buf,
- &to->thread.mode.skas.switch_buf);
-
- arch_switch_to_skas(current->thread.prev_sched, current);
-
- if(current->pid == 0)
- switch_timers(1);
-}
-
extern void schedule_tail(struct task_struct *prev);
-/* This is called magically, by its address being stuffed in a jmp_buf
- * and being longjmp-d to.
- */
-void new_thread_handler(void)
-{
- int (*fn)(void *), n;
- void *arg;
-
- if(current->thread.prev_sched != NULL)
- schedule_tail(current->thread.prev_sched);
- current->thread.prev_sched = NULL;
-
- fn = current->thread.request.u.thread.proc;
- arg = current->thread.request.u.thread.arg;
-
- /* The return value is 1 if the kernel thread execs a process,
- * 0 if it just exits
- */
- n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
- if(n == 1){
- /* Handle any immediate reschedules or signals */
- interrupt_end();
- userspace(&current->thread.regs.regs);
- }
- else do_exit(0);
-}
-
-void release_thread_skas(struct task_struct *task)
-{
-}
-
-/* Called magically, see new_thread_handler above */
-void fork_handler(void)
-{
- force_flush_all();
- if(current->thread.prev_sched == NULL)
- panic("blech");
-
- schedule_tail(current->thread.prev_sched);
-
- /* XXX: if interrupt_end() calls schedule, this call to
- * arch_switch_to_skas isn't needed. We could want to apply this to
- * improve performance. -bb */
- arch_switch_to_skas(current->thread.prev_sched, current);
-
- current->thread.prev_sched = NULL;
-
-/* Handle any immediate reschedules or signals */
- interrupt_end();
-
- userspace(&current->thread.regs.regs);
-}
-
-int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
- unsigned long stack_top, struct task_struct * p,
- struct pt_regs *regs)
-{
- void (*handler)(void);
-
- if(current->thread.forking){
- memcpy(&p->thread.regs.regs.skas, &regs->regs.skas,
- sizeof(p->thread.regs.regs.skas));
- REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0);
- if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp;
-
- handler = fork_handler;
-
- arch_copy_thread(&current->thread.arch, &p->thread.arch);
- }
- else {
- init_thread_registers(&p->thread.regs.regs);
- p->thread.request.u.thread = current->thread.request.u.thread;
- handler = new_thread_handler;
- }
-
- new_thread(task_stack_page(p), &p->thread.mode.skas.switch_buf,
- handler);
- return(0);
-}
-
int new_mm(unsigned long stack)
{
int fd;
fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
if(fd < 0)
- return(fd);
+ return fd;
if(skas_needs_stub)
map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);
- return(fd);
-}
-
-void init_idle_skas(void)
-{
- cpu_tasks[current_thread->cpu].pid = os_getpid();
- default_idle();
+ return fd;
}
extern void start_kernel(void);
@@ -158,14 +51,14 @@ static int __init start_kernel_proc(void *unused)
cpu_online_map = cpumask_of_cpu(0);
#endif
start_kernel();
- return(0);
+ return 0;
}
extern int userspace_pid[];
extern char cpu0_irqstack[];
-int __init start_uml_skas(void)
+int __init start_uml(void)
{
stack_protections((unsigned long) &cpu0_irqstack);
set_sigstack(cpu0_irqstack, THREAD_SIZE);
@@ -176,49 +69,14 @@ int __init start_uml_skas(void)
init_task.thread.request.u.thread.proc = start_kernel_proc;
init_task.thread.request.u.thread.arg = NULL;
- return(start_idle_thread(task_stack_page(&init_task),
- &init_task.thread.mode.skas.switch_buf));
-}
-
-int external_pid_skas(struct task_struct *task)
-{
- /* FIXME: Need to look up userspace_pid by cpu */
- return(userspace_pid[0]);
-}
-
-int thread_pid_skas(struct task_struct *task)
-{
- /* FIXME: Need to look up userspace_pid by cpu */
- return(userspace_pid[0]);
-}
-
-void kill_off_processes_skas(void)
-{
- if(proc_mm)
- /*
- * FIXME: need to loop over userspace_pids in
- * kill_off_processes_skas
- */
- os_kill_ptraced_process(userspace_pid[0], 1);
- else {
- struct task_struct *p;
- int pid, me;
-
- me = os_getpid();
- for_each_process(p){
- if(p->mm == NULL)
- continue;
-
- pid = p->mm->context.skas.id.u.pid;
- os_kill_ptraced_process(pid, 1);
- }
- }
+ return start_idle_thread(task_stack_page(&init_task),
+ &init_task.thread.switch_buf);
}
unsigned long current_stub_stack(void)
{
if(current->mm == NULL)
- return(0);
+ return 0;
- return(current->mm->context.skas.id.stack);
+ return current->mm->context.skas.id.stack;
}
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
index 0ae4eea21be..e183da633c8 100644
--- a/arch/um/kernel/skas/syscall.c
+++ b/arch/um/kernel/skas/syscall.c
@@ -13,7 +13,7 @@
#include "kern_util.h"
#include "syscall.h"
-void handle_syscall(union uml_pt_regs *r)
+void handle_syscall(struct uml_pt_regs *r)
{
struct pt_regs *regs = container_of(r, struct pt_regs, regs);
long result;
@@ -37,7 +37,7 @@ void handle_syscall(union uml_pt_regs *r)
result = -ENOSYS;
else result = EXECUTE_SYSCALL(syscall, regs);
- REGS_SET_SYSCALL_RETURN(r->skas.regs, result);
+ REGS_SET_SYSCALL_RETURN(r->regs, result);
syscall_trace(r, 1);
}
diff --git a/arch/um/kernel/skas/tlb.c b/arch/um/kernel/skas/tlb.c
deleted file mode 100644
index c0f0693743b..00000000000
--- a/arch/um/kernel/skas/tlb.c
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Copyright 2003 PathScale, Inc.
- * Licensed under the GPL
- */
-
-#include "linux/stddef.h"
-#include "linux/sched.h"
-#include "linux/mm.h"
-#include "asm/page.h"
-#include "asm/pgtable.h"
-#include "asm/mmu.h"
-#include "mem_user.h"
-#include "mem.h"
-#include "skas.h"
-#include "os.h"
-#include "tlb.h"
-
-static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
- int finished, void **flush)
-{
- struct host_vm_op *op;
- int i, ret = 0;
-
- for(i = 0; i <= last && !ret; i++){
- op = &ops[i];
- switch(op->type){
- case MMAP:
- ret = map(&mmu->skas.id, op->u.mmap.addr,
- op->u.mmap.len, op->u.mmap.prot,
- op->u.mmap.fd, op->u.mmap.offset, finished,
- flush);
- break;
- case MUNMAP:
- ret = unmap(&mmu->skas.id, op->u.munmap.addr,
- op->u.munmap.len, finished, flush);
- break;
- case MPROTECT:
- ret = protect(&mmu->skas.id, op->u.mprotect.addr,
- op->u.mprotect.len, op->u.mprotect.prot,
- finished, flush);
- break;
- default:
- printk("Unknown op type %d in do_ops\n", op->type);
- break;
- }
- }
-
- return ret;
-}
-
-extern int proc_mm;
-
-static void fix_range(struct mm_struct *mm, unsigned long start_addr,
- unsigned long end_addr, int force)
-{
- if(!proc_mm && (end_addr > CONFIG_STUB_START))
- end_addr = CONFIG_STUB_START;
-
- fix_range_common(mm, start_addr, end_addr, force, do_ops);
-}
-
-void __flush_tlb_one_skas(unsigned long addr)
-{
- flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
-}
-
-void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start,
- unsigned long end)
-{
- if(vma->vm_mm == NULL)
- flush_tlb_kernel_range_common(start, end);
- else fix_range(vma->vm_mm, start, end, 0);
-}
-
-void flush_tlb_mm_skas(struct mm_struct *mm)
-{
- unsigned long end;
-
- /* Don't bother flushing if this address space is about to be
- * destroyed.
- */
- if(atomic_read(&mm->mm_users) == 0)
- return;
-
- end = proc_mm ? task_size : CONFIG_STUB_START;
- fix_range(mm, 0, end, 0);
-}
-
-void force_flush_all_skas(void)
-{
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma = mm->mmap;
-
- while(vma != NULL) {
- fix_range(mm, vma->vm_start, vma->vm_end, 1);
- vma = vma->vm_next;
- }
-}
-
-void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
-{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- struct mm_struct *mm = vma->vm_mm;
- void *flush = NULL;
- int r, w, x, prot, err = 0;
- struct mm_id *mm_id;
-
- pgd = pgd_offset(mm, address);
- if(!pgd_present(*pgd))
- goto kill;
-
- pud = pud_offset(pgd, address);
- if(!pud_present(*pud))
- goto kill;
-
- pmd = pmd_offset(pud, address);
- if(!pmd_present(*pmd))
- goto kill;
-
- pte = pte_offset_kernel(pmd, address);
-
- r = pte_read(*pte);
- w = pte_write(*pte);
- x = pte_exec(*pte);
- if (!pte_young(*pte)) {
- r = 0;
- w = 0;
- } else if (!pte_dirty(*pte)) {
- w = 0;
- }
-
- mm_id = &mm->context.skas.id;
- prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
- (x ? UM_PROT_EXEC : 0));
- if(pte_newpage(*pte)){
- if(pte_present(*pte)){
- unsigned long long offset;
- int fd;
-
- fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
- err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
- 1, &flush);
- }
- else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
- }
- else if(pte_newprot(*pte))
- err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
-
- if(err)
- goto kill;
-
- *pte = pte_mkuptodate(*pte);
-
- return;
-
-kill:
- printk("Failed to flush page for address 0x%lx\n", address);
- force_sig(SIGKILL, current);
-}
-