From: Jeff Dike Date: Tue, 16 Oct 2007 08:27:33 +0000 (-0700) Subject: uml: fix stub address calculations X-Git-Tag: v2.6.24-rc1~1026 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=54ae36f24b103e521dd683f66fe72b0584ccb7e2;p=linux-2.6-omap-h63xx.git uml: fix stub address calculations The calculation of CONFIG_STUB_CODE and CONFIG_STUB_DATA didn't take into account anything but 3G/1G and 2G/2G, leaving the other vmsplits out in the cold. I'd rather not duplicate the four known host vmsplit cases for each of these symbols. I'd also like to calculate them based on the highest userspace address. The Kconfig language seems not to allow calculation of hex constants, so I moved this to as-layout.h. CONFIG_STUB_CODE, CONFIG_STUB_DATA, and CONFIG_STUB_START are now gone. In their place are STUB_CODE, STUB_DATA, and STUB_START in as-layout.h. i386 and x86_64 seem to differ as to whether an unadorned constant is an int or a long, so I cast them to unsigned long so they can be printed consistently. However, they are also used in stub.S, where C types don't work so well. So, there are ASM_ versions of these constants for use in stub.S. I also ifdef-ed the non-asm-friendly portion of as-layout.h. With this in place, most of the rest of this patch is changing CONFIG_STUB_* to STUB_*, except in stub.S, where they are changed to ASM_STUB_*. defconfig has the old symbols deleted. I also print these addresses out in case there is any problem mapping them on the host. The two stub.S files had some trailing whitespace, so that is cleaned up here. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/um/Kconfig.i386 b/arch/um/Kconfig.i386 index d6cffb27fff..9876d80d85d 100644 --- a/arch/um/Kconfig.i386 +++ b/arch/um/Kconfig.i386 @@ -65,20 +65,6 @@ config 3_LEVEL_PGTABLES However, this it experimental on 32-bit architectures, so if unsure say N (on x86-64 it's automatically enabled, instead, as it's safe there). -config STUB_CODE - hex - default 0xbfffe000 if !HOST_VMSPLIT_2G - default 0x7fffe000 if HOST_VMSPLIT_2G - -config STUB_DATA - hex - default 0xbffff000 if !HOST_VMSPLIT_2G - default 0x7ffff000 if HOST_VMSPLIT_2G - -config STUB_START - hex - default STUB_CODE - config ARCH_HAS_SC_SIGNALS bool default y diff --git a/arch/um/Kconfig.x86_64 b/arch/um/Kconfig.x86_64 index f60e9e50642..d632e9a89cc 100644 --- a/arch/um/Kconfig.x86_64 +++ b/arch/um/Kconfig.x86_64 @@ -17,24 +17,12 @@ config SEMAPHORE_SLEEPERS config TOP_ADDR hex - default 0x80000000 + default 0x7fc0000000 config 3_LEVEL_PGTABLES bool default y -config STUB_CODE - hex - default 0x7fbfffe000 - -config STUB_DATA - hex - default 0x7fbffff000 - -config STUB_START - hex - default STUB_CODE - config ARCH_HAS_SC_SIGNALS bool default n diff --git a/arch/um/defconfig b/arch/um/defconfig index 1cbbe980f10..f609edede06 100644 --- a/arch/um/defconfig +++ b/arch/um/defconfig @@ -59,9 +59,6 @@ CONFIG_SEMAPHORE_SLEEPERS=y # CONFIG_HOST_2G_2G is not set CONFIG_TOP_ADDR=0xc0000000 # CONFIG_3_LEVEL_PGTABLES is not set -CONFIG_STUB_CODE=0xbfffe000 -CONFIG_STUB_DATA=0xbffff000 -CONFIG_STUB_START=0xbfffe000 CONFIG_ARCH_HAS_SC_SIGNALS=y CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA=y CONFIG_GENERIC_HWEIGHT=y diff --git a/arch/um/include/as-layout.h b/arch/um/include/as-layout.h index 2f16a1c7d61..a5cdf953e04 100644 --- a/arch/um/include/as-layout.h +++ b/arch/um/include/as-layout.h @@ -6,6 +6,28 @@ #ifndef __START_H__ #define __START_H__ +#include "uml-config.h" +#include "kern_constants.h" + +/* + * Assembly doesn't want any casting, but C does, so define these + * without casts here, and define new symbols with casts inside the C + * section. + */ +#define ASM_STUB_CODE (UML_CONFIG_TOP_ADDR - 2 * UM_KERN_PAGE_SIZE) +#define ASM_STUB_DATA (UML_CONFIG_TOP_ADDR - UM_KERN_PAGE_SIZE) +#define ASM_STUB_START ASM_STUB_CODE + +/* + * This file is included by the assembly stubs, which just want the + * definitions above. + */ +#ifndef __ASSEMBLY__ + +#define STUB_CODE ((unsigned long) ASM_STUB_CODE) +#define STUB_DATA ((unsigned long) ASM_STUB_DATA) +#define STUB_START ((unsigned long) ASM_STUB_START) + #include "sysdep/ptrace.h" struct cpu_task { @@ -32,3 +54,5 @@ extern int linux_main(int argc, char **argv); extern void (*sig_info[])(int, struct uml_pt_regs *); #endif + +#endif diff --git a/arch/um/include/sysdep-i386/stub.h b/arch/um/include/sysdep-i386/stub.h index 19c85f330fc..8c097b87fca 100644 --- a/arch/um/include/sysdep-i386/stub.h +++ b/arch/um/include/sysdep-i386/stub.h @@ -9,6 +9,7 @@ #include #include #include +#include "as-layout.h" #include "stub-data.h" #include "kern_constants.h" #include "uml-config.h" @@ -89,12 +90,12 @@ static inline void remap_stack(int fd, unsigned long offset) { __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;" "movl %7, %%ebx ; movl %%eax, (%%ebx)" - : : "g" (STUB_MMAP_NR), "b" (UML_CONFIG_STUB_DATA), - "c" (UM_KERN_PAGE_SIZE), + : : "g" (STUB_MMAP_NR), "b" (STUB_DATA), + "c" (UM_KERN_PAGE_SIZE), "d" (PROT_READ | PROT_WRITE), - "S" (MAP_FIXED | MAP_SHARED), "D" (fd), - "a" (offset), - "i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err) + "S" (MAP_FIXED | MAP_SHARED), "D" (fd), + "a" (offset), + "i" (&((struct stub_data *) STUB_DATA)->err) : "memory"); } diff --git a/arch/um/include/sysdep-x86_64/stub.h b/arch/um/include/sysdep-x86_64/stub.h index 92e989f8176..655f9c2de3a 100644 --- a/arch/um/include/sysdep-x86_64/stub.h +++ b/arch/um/include/sysdep-x86_64/stub.h @@ -9,6 +9,7 @@ #include #include #include +#include "as-layout.h" #include "stub-data.h" #include "kern_constants.h" #include "uml-config.h" @@ -94,13 +95,13 @@ static inline void remap_stack(long fd, unsigned long offset) { __asm__ volatile ("movq %4,%%r10 ; movq %5,%%r8 ; " "movq %6, %%r9; " __syscall "; movq %7, %%rbx ; " - "movq %%rax, (%%rbx)": - : "a" (STUB_MMAP_NR), "D" (UML_CONFIG_STUB_DATA), - "S" (UM_KERN_PAGE_SIZE), - "d" (PROT_READ | PROT_WRITE), - "g" (MAP_FIXED | MAP_SHARED), "g" (fd), + "movq %%rax, (%%rbx)": + : "a" (STUB_MMAP_NR), "D" (STUB_DATA), + "S" (UM_KERN_PAGE_SIZE), + "d" (PROT_READ | PROT_WRITE), + "g" (MAP_FIXED | MAP_SHARED), "g" (fd), "g" (offset), - "i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err) + "i" (&((struct stub_data *) STUB_DATA)->err) : __syscall_clobber, "r10", "r8", "r9" ); } diff --git a/arch/um/kernel/exec.c b/arch/um/kernel/exec.c index 7c77adecd91..8196450451c 100644 --- a/arch/um/kernel/exec.c +++ b/arch/um/kernel/exec.c @@ -11,6 +11,7 @@ #include "asm/current.h" #include "asm/processor.h" #include "asm/uaccess.h" +#include "as-layout.h" #include "mem_user.h" #include "skas.h" #include "os.h" @@ -18,7 +19,7 @@ void flush_thread(void) { void *data = NULL; - unsigned long end = proc_mm ? task_size : CONFIG_STUB_START; + unsigned long end = proc_mm ? task_size : STUB_START; int ret; arch_flush_thread(¤t->thread.arch); diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c index 47b812b3bca..d119f4f7d89 100644 --- a/arch/um/kernel/skas/clone.c +++ b/arch/um/kernel/skas/clone.c @@ -4,6 +4,7 @@ #include #include #include +#include "as-layout.h" #include "ptrace_user.h" #include "skas.h" #include "stub-data.h" @@ -21,12 +22,11 @@ void __attribute__ ((__section__ (".__syscall_stub"))) stub_clone_handler(void) { - struct stub_data *data = (struct stub_data *) UML_CONFIG_STUB_DATA; + struct stub_data *data = (struct stub_data *) STUB_DATA; long err; err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD, - UML_CONFIG_STUB_DATA + UM_KERN_PAGE_SIZE / 2 - - sizeof(void *)); + STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *)); if(err != 0) goto out; diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c index ae79888cf52..f859ec306cd 100644 --- a/arch/um/kernel/skas/mmu.c +++ b/arch/um/kernel/skas/mmu.c @@ -7,6 +7,7 @@ #include "linux/sched.h" #include "asm/pgalloc.h" #include "asm/pgtable.h" +#include "as-layout.h" #include "os.h" #include "skas.h" @@ -83,12 +84,12 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm) */ mm->pgd[USER_PTRS_PER_PGD] = __pgd(0); - ret = init_stub_pte(mm, CONFIG_STUB_CODE, + ret = init_stub_pte(mm, STUB_CODE, (unsigned long) &__syscall_stub_start); if (ret) goto out_free; - ret = init_stub_pte(mm, CONFIG_STUB_DATA, stack); + ret = init_stub_pte(mm, STUB_DATA, stack); if (ret) goto out_free; diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c index 0297e63f972..fce389c2342 100644 --- a/arch/um/kernel/skas/process.c +++ b/arch/um/kernel/skas/process.c @@ -18,7 +18,7 @@ int new_mm(unsigned long stack) return fd; if (skas_needs_stub) - map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack); + map_stub_pages(fd, STUB_CODE, STUB_DATA, stack); return fd; } diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c index 942f20ea888..f4a0e407eee 100644 --- a/arch/um/kernel/tlb.c +++ b/arch/um/kernel/tlb.c @@ -485,8 +485,8 @@ void __flush_tlb_one(unsigned long addr) 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; + if (!proc_mm && (end_addr > STUB_START)) + end_addr = STUB_START; fix_range_common(mm, start_addr, end_addr, force); } @@ -510,7 +510,7 @@ void flush_tlb_mm(struct mm_struct *mm) if (atomic_read(&mm->mm_users) == 0) return; - end = proc_mm ? task_size : CONFIG_STUB_START; + end = proc_mm ? task_size : STUB_START; fix_range(mm, 0, end, 0); } diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c index 1993e5e1225..f1c71393f57 100644 --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -242,7 +242,8 @@ static unsigned long set_task_sizes_skas(unsigned long *task_size_out) if (!skas_needs_stub) *task_size_out = host_task_size; - else *task_size_out = CONFIG_STUB_START & PGDIR_MASK; + else + *task_size_out = STUB_START & PGDIR_MASK; return host_task_size; } diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c index d58d11179bb..484e68f9f7a 100644 --- a/arch/um/os-Linux/skas/mem.c +++ b/arch/um/os-Linux/skas/mem.c @@ -10,6 +10,7 @@ #include #include "init.h" #include "kern_constants.h" +#include "as-layout.h" #include "mm_id.h" #include "os.h" #include "proc_mm.h" @@ -40,7 +41,7 @@ static unsigned long syscall_regs[MAX_REG_NR]; static int __init init_syscall_regs(void) { get_safe_registers(syscall_regs); - syscall_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + + syscall_regs[REGS_IP_INDEX] = STUB_CODE + ((unsigned long) &batch_syscall_stub - (unsigned long) &__syscall_stub_start); return 0; @@ -93,8 +94,7 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr) ret = *((unsigned long *) mm_idp->stack); offset = *((unsigned long *) mm_idp->stack + 1); if (offset) { - data = (unsigned long *)(mm_idp->stack + - offset - UML_CONFIG_STUB_DATA); + data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA); printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, " "data = %p\n", ret, offset, data); syscall = (unsigned long *)((unsigned long)data + data[0]); @@ -182,7 +182,7 @@ long syscall_stub_data(struct mm_id * mm_idp, memcpy(stack + 1, data, data_count * sizeof(long)); *stub_addr = (void *)(((unsigned long)(stack + 1) & - ~UM_KERN_PAGE_MASK) + UML_CONFIG_STUB_DATA); + ~UM_KERN_PAGE_MASK) + STUB_DATA); return 0; } diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 8548f126d62..e60d6e6c5a5 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -191,22 +191,23 @@ static int userspace_tramp(void *stack) int fd; unsigned long long offset; fd = phys_mapping(to_phys(&__syscall_stub_start), &offset); - addr = mmap64((void *) UML_CONFIG_STUB_CODE, UM_KERN_PAGE_SIZE, + addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE, PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset); if (addr == MAP_FAILED) { - printk(UM_KERN_ERR "mapping mmap stub failed, " - "errno = %d\n", errno); + printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, " + "errno = %d\n", STUB_CODE, errno); exit(1); } if (stack != NULL) { fd = phys_mapping(to_phys(stack), &offset); - addr = mmap((void *) UML_CONFIG_STUB_DATA, + addr = mmap((void *) STUB_DATA, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, fd, offset); if (addr == MAP_FAILED) { printk(UM_KERN_ERR "mapping segfault stack " - "failed, errno = %d\n", errno); + "at 0x%lx failed, errno = %d\n", + STUB_DATA, errno); exit(1); } } @@ -214,11 +215,11 @@ static int userspace_tramp(void *stack) if (!ptrace_faultinfo && (stack != NULL)) { struct sigaction sa; - unsigned long v = UML_CONFIG_STUB_CODE + + unsigned long v = STUB_CODE + (unsigned long) stub_segv_handler - (unsigned long) &__syscall_stub_start; - set_sigstack((void *) UML_CONFIG_STUB_DATA, UM_KERN_PAGE_SIZE); + set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE); sigemptyset(&sa.sa_mask); sigaddset(&sa.sa_mask, SIGIO); sigaddset(&sa.sa_mask, SIGWINCH); @@ -382,10 +383,10 @@ static int __init init_thread_regs(void) { get_safe_registers(thread_regs); /* Set parent's instruction pointer to start of clone-stub */ - thread_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE + + thread_regs[REGS_IP_INDEX] = STUB_CODE + (unsigned long) stub_clone_handler - (unsigned long) &__syscall_stub_start; - thread_regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + UM_KERN_PAGE_SIZE - + thread_regs[REGS_SP_INDEX] = STUB_DATA + UM_KERN_PAGE_SIZE - sizeof(void *); #ifdef __SIGNAL_FRAMESIZE thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE; @@ -443,7 +444,7 @@ int copy_context_skas0(unsigned long new_stack, int pid) * child's stack and check it. */ wait_stub_done(pid); - if (child_data->err != UML_CONFIG_STUB_DATA) + if (child_data->err != STUB_DATA) panic("copy_context_skas0 - stub-child reports error %ld\n", child_data->err); diff --git a/arch/um/sys-i386/stub.S b/arch/um/sys-i386/stub.S index 6a70d9ab5c2..e730772c401 100644 --- a/arch/um/sys-i386/stub.S +++ b/arch/um/sys-i386/stub.S @@ -1,4 +1,5 @@ #include "uml-config.h" +#include "as-layout.h" .globl syscall_stub .section .__syscall_stub, "x" @@ -6,7 +7,7 @@ .globl batch_syscall_stub batch_syscall_stub: /* load pointer to first operation */ - mov $(UML_CONFIG_STUB_DATA+8), %esp + mov $(ASM_STUB_DATA+8), %esp again: /* load length of additional data */ @@ -14,12 +15,12 @@ again: /* if(length == 0) : end of list */ /* write possible 0 to header */ - mov %eax, UML_CONFIG_STUB_DATA+4 + mov %eax, ASM_STUB_DATA+4 cmpl $0, %eax jz done /* save current pointer */ - mov %esp, UML_CONFIG_STUB_DATA+4 + mov %esp, ASM_STUB_DATA+4 /* skip additional data */ add %eax, %esp @@ -45,7 +46,7 @@ again: done: /* save return value */ - mov %eax, UML_CONFIG_STUB_DATA + mov %eax, ASM_STUB_DATA /* stop */ int3 diff --git a/arch/um/sys-i386/stub_segv.c b/arch/um/sys-i386/stub_segv.c index 2355dc19c46..b3999cb76bf 100644 --- a/arch/um/sys-i386/stub_segv.c +++ b/arch/um/sys-i386/stub_segv.c @@ -6,6 +6,7 @@ #include #include /* The only way I can see to get sigset_t */ #include +#include "as-layout.h" #include "uml-config.h" #include "sysdep/stub.h" #include "sysdep/sigcontext.h" @@ -17,8 +18,7 @@ stub_segv_handler(int sig) struct sigcontext *sc = (struct sigcontext *) (&sig + 1); int pid; - GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA), - sc); + GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA), sc); pid = stub_syscall0(__NR_getpid); stub_syscall2(__NR_kill, pid, SIGUSR1); diff --git a/arch/um/sys-x86_64/stub.S b/arch/um/sys-x86_64/stub.S index 03c27973578..4afe204a6af 100644 --- a/arch/um/sys-x86_64/stub.S +++ b/arch/um/sys-x86_64/stub.S @@ -1,4 +1,5 @@ #include "uml-config.h" +#include "as-layout.h" .globl syscall_stub .section .__syscall_stub, "x" @@ -7,18 +8,18 @@ syscall_stub: /* We don't have 64-bit constants, so this constructs the address * we need. */ - movq $(UML_CONFIG_STUB_DATA >> 32), %rbx + movq $(ASM_STUB_DATA >> 32), %rbx salq $32, %rbx - movq $(UML_CONFIG_STUB_DATA & 0xffffffff), %rcx + movq $(ASM_STUB_DATA & 0xffffffff), %rcx or %rcx, %rbx movq %rax, (%rbx) int3 .globl batch_syscall_stub batch_syscall_stub: - mov $(UML_CONFIG_STUB_DATA >> 32), %rbx + mov $(ASM_STUB_DATA >> 32), %rbx sal $32, %rbx - mov $(UML_CONFIG_STUB_DATA & 0xffffffff), %rax + mov $(ASM_STUB_DATA & 0xffffffff), %rax or %rax, %rbx /* load pointer to first operation */ mov %rbx, %rsp diff --git a/arch/um/sys-x86_64/stub_segv.c b/arch/um/sys-x86_64/stub_segv.c index 652fa34c2cd..3afb590f007 100644 --- a/arch/um/sys-x86_64/stub_segv.c +++ b/arch/um/sys-x86_64/stub_segv.c @@ -6,6 +6,7 @@ #include #include #include +#include "as-layout.h" #include "uml-config.h" #include "sysdep/sigcontext.h" #include "sysdep/faultinfo.h" @@ -33,7 +34,7 @@ stub_segv_handler(int sig) int pid; __asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :); - GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA), + GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA), &uc->uc_mcontext); pid = stub_syscall0(__NR_getpid);