/*
- * the Linux incarnation of OS-dependent routines
+ * the Linux incarnation of OS-dependent routines. See also
+ * $(sbcl_arch)-linux-os.c
*
* This file (along with os.h) exports an OS-independent interface to
* the operating system VM facilities. Surprise surprise, this
* files for more information.
*/
-/*
- * $Header$
- */
-
#include <stdio.h>
#include <sys/param.h>
#include <sys/file.h>
#include "arch.h"
#include "globals.h"
#include "interrupt.h"
+#include "interr.h"
#include "lispregs.h"
#include "sbcl.h"
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
-#include "x86-validate.h"
+#include "validate.h"
size_t os_vm_page_size;
#if defined GENCGC
#include "gencgc.h"
#endif
\f
+
+#ifdef sparc
+int early_kernel = 0;
+#endif
void os_init(void)
{
/* Early versions of Linux don't support the mmap(..) functionality
{
struct utsname name;
int major_version;
+#ifdef sparc
+ int minor_version;
+#endif
uname(&name);
major_version = atoi(name.release);
if (major_version < 2) {
lose("linux major version=%d (can't run in version < 2.0.0)",
major_version);
}
+#ifdef sparc
+ /* KLUDGE: This will break if Linux moves to a uname() version number
+ * that has more than one digit initially -- CSR, 2002-02-12 */
+ minor_version = atoi(name.release+2);
+ if (minor_version < 4) {
+ FSHOW((stderr,"linux minor version=%d;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", minor_version));
+ early_kernel = 1;
+ }
+#endif
}
os_vm_page_size = getpagesize();
-
- SET_FPU_CONTROL_WORD(0x1372|4|8|16|32); /* no interrupts */
-}
-
-/* KLUDGE: As of kernel 2.2.14 on Red Hat 6.2, there's code in the
- * <sys/ucontext.h> file to define symbolic names for offsets into
- * gregs[], but it's conditional on __USE_GNU and not defined, so
- * we need to do this nasty absolute index magic number thing
- * instead. */
-int *
-os_context_register_addr(os_context_t *context, int offset)
-{
- switch(offset) {
- case 0: return &context->uc_mcontext.gregs[11]; /* EAX */
- case 2: return &context->uc_mcontext.gregs[10]; /* ECX */
- case 4: return &context->uc_mcontext.gregs[9]; /* EDX */
- case 6: return &context->uc_mcontext.gregs[8]; /* EBX */
- case 8: return &context->uc_mcontext.gregs[7]; /* ESP */
- case 10: return &context->uc_mcontext.gregs[6]; /* EBP */
- case 12: return &context->uc_mcontext.gregs[5]; /* ESI */
- case 14: return &context->uc_mcontext.gregs[4]; /* EDI */
- default: return 0;
- }
-}
-int *
-os_context_pc_addr(os_context_t *context)
-{
- return &context->uc_mcontext.gregs[14];
-}
-int *
-os_context_sp_addr(os_context_t *context)
-{
- return &context->uc_mcontext.gregs[17];
-}
-
-sigset_t *
-os_context_sigmask_addr(os_context_t *context)
-{
- return &context->uc_sigmask;
+ /* This could just as well be in arch_init(), but it's not. */
+#ifdef __i386__
+ /* FIXME: This used to be here. However, I have just removed it
+ with no apparent ill effects (it may be that earlier kernels
+ started up a process with a different set of traps, or
+ something?) Find out what this was meant to do, and reenable it
+ or delete it if possible. -- CSR, 2002-07-15 */
+ /* SET_FPU_CONTROL_WORD(0x1372|4|8|16|32); no interrupts */
+#endif
}
/* In Debian CMU CL ca. 2.4.9, it was possible to get an infinite
static int
do_mmap(os_vm_address_t *addr, os_vm_size_t len, int flags)
{
- /* We *must* have the memory where we want it. */
- os_vm_address_t old_addr=*addr;
+ /* We *must* have the memory where we expect it. */
+ os_vm_address_t old_addr = *addr;
*addr = mmap(*addr, len, OS_VM_PROT_ALL, flags, -1, 0);
if (*addr == MAP_FAILED ||
((old_addr != NULL) && (*addr != old_addr))) {
FSHOW((stderr,
- "error in allocating memory from the OS\n"
- "(addr=%lx, len=%lx, flags=%lx)\n",
+ "/retryable error in allocating memory from the OS\n"
+ "(addr=0x%lx, len=0x%lx, flags=0x%lx)\n",
(long) addr,
(long) len,
(long) flags));
MAP_PRIVATE | MAP_FILE | MAP_FIXED,
fd, (off_t) offset);
- if(addr == MAP_FAILED) {
+ if (addr == MAP_FAILED) {
perror("mmap");
lose("unexpected mmap(..) failure");
}
}
void
-os_flush_icache(os_vm_address_t address, os_vm_size_t length)
-{
-}
-
-void
os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
{
if (mprotect(address, length, prot) == -1) {
static boolean
in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
{
- char* beg = (char*)sbeg;
- char* end = (char*)sbeg + slen;
+ char* beg = (char*)((long)sbeg);
+ char* end = (char*)((long)sbeg) + slen;
char* adr = (char*)a;
return (adr >= beg && adr < end);
}
* any OS-dependent special low-level handling for signals
*/
-#if !defined GENCGC
-
-void
-os_install_interrupt_handlers(void)
-{}
-#else
+#if defined GENCGC
/*
* The GENCGC needs to be hooked into whatever signal is raised for
void
sigsegv_handler(int signal, siginfo_t *info, void* void_context)
{
- os_context_t *context = (os_context_t*)void_context;
+ os_context_t *context = arch_os_get_context(&void_context);
void* fault_addr = (void*)context->uc_mcontext.cr2;
- if (!gencgc_handle_wp_violation(fault_addr)) {
- interrupt_handle_now(signal, info, void_context);
+ if (!gencgc_handle_wp_violation(fault_addr))
+ if(!handle_control_stack_guard_triggered(context,fault_addr))
+ interrupt_handle_now(signal, info, void_context);
+}
+
+#else
+
+static void
+sigsegv_handler(int signal, siginfo_t *info, void* void_context)
+{
+ os_context_t *context = arch_os_get_context(&void_context);
+ os_vm_address_t addr;
+
+ addr = arch_get_bad_addr(signal,info,context);
+ if (addr != NULL &&
+ *os_context_register_addr(context,reg_ALLOC) & (1L<<63)){
+
+ /* Alpha stuff: This is the end of a pseudo-atomic section
+ * during which a signal was received. We must deal with the
+ * pending interrupt (see also interrupt.c,
+ * ../code/interrupt.lisp)
+ */
+ /* (how we got here: when interrupting, we set bit 63 in
+ * reg_Alloc. At the end of the atomic section we tried to
+ * write to reg_ALLOC, got a SIGSEGV (there's nothing mapped
+ * there) so ended up here
+ */
+ *os_context_register_addr(context,reg_ALLOC) -= (1L<<63);
+ interrupt_handle_pending(context);
+ } else {
+ if(!interrupt_maybe_gc(signal, info, context))
+ if(!handle_control_stack_guard_triggered(context,addr))
+ interrupt_handle_now(signal, info, context);
}
}
+#endif
+
void
os_install_interrupt_handlers(void)
{
- interrupt_install_low_level_handler(SIGSEGV, sigsegv_handler);
+ undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
+ sigsegv_handler);
}
-#endif
projects / sbcl.git / blobdiff