0.7.4.17: Mostly Alpha fixes

[sbcl.git] / src / runtime / linux-os.c

diff --git a/src/runtime/linux-os.c b/src/runtime/linux-os.c
index 376b085..d44f19f 100644 (file)
--- a/src/runtime/linux-os.c
+++ b/src/runtime/linux-os.c
@@ -48,6 +48,10 @@ size_t os_vm_page_size;
 #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
@@ -55,17 +59,29 @@ void os_init(void)
     {
         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();
-   /* this could just as well be in arch_init, but it's not  */
-#ifdef i386
+   /* This could just as well be in arch_init(), but it's not. */
+#ifdef __i386__
     SET_FPU_CONTROL_WORD(0x1372|4|8|16|32); /* no interrupts */
 #endif
 }
@@ -84,15 +100,15 @@ int n_do_mmap_ignorable_errors = 3;
 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));
@@ -182,7 +198,7 @@ os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
                MAP_PRIVATE | MAP_FILE | MAP_FIXED,
                fd, (off_t) offset);
 
-    if(addr == MAP_FAILED) {
+    if (addr == MAP_FAILED) {
        perror("mmap");
        lose("unexpected mmap(..) failure");
     }
@@ -234,7 +250,7 @@ is_valid_lisp_addr(os_vm_address_t addr)
 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);
@@ -246,37 +262,42 @@ sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 static 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);
     os_vm_address_t addr;
 
-#ifdef i386
+#ifdef __i386__
     interrupt_handle_now(signal,contextstruct);
 #else
-#define CONTROL_STACK_TOP (((char*)CONTROL_STACK_START)+CONTROL_STACK_SIZE)
+    char *control_stack_top = (char*)CONTROL_STACK_START + CONTROL_STACK_SIZE;
     
     addr = arch_get_bad_addr(signal,info,context);
 
-    if(addr != NULL && 
+    if (addr != NULL && 
        *os_context_register_addr(context,reg_ALLOC) & (1L<<63)){
+       
        /* 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
+        * 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 (addr > CONTROL_STACK_TOP && addr < BINDING_STACK_START) {
-       fprintf(stderr, "Possible stack overflow at 0x%016lX: CONTROL_STACK_TOP=%lx, BINDING_STACK_START=%lx\n",addr, CONTROL_STACK_TOP,BINDING_STACK_START);
-       /* try to fix control frame pointer */
+    } else if (addr > control_stack_top && addr < BINDING_STACK_START) {
+       fprintf(stderr,
+               "Possible stack overflow at 0x%016lX:\n"
+               "control_stack_top=%lx, BINDING_STACK_START=%lx\n",
+               addr,
+               control_stack_top,
+               BINDING_STACK_START);
+       /* Try to fix control frame pointer. */
        while ( ! (CONTROL_STACK_START <= *current_control_frame_pointer &&
-                  *current_control_frame_pointer <= CONTROL_STACK_TOP))
+                  *current_control_frame_pointer <= control_stack_top))
            ((char*)current_control_frame_pointer) -= sizeof(lispobj);
-       ldb_monitor();
+       monitor_or_something();
     } else if (!interrupt_maybe_gc(signal, info, context)) {
        interrupt_handle_now(signal, info, context);
     }
@@ -284,11 +305,9 @@ sigsegv_handler(int signal, siginfo_t *info, void* void_context)
 }
 #endif
 
-
-
 void
 os_install_interrupt_handlers(void)
 {
-    interrupt_install_low_level_handler(SIGSEGV, sigsegv_handler);
+    undoably_install_low_level_interrupt_handler(SIGSEGV, sigsegv_handler);
 }