2 * This is the IBM/Motorola/Apple/whoever Linux incarnation of
3 * arch-dependent OS-dependent routines. See also "linux-os.c". */
6 * This software is part of the SBCL system. See the README file for
9 * This software is derived from the CMU CL system, which was
10 * written at Carnegie Mellon University and released into the
11 * public domain. The software is in the public domain and is
12 * provided with absolutely no warranty. See the COPYING and CREDITS
13 * files for more information.
16 /* These header files were lifted wholesale from linux-os.c, some may
17 * be redundant. -- Dan Barlow ca. 2001-05-01 */
19 #include <sys/param.h>
25 #include "interrupt.h"
29 #include <sys/socket.h>
30 #include <sys/utsname.h>
32 #include <sys/types.h>
39 size_t os_vm_page_size;
41 struct thread *arch_os_get_current_thread() {
44 int arch_os_thread_init(struct thread *thread) {
45 return 1; /* success */
47 int arch_os_thread_cleanup(struct thread *thread) {
48 return 1; /* success */
51 os_context_register_t *
52 os_context_register_addr(os_context_t *context, int offset)
54 return &((context->uc_mcontext.regs)->gpr[offset]);
57 os_context_register_t *
58 os_context_pc_addr(os_context_t *context)
60 return &((context->uc_mcontext.regs)->nip);
63 os_context_register_t *
64 os_context_lr_addr(os_context_t *context)
66 return &((context->uc_mcontext.regs)->link);
70 os_context_sigmask_addr(os_context_t *context)
72 return &context->uc_sigmask;
76 os_context_fp_control(os_context_t *context)
78 /* So this may look like nice, well behaved code. However, closer
79 inspection reveals that gpr is simply the general purpose
80 registers, and PT_FPSCR is an offset that is larger than 32
81 (the number of ppc registers), but that happens to get the
82 right answer. -- CSR, 2002-07-11 */
83 return context->uc_mcontext.regs->gpr[PT_FPSCR];
87 os_restore_fp_control(os_context_t *context)
89 unsigned long control;
92 control = os_context_fp_control(context) &
93 /* FIXME: Should we preserve the user's requested rounding mode?
97 ~(FLOAT_STICKY_BITS_MASK | FLOAT_EXCEPTIONS_BYTE_MASK)
99 here leads to infinite SIGFPE for invalid operations, as
100 there are bits in the control register that need to be
101 cleared that are let through by that mask. -- CSR, 2002-07-16 */
103 FLOAT_TRAPS_BYTE_MASK;
105 d = *((double *) &control);
106 /* Hmp. Apparently the following doesn't work either:
108 asm volatile ("mtfsf 0xff,%0" : : "f" (d));
110 causing segfaults at the first GC.
115 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
118 ppc_flush_icache(address,length);