diff options
| -rw-r--r-- | ChangeLog | 13 | ||||
| -rw-r--r-- | NEWS | 4 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/Dist | 1 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/bits/sigcontext.h | 76 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/exc2signal.c | 74 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/init-first.c | 333 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/intr-msg.h | 99 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/longjmp-ts.c | 56 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/register-dump.h | 120 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/sigreturn.c | 186 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/static-start.S | 59 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/powerpc/trampoline.c | 256 |
12 files changed, 1276 insertions, 1 deletions
@@ -1,5 +1,18 @@ 2001-11-09 Roland McGrath <roland@frob.com> + Hurd/PowerPC port contributed by Peter Bruin <pjbruin@dds.nl>. + * NEWS: Mention it. + * sysdeps/mach/hurd/powerpc/exc2signal.c: New file. + * sysdeps/mach/hurd/powerpc/init-first.c: New file. + * sysdeps/mach/hurd/powerpc/intr-msg.h: New file. + * sysdeps/mach/hurd/powerpc/longjmp-ts.c: New file. + * sysdeps/mach/hurd/powerpc/register-dump.h: New file. + * sysdeps/mach/hurd/powerpc/sigreturn.c: New file. + * sysdeps/mach/hurd/powerpc/static-start.S: New file. + * sysdeps/mach/hurd/powerpc/trampoline.c: New file. + * sysdeps/mach/hurd/powerpc/bits/sigcontext.h: New file. + * sysdeps/mach/hurd/powerpc/Dist: New file. + * hurd/privports.c (__get_privileged_ports): Only contact the proc server if necessary for this call. Suggested by Neal H Walfield <neal@cs.uml.edu>. @@ -16,12 +16,14 @@ Version 2.2.5 * Andreas Jaeger contributed a port to x86_64/Linux. +* Peter Bruin contributed a port to PowerPC/Hurd. + * libc functions using I/O streams now can handle wide-oriented streams as well. * optimizations in the dynamic linker. binaries created by recent binutils versions start up quicker due to reduced time spend on relocations. - + Version 2.2.4 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh, diff --git a/sysdeps/mach/hurd/powerpc/Dist b/sysdeps/mach/hurd/powerpc/Dist new file mode 100644 index 0000000..c581802 --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/Dist @@ -0,0 +1 @@ +static-start.S diff --git a/sysdeps/mach/hurd/powerpc/bits/sigcontext.h b/sysdeps/mach/hurd/powerpc/bits/sigcontext.h new file mode 100644 index 0000000..6f14ec5 --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/bits/sigcontext.h @@ -0,0 +1,76 @@ +/* Machine-dependent signal context structure for GNU Hurd. PowerPC version. + Copyright (C) 1991, 1992, 1994, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _SIGNAL_H +# error "Never use <bits/sigcontext.h> directly; include <signal.h> instead." +#endif + +/* Signal handlers are actually called: + void handler (int sig, int code, struct sigcontext *scp); */ + +/* State of this thread when the signal was taken. */ +struct sigcontext + { + /* These first members are machine-independent. */ + + int sc_onstack; /* Nonzero if running on sigstack. */ + __sigset_t sc_mask; /* Blocked signals to restore. */ + + /* MiG reply port this thread is using. */ + unsigned int sc_reply_port; + + /* Port this thread is doing an interruptible RPC on. */ + unsigned int sc_intr_port; + + /* Error code associated with this signal (interpreted as `error_t'). */ + int sc_error; + + /* All following members are machine-dependent. The rest of this + structure is written to be laid out identically to: + { + struct ppc_thread_state basic; + struct ppc_exc_state exc; + struct ppc_float_state fpu; + } + trampoline.c knows this, so it must be changed if this changes. */ + +#define sc_ppc_thread_state sc_srr0 /* Beginning of correspondence. */ +#define sc_pc sc_srr0 /* For sysdeps/generic/profil-counter.h. */ + unsigned int sc_srr0; + unsigned int sc_srr1; + unsigned int sc_gprs[32]; + unsigned int sc_cr; + unsigned int sc_xer; + unsigned int sc_lr; + unsigned int sc_ctr; + unsigned int sc_mq; + unsigned int sc_ts_pad; + +#define sc_ppc_exc_state sc_dar + unsigned int sc_dar; + unsigned int sc_dsisr; + unsigned int sc_exception; + unsigned int sc_es_pad0; + unsigned int sc_es_pad1[4]; + +#define sc_ppc_float_state sc_fprs[0] + double sc_fprs[32]; + unsigned int sc_fpscr_pad; + unsigned int sc_fpscr; + }; diff --git a/sysdeps/mach/hurd/powerpc/exc2signal.c b/sysdeps/mach/hurd/powerpc/exc2signal.c new file mode 100644 index 0000000..7cea85d --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/exc2signal.c @@ -0,0 +1,74 @@ +/* Translate Mach exception codes into signal numbers. PowerPC version. + Copyright (C) 1991,92,94,96,97,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <hurd.h> +#include <hurd/signal.h> +#include <mach/exception.h> + +/* Translate the Mach exception codes, as received in an `exception_raise' RPC, + into a signal number and signal subcode. */ + +void +_hurd_exception2signal (struct hurd_signal_detail *detail, int *signo) +{ + detail->error = 0; + + switch (detail->exc) + { + default: + *signo = SIGIOT; + detail->code = detail->exc; + break; + + case EXC_BAD_ACCESS: + if (detail->exc_code == KERN_PROTECTION_FAILURE) + *signo = SIGSEGV; + else + *signo = SIGBUS; + detail->code = detail->exc_subcode; + detail->error = detail->exc_code; + break; + + /* XXX there has got to be something more here */ + + case EXC_BAD_INSTRUCTION: + *signo = SIGILL; + detail->code = 0; + break; + + case EXC_ARITHMETIC: + *signo = SIGFPE; + detail->code = 0; + break; + + case EXC_EMULATION: + *signo = SIGEMT; + detail->code = 0; + break; + + case EXC_SOFTWARE: + *signo = SIGEMT; + detail->code = 0; + break; + + case EXC_BREAKPOINT: + *signo = SIGTRAP; + detail->code = 0; + } +} diff --git a/sysdeps/mach/hurd/powerpc/init-first.c b/sysdeps/mach/hurd/powerpc/init-first.c new file mode 100644 index 0000000..25f5c53 --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/init-first.c @@ -0,0 +1,333 @@ +/* Initialization code run first thing by the ELF startup code. PowerPC/Hurd. + Copyright (C) 1995,96,97,98,99,2000,01 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <assert.h> +#include <hurd.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <sysdep.h> +#include <set-hooks.h> +#include "hurdstartup.h" +#include "hurdmalloc.h" /* XXX */ + +extern void __mach_init (void); +extern void __libc_init (int, char **, char **); +#ifdef USE_NONOPTION_FLAGS +extern void __getopt_clean_environment (char **); +#endif +extern void __libc_global_ctors (void); + +unsigned int __hurd_threadvar_max; +unsigned long int __hurd_threadvar_stack_offset; +unsigned long int __hurd_threadvar_stack_mask; + +#ifndef SHARED +int __libc_enable_secure; +#endif +int __libc_multiple_libcs = 1; + +extern int __libc_argc; +extern char **__libc_argv; +extern char **_dl_argv; + +void *(*_cthread_init_routine) (void); /* Returns new SP to use. */ +void (*_cthread_exit_routine) (int status) __attribute__ ((__noreturn__)); + +#ifndef SHARED +static unsigned int return_address; /* Make init1 return to _start. */ +#endif + +/* Things that want to be run before _hurd_init or much anything else. + Importantly, these are called before anything tries to use malloc. */ +DEFINE_HOOK (_hurd_preinit_hook, (void)); + + +/* We call this once the Hurd magic is all set up and we are ready to be a + Posixoid program. This does the same things the generic version does. */ +static void internal_function +posixland_init (int argc, char **argv, char **envp) +{ + asm ("li 3,0xbb; .long 0"); + __libc_argc = argc; + __libc_argv = argv; + __environ = envp; + + __libc_init (argc, argv, envp); + +#ifdef USE_NONOPTION_FLAGS + /* This is a hack to make the special getopt in GNU libc working. */ + __getopt_clean_environment (__environ); +#endif + +#ifdef SHARED + __libc_global_ctors (); +#endif +} + + +static void +init1 (int *data) +{ + int argc = *data; + char **argv = (char **) &data[1]; + char **envp = &argv[argc + 1]; + struct hurd_startup_data *d; + + while (*envp) + ++envp; + d = (void *) ++envp; + + /* If we are the bootstrap task started by the kernel, + then after the environment pointers there is no Hurd + data block; the argument strings start there. */ + /* OSF Mach starts the bootstrap task with argc == 0. + XXX This fails if a non-bootstrap task gets started + with argc == 0. */ + if (argc && (void *) d != argv[0]) + { + _hurd_init_dtable = d->dtable; + _hurd_init_dtablesize = d->dtablesize; + +#if 0 /* We can't free the old stack because it contains the argument strings. */ + { + /* Check if the stack we are now on is different from + the one described by _hurd_stack_{base,size}. */ + + char dummy; + const vm_address_t newsp = (vm_address_t) &dummy; + + if (d->stack_size != 0 && (newsp < d->stack_base || + newsp - d->stack_base > d->stack_size)) + /* The new stack pointer does not intersect with the + stack the exec server set up for us, so free that stack. */ + __vm_deallocate (__mach_task_self (), d->stack_base, d->stack_size); + } +#endif + } + + if (argc && (void *) d != argv[0] && (d->portarray || d->intarray)) + /* Initialize library data structures, start signal processing, etc. */ + _hurd_init (d->flags, argv, + d->portarray, d->portarraysize, + d->intarray, d->intarraysize); + +#ifndef SHARED + __libc_enable_secure = d->flags & EXEC_SECURE; +#endif +} + + +static inline void +init (int *data) +{ + int argc = *data; + char **argv = (void *) (data + 1); + char **envp = &argv[argc + 1]; + struct hurd_startup_data *d; + unsigned long int threadvars[_HURD_THREADVAR_MAX]; + + /* Provide temporary storage for thread-specific variables on the startup + stack so the cthreads initialization code can use them for malloc et al, + or so we can use malloc below for the real threadvars array. */ + memset (threadvars, 0, sizeof threadvars); + __hurd_threadvar_stack_offset = (unsigned long int) threadvars; + + while (*envp) + ++envp; + d = (void *) ++envp; + + /* The user might have defined a value for this, to get more variables. + Otherwise it will be zero on startup. We must make sure it is set + properly before before cthreads initialization, so cthreads can know + how much space to leave for thread variables. */ + if (__hurd_threadvar_max < _HURD_THREADVAR_MAX) + __hurd_threadvar_max = _HURD_THREADVAR_MAX; + + + /* After possibly switching stacks, call `init1' (above) with the user + code as the return address, and the argument data immediately above + that on the stack. */ + + if (_cthread_init_routine) + { + /* Initialize cthreads, which will allocate us a new stack to run on. */ + void *newsp = (*_cthread_init_routine) (); + struct hurd_startup_data *od; +#ifdef SHARED + void *oldsp; + unsigned int i, data_offset; +#endif + + /* Copy per-thread variables from that temporary + area onto the new cthread stack. */ + memcpy (__hurd_threadvar_location_from_sp (0, newsp), + threadvars, sizeof threadvars); + + /* Copy the argdata from the old stack to the new one. */ + newsp = memcpy (newsp - ((char *) &d[1] - (char *) data), data, + (char *) d - (char *) data); + +#ifdef SHARED + /* And readjust the dynamic linker's idea of where the argument + vector lives. */ + assert (_dl_argv == argv); + _dl_argv = (void *) ((int *) newsp + 1); +#endif + + /* Set up the Hurd startup data block immediately following + the argument and environment pointers on the new stack. */ + od = (newsp + ((char *) d - (char *) data)); + if (!argc || (void *) argv[0] == d) + /* We were started up by the kernel with arguments on the stack. + There is no Hurd startup data, so zero the block. */ + memset (od, 0, sizeof *od); + else + /* Copy the Hurd startup data block to the new stack. */ + *od = *d; + +#ifndef SHARED + asm ("mtlr %0; mr 1,%1; li 0,0; mr 3,%1; stwu 0,-16(1); b init1" + : : "r" (return_address), "r" (newsp)); + (void) init1; /* To avoid `defined but not used' warning. */ + /* NOTREACHED */ +#else + /* Copy the rest of the stack. Don't call a function to do that, + because that will alter the current stack. */ + asm ("mr %0,1" : "=r" (oldsp)); + data_offset = (unsigned int) data - (unsigned int) oldsp; + newsp -= data_offset; + for (i = 0; i < data_offset / 4; i++) + ((unsigned int *)newsp)[i] = ((unsigned int *)oldsp)[i]; + + /* Relocate stack frames. */ + { + unsigned int *oldframe0 = (unsigned int *)oldsp; + unsigned int *oldframe1 = *(unsigned int **)oldframe0; + unsigned int *oldframe2 = *(unsigned int **)oldframe1; + unsigned int *newframe0 = (unsigned int *)newsp; + unsigned int *newframe1 = newframe0 + (unsigned int)(oldframe1 - oldframe0); + unsigned int *newframe2 = newframe1 + (unsigned int)(oldframe2 - oldframe1); + *(unsigned int **)newframe0 = newframe1; + *(unsigned int **)newframe1 = newframe2; + } + + asm ("mr 1,%0; mr 31,%0" : : "r" (newsp)); /* XXX */ + init1 (newsp + data_offset); +#endif + } + else + { + /* We are not using cthreads, so we will have just a single allocated + area for the per-thread variables of the main user thread. */ + unsigned long int *array; + unsigned int i; + + array = malloc (__hurd_threadvar_max * sizeof (unsigned long int)); + if (array == NULL) + __libc_fatal ("Can't allocate single-threaded thread variables."); + + /* Copy per-thread variables from the temporary array into the + newly malloc'd space. */ + memcpy (array, threadvars, sizeof threadvars); + __hurd_threadvar_stack_offset = (unsigned long int) array; + for (i = _HURD_THREADVAR_MAX; i < __hurd_threadvar_max; ++i) + array[i] = 0; + +#ifndef SHARED + asm ("mr 3,%0; mtlr %1; addi 1,3,-16; b init1" + : : "r" (data), "r" (return_address)); + /* NOTREACHED */ +#else + init1 (data); +#endif + } +} + + +/* Do the first essential initializations that must precede all else. */ +static inline void +first_init (void) +{ + /* Initialize data structures so we can do RPCs. */ + __mach_init (); + + RUN_HOOK (_hurd_preinit_hook, ()); +} + +#ifdef SHARED +/* This function is called specially by the dynamic linker to do early + initialization of the shared C library before normal initializers + expecting a Posixoid environment can run. It gets called with the + stack set up just as the user will see it, so it can switch stacks. */ + +void +_dl_init_first (int argc, ...) +{ + asm ("li 3,0xaa; .long 0"); + first_init (); + + init (&argc); +} +#endif + + +#ifdef SHARED +/* The regular posixland initialization is what goes into libc's + normal initializer. */ +/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT + pointer in the dynamic section based solely on that. It is convention + for this function to be in the `.init' section, but the symbol name is + the only thing that really matters!! */ +strong_alias (posixland_init, _init); + + +void +__libc_init_first (int argc, char **argv, char **envp) +{ + /* Everything was done in the shared library initializer, _init. */ +} +#else +strong_alias (posixland_init, __libc_init_first); + + +void +_hurd_stack_setup (int *data) +{ + register unsigned int address; + asm ("mflr %0" : "=r" (address)); + return_address = address; + + first_init (); + + _hurd_startup ((void **) data, &init); +} +#endif + + +/* This function is defined here so that if this file ever gets into + ld.so we will get a link error. Having this file silently included + in ld.so causes disaster, because the _init definition above will + cause ld.so to gain an init function, which is not a cool thing. */ + +void +_dl_start (void) +{ + abort (); +} diff --git a/sysdeps/mach/hurd/powerpc/intr-msg.h b/sysdeps/mach/hurd/powerpc/intr-msg.h new file mode 100644 index 0000000..244d7e6 --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/intr-msg.h @@ -0,0 +1,99 @@ +/* Machine-dependent details of interruptible RPC messaging. PowerPC version. + Copyright (C) 1995,96,97,99,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify) \ +({ \ + error_t err; \ + asm (".globl _hurd_intr_rpc_msg_do_trap\n" \ + ".globl _hurd_intr_rpc_msg_in_trap\n" \ + " mr 3, %1\n" \ + " mr 4, %2\n" \ + " mr 5, %3\n" \ + " mr 6, %4\n" \ + " mr 7, %5\n" \ + " mr 8, %6\n" \ + " mr 9, %7\n" \ + " li 0, -25\n" \ + "_hurd_intr_rpc_msg_do_trap: sc\n" \ + "_hurd_intr_rpc_msg_in_trap: mr 3, %0\n" \ + : "=r" (err) \ + : "r" (msg), "r" (option), "r" (send_size), "r" (rcv_size), \ + "r" (rcv_name), "r" (timeout), "r" (notify) \ + : "0", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"); \ + err; \ +}) + +static void inline +INTR_MSG_BACK_OUT (struct ppc_thread_state *state) +{ + return; +} + +#include "hurdfault.h" + +/* This cannot be an inline function because it calls setjmp. */ +#define SYSCALL_EXAMINE(state, callno) \ +({ \ + u_int32_t *p = (void *) ((state)->srr0 - 4); \ + int result; \ + _hurdsig_catch_memory_fault (p) ? 0 : \ + ({ \ + if (result = (*p == 0x44000002)) \ + /* The PC is just after an `sc' instruction. \ + This is a system call in progress; %r0 holds the call number. */ \ + *(callno) = (state)->r0; \ + _hurdsig_end_catch_fault (); \ + result; \ + }); \ +}) + +struct mach_msg_trap_args + { + /* This is the order of arguments to mach_msg_trap. */ + mach_msg_header_t *msg; + mach_msg_option_t option; + mach_msg_size_t send_size; + mach_msg_size_t rcv_size; + mach_port_t rcv_name; + mach_msg_timeout_t timeout; + mach_port_t notify; + }; + +/* This cannot be an inline function because it calls setjmp. */ +#define MSG_EXAMINE(state, msgid, rcv_name, send_name, option, timeout) \ +({ \ + mach_msg_header_t *msg = (mach_msg_header_t *) (state)->r3; \ + *(option) = (mach_msg_option_t) (state)->r4; \ + *(rcv_name) = (mach_port_t) (state)->r7; \ + *(timeout) = (mach_msg_timeout_t) (state)->r8; \ + (msg == 0) ? \ + ({ \ + *(send_name) = MACH_PORT_NULL; \ + *(msgid) = 0; \ + 0; \ + }) : \ + (_hurdsig_catch_memory_fault (msg) ? -1 : \ + ({ \ + *(send_name) = msg->msgh_remote_port; \ + *(msgid) = msg->msgh_id; \ + _hurdsig_end_catch_fault (); \ + 0; \ + }) \ + ); \ +}) \ diff --git a/sysdeps/mach/hurd/powerpc/longjmp-ts.c b/sysdeps/mach/hurd/powerpc/longjmp-ts.c new file mode 100644 index 0000000..4a59f16 --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/longjmp-ts.c @@ -0,0 +1,56 @@ +/* Perform a `longjmp' on a Mach thread_state. PowerPC version. + Copyright (C) 1991,94,95,97,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <hurd/signal.h> +#include <setjmp.h> +#include <mach/thread_status.h> + + +/* Set up STATE to do the equivalent of `longjmp (ENV, VAL);'. */ + +void +_hurd_longjmp_thread_state (void *state, jmp_buf env, int val) +{ + struct ppc_thread_state *ts = state; + + /* XXX should we set up the FPRs as well? And how? */ + ts->r1 = env[0].__jmpbuf[JB_GPR1]; + ts->r2 = env[0].__jmpbuf[JB_GPR2]; + ts->r14 = env[0].__jmpbuf[JB_GPRS+0]; + ts->r15 = env[0].__jmpbuf[JB_GPRS+1]; + ts->r16 = env[0].__jmpbuf[JB_GPRS+2]; + ts->r17 = env[0].__jmpbuf[JB_GPRS+3]; + ts->r18 = env[0].__jmpbuf[JB_GPRS+4]; + ts->r19 = env[0].__jmpbuf[JB_GPRS+5]; + ts->r20 = env[0].__jmpbuf[JB_GPRS+6]; + ts->r21 = env[0].__jmpbuf[JB_GPRS+7]; + ts->r22 = env[0].__jmpbuf[JB_GPRS+8]; + ts->r23 = env[0].__jmpbuf[JB_GPRS+9]; + ts->r24 = env[0].__jmpbuf[JB_GPRS+10]; + ts->r25 = env[0].__jmpbuf[JB_GPRS+11]; + ts->r26 = env[0].__jmpbuf[JB_GPRS+12]; + ts->r27 = env[0].__jmpbuf[JB_GPRS+13]; + ts->r28 = env[0].__jmpbuf[JB_GPRS+14]; + ts->r29 = env[0].__jmpbuf[JB_GPRS+15]; + ts->r30 = env[0].__jmpbuf[JB_GPRS+16]; + ts->r31 = env[0].__jmpbuf[JB_GPRS+17]; + ts->cr = env[0].__jmpbuf[JB_CR]; + ts->r3 = val ?: 1; + ts->srr0 = ts->lr = env[0].__jmpbuf[JB_LR]; +} diff --git a/sysdeps/mach/hurd/powerpc/register-dump.h b/sysdeps/mach/hurd/powerpc/register-dump.h new file mode 100644 index 0000000..0377175 --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/register-dump.h @@ -0,0 +1,120 @@ +/* Dump registers. PowerPC/Hurd version. + Copyright (C) 1998, 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sys/uio.h> +#include <stdio-common/_itoa.h> + +/* This prints out the information in the following form: */ +static const char dumpform[] = "\ +Register dump:\n\ +fp0-3: 0000030%0000031% 0000032%0000033% 0000034%0000035% 0000036%0000037%\n\ +fp4-7: 0000038%0000039% 000003a%000003b% 000003c%000003d% 000003e%000003f%\n\ +fp8-11: 0000040%0000041% 0000042%0000043% 0000044%0000045% 0000046%0000047%\n\ +fp12-15: 0000048%0000049% 000004a%000004b% 000004c%000004d% 000004e%000004f%\n\ +fp16-19: 0000050%0000051% 0000052%0000053% 0000054%0000055% 0000056%0000057%\n\ +fp20-23: 0000058%0000059% 000005a%000005b% 000005c%000005d% 000005e%000005f%\n\ +fp24-27: 0000060%0000061% 0000062%0000063% 0000064%0000065% 0000066%0000067%\n\ +fp28-31: 0000068%0000069% 000006a%000006b% 000006c%000006d% 000006e%000006f%\n\ +r0 =0000002% sp =0000003% r2 =0000004% r3 =0000005%\n\ +r4 =0000006% r5 =0000007% r6 =0000008% r7 =0000009% sr0=0000000% sr1=0000001%\n\ +r8 =000000a% r9 =000000b% r10=000000c% r11=000000d% cr=0000022% xer=0000023%\n\ +r12=000000e% r13=000000f% r14=0000010% r15=0000011% lr=0000024% ctr=0000025%\n\ +r16=0000012% r17=0000013% r18=0000014% r19=0000015% mq=0000026% fcr=0000071%\n\ +r20=0000016% r21=0000017% r22=0000018% r23=0000019% dar=0000028% dsi=0000029%\n\ +r24=000001a% r25=000001b% r26=000001c% r27=000001d% exc=000002a%\n\ +r28=000001e% r29=000001f% r30=0000020% r31=0000021%\n\ +"; + +/* Most of the fields are self-explanatory. 'sr0' is the next + instruction to execute, from SRR0, which may have some relationship + with the instruction that caused the exception. 'r3*' is the value + that will be returned in register 3 when the current system call + returns. 'sr1' is SRR1, bits 16-31 of which are copied from the MSR: + + 16 - External interrupt enable + 17 - Privilege level (1=user, 0=supervisor) + 18 - FP available + 19 - Machine check enable (if clear, processor locks up on machine check) + 20 - FP exception mode bit 0 (FP exceptions recoverable) + 21 - Single-step trace enable + 22 - Branch trace enable + 23 - FP exception mode bit 1 + 25 - exception prefix (if set, exceptions are taken from 0xFFFnnnnn, + otherwise from 0x000nnnnn). + 26 - Instruction address translation enabled. + 27 - Data address translation enabled. + 30 - Exception is recoverable (otherwise, don't try to return). + 31 - Little-endian mode enable. + + 'Trap' is the address of the exception: + + 00200 - Machine check exception (memory parity error, for instance) + 00300 - Data access exception (memory not mapped, see dsisr for why) + 00400 - Instruction access exception (memory not mapped) + 00500 - External interrupt + 00600 - Alignment exception (see dsisr for more information) + 00700 - Program exception (illegal/trap instruction, FP exception) + 00800 - FP unavailable (should not be seen by user code) + 00900 - Decrementer exception (for instance, SIGALRM) + 00A00 - I/O controller interface exception + 00C00 - System call exception (for instance, kill(3)). + 00E00 - FP assist exception (optional FP instructions, etc.) + + 'dar' is the memory location, for traps 00300, 00400, 00600, 00A00. + 'dsisr' has the following bits under trap 00300: + 0 - direct-store error exception + 1 - no page table entry for page + 4 - memory access not permitted + 5 - trying to access I/O controller space or using lwarx/stwcx on + non-write-cached memory + 6 - access was store + 9 - data access breakpoint hit + 10 - segment table search failed to find translation (64-bit ppcs only) + 11 - I/O controller instruction not permitted + For trap 00400, the same bits are set in SRR1 instead. + For trap 00600, bits 12-31 of the DSISR set to allow emulation of + the instruction without actually having to read it from memory. +*/ + +#define xtoi(x) (x >= 'a' ? x + 10 - 'a' : x - '0') + +static void +register_dump (int fd, struct sigcontext *ctx) +{ + char buffer[sizeof(dumpform)]; + char *bufferpos; + unsigned regno; + unsigned *regs = (unsigned *)(&ctx->sc_srr0); + + memcpy(buffer, dumpform, sizeof(dumpform)); + + /* Generate the output. */ + while ((bufferpos = memchr (buffer, '%', sizeof(dumpform)))) + { + regno = xtoi (bufferpos[-1]) | xtoi (bufferpos[-2]) << 4; + memset (bufferpos-2, '0', 3); + _itoa_word (regs[regno], bufferpos+1, 16, 0); + } + + /* Write the output. */ + write (fd, buffer, sizeof(buffer)); +} + +#define REGISTER_DUMP \ + register_dump (fd, ctx) diff --git a/sysdeps/mach/hurd/powerpc/sigreturn.c b/sysdeps/mach/hurd/powerpc/sigreturn.c new file mode 100644 index 0000000..18e37a3 --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/sigreturn.c @@ -0,0 +1,186 @@ +/* Return from signal handler for Hurd. PowerPC version. + Copyright (C) 1996,97,98,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <hurd.h> +#include <hurd/signal.h> +#include <hurd/threadvar.h> +#include <stdlib.h> + +int +__sigreturn (struct sigcontext *scp) +{ + struct hurd_sigstate *ss; + mach_port_t *reply_port; + + if (scp == NULL || (scp->sc_mask & _SIG_CANT_MASK)) + { + errno = EINVAL; + return -1; + } + + ss = _hurd_self_sigstate (); + __spin_lock (&ss->lock); + + /* Restore the set of blocked signals, and the intr_port slot. */ + ss->blocked = scp->sc_mask; + ss->intr_port = scp->sc_intr_port; + + /* Check for pending signals that were blocked by the old set. */ + if (ss->pending & ~ss->blocked) + { + /* There are pending signals that just became unblocked. Wake up the + signal thread to deliver them. But first, squirrel away SCP where + the signal thread will notice it if it runs another handler, and + arrange to have us called over again in the new reality. */ + ss->context = scp; + __spin_unlock (&ss->lock); + __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ()); + /* If a pending signal was handled, sig_post never returned. */ + __spin_lock (&ss->lock); + ss->context = NULL; + } + + if (scp->sc_onstack) + { + ss->sigaltstack.ss_flags &= ~SS_ONSTACK; /* XXX threadvars */ + /* XXX cannot unlock until off sigstack */ + abort (); + } + else + __spin_unlock (&ss->lock); + + /* Destroy the MiG reply port used by the signal handler, and restore the + reply port in use by the thread when interrupted. */ + reply_port = + (mach_port_t *) __hurd_threadvar_location (_HURD_THREADVAR_MIG_REPLY); + if (*reply_port) + { + mach_port_t port = *reply_port; + + /* Assigning MACH_PORT_DEAD here tells libc's mig_get_reply_port not to + get another reply port, but avoids mig_dealloc_reply_port trying to + deallocate it after the receive fails (which it will, because the + reply port will be bogus, whether we do this or not). */ + *reply_port = MACH_PORT_DEAD; + + __mach_port_destroy (__mach_task_self (), port); + } + *reply_port = scp->sc_reply_port; + + /* Restore FPU state. */ +#define restore_fpr(n) \ + asm volatile ("lfd " #n ",%0(31)" : : "i" (n * 4)) + + asm volatile ("mr 31,%0" : : "r" (scp->sc_fprs)); + + /* Restore the floating-point control/status register. */ + asm volatile ("lfd 0,256(31)"); + asm volatile ("mtfsf 0xff,0"); + + /* Restore floating-point registers. */ + restore_fpr (0); + restore_fpr (1); + restore_fpr (2); + restore_fpr (3); + restore_fpr (4); + restore_fpr (5); + restore_fpr (6); + restore_fpr (7); + restore_fpr (8); + restore_fpr (9); + restore_fpr (10); + restore_fpr (11); + restore_fpr (12); + restore_fpr (13); + restore_fpr (14); + restore_fpr (15); + restore_fpr (16); + restore_fpr (17); + restore_fpr (18); + restore_fpr (19); + restore_fpr (20); + restore_fpr (21); + restore_fpr (22); + restore_fpr (23); + restore_fpr (24); + restore_fpr (25); + restore_fpr (26); + restore_fpr (27); + restore_fpr (28); + restore_fpr (29); + restore_fpr (30); + restore_fpr (31); + + /* Load all the registers from the sigcontext. */ +#define restore_gpr(n) \ + asm volatile ("lwz " #n ",%0(31)" : : "i" (n * 4)) + + asm volatile ("addi 31,31,-188"); /* r31 = scp->gprs */ + + /* Restore the special purpose registers. */ + asm volatile ("lwz 0,128(31); mtcr 0"); + asm volatile ("lwz 0,132(31); mtxer 0"); + asm volatile ("lwz 0,136(31); mtlr 0"); + asm volatile ("lwz 0,-8(31); mtctr 0"); /* XXX this is the PC */ +#if 0 + asm volatile ("lwz 0,144(31); mtmq %0"); /* PPC601 only */ +#endif + + /* Restore the normal registers. */ + restore_gpr (0); + restore_gpr (1); + restore_gpr (2); + restore_gpr (3); + restore_gpr (4); + restore_gpr (5); + restore_gpr (6); + restore_gpr (7); + restore_gpr (8); + restore_gpr (9); + restore_gpr (10); + restore_gpr (11); + restore_gpr (12); + restore_gpr (13); + restore_gpr (14); + restore_gpr (15); + restore_gpr (16); + restore_gpr (17); + restore_gpr (18); + restore_gpr (19); + restore_gpr (20); + restore_gpr (21); + restore_gpr (22); + restore_gpr (23); + restore_gpr (24); + restore_gpr (25); + restore_gpr (26); + restore_gpr (27); + restore_gpr (28); + restore_gpr (29); + restore_gpr (30); + restore_gpr (31); + + /* Return. */ + asm volatile ("bctr"); /* XXX CTR is not restored! */ + + /* NOTREACHED */ + return -1; +} + +weak_alias (__sigreturn, sigreturn) diff --git a/sysdeps/mach/hurd/powerpc/static-start.S b/sysdeps/mach/hurd/powerpc/static-start.S new file mode 100644 index 0000000..209972c --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/static-start.S @@ -0,0 +1,59 @@ +/* Startup code for statically linked Hurd/PowerPC binaries. + Copyright (C) 1998,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> + + /* These are the various addresses we require. */ + .section ".rodata" + .align 2 + weak_extern(_init) + weak_extern(_fini) +L(start_addresses): + .long _SDA_BASE_ + .long JUMPTARGET(main) + .long JUMPTARGET(_init) + .long JUMPTARGET(_fini) + ASM_SIZE_DIRECTIVE(L(start_addresses)) + + .section ".text" +ENTRY(_start) + /* Save the stack pointer to pass to _hurd_stack_setup. */ + mr r3,r1 + /* Set up an initial stack frame. */ + li r0,0 + stwu r0,-16(r1) + /* Call _hurd_stack_setup. */ + bl JUMPTARGET(_hurd_stack_setup) + /* Pass the argument data to __libc_start_main. */ + addi r9,r1,16 + /* Clear the LR. */ + li r0,0 + mtlr r0 + /* Set r13 to point at the 'small data area', and put the address of + start_addresses in r8... */ + lis r8,L(start_addresses)@ha + lwzu r13,L(start_addresses)@l(r8) + /* and continue in libc-start, in glibc. */ + b JUMPTARGET(__libc_start_main) +END(_start) + +/* Define a symbol for the first piece of initialized data. */ + .section ".data" +__data_start: +weak_alias (__data_start, data_start) diff --git a/sysdeps/mach/hurd/powerpc/trampoline.c b/sysdeps/mach/hurd/powerpc/trampoline.c new file mode 100644 index 0000000..4e5d675 --- /dev/null +++ b/sysdeps/mach/hurd/powerpc/trampoline.c @@ -0,0 +1,256 @@ +/* Set thread_state for sighandler, and sigcontext to recover. For PowerPC. + Copyright (C) 1994,95,96,97,98,99,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <hurd/signal.h> +#include <hurd/userlink.h> +#include "thread_state.h" +#include <assert.h> +#include <errno.h> +#include "hurdfault.h" +#include "intr-msg.h" + +struct sigcontext * +_hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler, + int signo, struct hurd_signal_detail *detail, + volatile int rpc_wait, + struct machine_thread_all_state *state) +{ + void trampoline (void); + void rpc_wait_trampoline (void); + void *volatile sigsp; + struct sigcontext *scp; + + if (ss->context) + { + /* We have a previous sigcontext that sigreturn was about + to restore when another signal arrived. We will just base + our setup on that. */ + if (! _hurdsig_catch_memory_fault (ss->context)) + { + memcpy (&state->basic, &ss->context->sc_ppc_thread_state, + sizeof (state->basic)); + memcpy (&state->exc, &ss->context->sc_ppc_exc_state, + sizeof (state->exc)); + memcpy (&state->fpu, &ss->context->sc_ppc_float_state, + sizeof (state->fpu)); + state->set = (1 << PPC_THREAD_STATE) | (1 << PPC_EXCEPTION_STATE) + | (1 << PPC_FLOAT_STATE); + } + } + + if (! machine_get_basic_state (ss->thread, state)) + return NULL; + + if ((ss->actions[signo].sa_flags & SA_ONSTACK) && + !(ss->sigaltstack.ss_flags & (SS_DISABLE|SS_ONSTACK))) + { + sigsp = ss->sigaltstack.ss_sp + ss->sigaltstack.ss_size; + ss->sigaltstack.ss_flags |= SS_ONSTACK; + /* XXX need to set up base of new stack for + per-thread variables, cthreads. */ + } + else + sigsp = (char *) state->basic.SP; + + /* Set up the sigcontext structure on the stack. This is all the stack + needs, since the args are passed in registers (below). */ + sigsp -= sizeof (*scp); + scp = sigsp; + sigsp -= 16; /* Reserve some space for a stack frame. */ + + if (_hurdsig_catch_memory_fault (scp)) + { + /* We got a fault trying to write the stack frame. + We cannot set up the signal handler. + Returning NULL tells our caller, who will nuke us with a SIGILL. */ + return NULL; + } + else + { + int ok; + + /* Set up the sigcontext from the current state of the thread. */ + + scp->sc_onstack = ss->sigaltstack.ss_flags & SS_ONSTACK ? 1 : 0; + + /* struct sigcontext is laid out so that starting at sc_srr0 + mimics a struct ppc_thread_state. */ + memcpy (&scp->sc_ppc_thread_state, + &state->basic, sizeof (state->basic)); + + /* struct sigcontext is laid out so that starting at sc_dar + mimics a struct ppc_exc_state. */ + ok = machine_get_state (ss->thread, state, PPC_EXCEPTION_STATE, + &state->exc, &scp->sc_ppc_exc_state, + sizeof (state->exc)); + + /* struct sigcontext is laid out so that starting at sc_fprs[0] + mimics a struct ppc_float_state. */ + if (ok) + ok = machine_get_state (ss->thread, state, PPC_FLOAT_STATE, + &state->fpu, &scp->sc_ppc_float_state, + sizeof (state->fpu)); + + _hurdsig_end_catch_fault (); + + if (!ok) + return NULL; + } + + /* Modify the thread state to call the trampoline code on the new stack. */ + if (rpc_wait) + { + /* The signalee thread was blocked in a mach_msg_trap system call, + still waiting for a reply. We will have it run the special + trampoline code which retries the message receive before running + the signal handler. + + To do this we change the OPTION argument in its registers to + enable only message reception, since the request message has + already been sent. */ + + /* The system call arguments are stored in consecutive registers + starting with r3. */ + struct mach_msg_trap_args *args = (void *) &state->basic.r3; + + if (_hurdsig_catch_memory_fault (args)) + { + /* Faulted accessing ARGS. Bomb. */ + return NULL; + } + + assert (args->option & MACH_RCV_MSG); + /* Disable the message-send, since it has already completed. The + calls we retry need only wait to receive the reply message. */ + args->option &= ~MACH_SEND_MSG; + + /* Limit the time to receive the reply message, in case the server + claimed that `interrupt_operation' succeeded but in fact the RPC + is hung. */ + args->option |= MACH_RCV_TIMEOUT; + args->timeout = _hurd_interrupted_rpc_timeout; + + _hurdsig_end_catch_fault (); + + state->basic.PC = (int) rpc_wait_trampoline; + /* After doing the message receive, the trampoline code will need to + update the r3 value to be restored by sigreturn. To simplify + the assembly code, we pass the address of its slot in SCP to the + trampoline code in r10. */ + state->basic.r10 = (long int) &scp->sc_gprs[3]; + /* We must preserve the mach_msg_trap args in r3..r9. + Pass the handler args to the trampoline code in r11..r13. */ + state->basic.r11 = signo; + state->basic.r12 = detail->code; + state->basic.r13 = (int) scp; + } + else + { + state->basic.PC = (int) trampoline; + state->basic.r3 = signo; + state->basic.r4 = detail->code; + state->basic.r5 = (int) scp; + } + + state->basic.r1 = (int) sigsp; /* r1 is the stack pointer. */ + + /* We pass the handler function to the trampoline code in ctr. */ + state->basic.ctr = (int) handler; + /* In r15, we store the address of __sigreturn itself, + for the trampoline code to use. */ + state->basic.r15 = (int) &__sigreturn; + /* In r16, we save the SCP value to pass to __sigreturn + after the handler returns. */ + state->basic.r16 = (int) scp; + + /* In r3, we store a pointer to the registers in STATE so that the + trampoline code can load the registers from that. For some reason, + thread_set_state doesn't set all registers. */ + state->basic.r17 = state->basic.r3; /* Store the real r3 in r17. */ + state->basic.r3 = (int) &state->basic.r0; + + return scp; +} + +/* The trampoline code follows. This used to be located inside + _hurd_setup_sighandler, but was optimized away by gcc 2.95. */ + +/* This function sets some registers which the trampoline code uses + and which are not automatically set by thread_set_state. + In r3 we have a pointer to the registers in STATE. */ +asm ("trampoline_load_registers:\n" + "lwz 17,68(3)\n" /* The real r3. */ + "lwz 4,16(3)\n" + "lwz 5,20(3)\n" + "lwz 6,24(3)\n" + "lwz 7,28(3)\n" + "lwz 8,32(3)\n" + "lwz 9,36(3)\n" + "lwz 10,40(3)\n" + "lwz 11,44(3)\n" + "lwz 12,48(3)\n" + "lwz 13,52(3)\n" + "lwz 14,56(3)\n" + "lwz 15,60(3)\n" + "lwz 16,64(3)\n" + "mr 3,17\n" + "blr\n"); + +asm ("rpc_wait_trampoline:\n"); + /* This is the entry point when we have an RPC reply message to receive + before running the handler. The MACH_MSG_SEND bit has already been + cleared in the OPTION argument in our registers. For our convenience, + r10 points to the sc_regs[3] member of the sigcontext (saved r3). */ + +asm (/* Retry the interrupted mach_msg system call. */ + "bl trampoline_load_registers\n" + "li 0, -25\n" /* mach_msg_trap */ + "sc\n" + /* When the sigcontext was saved, r3 was MACH_RCV_INTERRUPTED. But + now the message receive has completed and the original caller of + the RPC (i.e. the code running when the signal arrived) needs to + see the final return value of the message receive in r3. So + store the new r3 value into the sc_regs[3] member of the sigcontext + (whose address is in r10 to make this code simpler). */ + "stw 3, 0(10)\n" + /* Since the argument registers needed to have the mach_msg_trap + arguments, we've stored the arguments to the handler function + in registers r11..r13 of the state structure. */ + "mr 3,11\n" + "mr 4,12\n" + "mr 5,13\n"); + +asm ("trampoline:\n"); + /* Entry point for running the handler normally. The arguments to the + handler function are already in the standard registers: + + r3 SIGNO + r4 SIGCODE + r5 SCP + + r16 also contains SCP; this value is callee-saved (and so should not get + clobbered by running the handler). We use this saved value to pass to + __sigreturn, so the handler can clobber the argument registers if it + likes. */ +asm ("bl trampoline_load_registers\n" + "bctrl\n" /* Call the handler function. */ + "mtctr 15\n" /* Copy &__sigreturn to CTR. */ + "mr 3,16\n" /* Copy the saved SCP to r3. */ + "bctr\n" /* Call __sigreturn (SCP). */ + ); |