summaryrefslogtreecommitdiff
path: root/erts/emulator/sys/ose/sys_float.c
diff options
context:
space:
mode:
Diffstat (limited to 'erts/emulator/sys/ose/sys_float.c')
-rw-r--r--erts/emulator/sys/ose/sys_float.c845
1 files changed, 0 insertions, 845 deletions
diff --git a/erts/emulator/sys/ose/sys_float.c b/erts/emulator/sys/ose/sys_float.c
deleted file mode 100644
index 51875792ae..0000000000
--- a/erts/emulator/sys/ose/sys_float.c
+++ /dev/null
@@ -1,845 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2001-2013. All Rights Reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * %CopyrightEnd%
- */
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include "sys.h"
-#include "global.h"
-#include "erl_process.h"
-
-
-#ifdef NO_FPE_SIGNALS
-
-void
-erts_sys_init_float(void)
-{
-# ifdef SIGFPE
- sys_sigset(SIGFPE, SIG_IGN); /* Ignore so we can test for NaN and Inf */
-# endif
-}
-
-#else /* !NO_FPE_SIGNALS */
-
-#ifdef ERTS_SMP
-static erts_tsd_key_t fpe_key;
-
-/* once-only initialisation early in the main thread (via erts_sys_init_float()) */
-static void erts_init_fp_exception(void)
-{
- /* XXX: the wrappers prevent using a pthread destructor to
- deallocate the key's value; so when/where do we do that? */
- erts_tsd_key_create(&fpe_key);
-}
-
-void erts_thread_init_fp_exception(void)
-{
- unsigned long *fpe = erts_alloc(ERTS_ALC_T_FP_EXCEPTION, sizeof(*fpe));
- *fpe = 0L;
- erts_tsd_set(fpe_key, fpe);
-}
-
-static ERTS_INLINE volatile unsigned long *erts_thread_get_fp_exception(void)
-{
- return (volatile unsigned long*)erts_tsd_get(fpe_key);
-}
-#else /* !SMP */
-#define erts_init_fp_exception() /*empty*/
-static volatile unsigned long fp_exception;
-#define erts_thread_get_fp_exception() (&fp_exception)
-#endif /* SMP */
-
-volatile unsigned long *erts_get_current_fp_exception(void)
-{
- Process *c_p;
-
- c_p = erts_get_current_process();
- if (c_p)
- return &c_p->fp_exception;
- return erts_thread_get_fp_exception();
-}
-
-static void set_current_fp_exception(unsigned long pc)
-{
- volatile unsigned long *fpexnp = erts_get_current_fp_exception();
- ASSERT(fpexnp != NULL);
- *fpexnp = pc;
-}
-
-void erts_fp_check_init_error(volatile unsigned long *fpexnp)
-{
- char buf[64];
- snprintf(buf, sizeof buf, "ERTS_FP_CHECK_INIT at %p: detected unhandled FPE at %p\r\n",
- __builtin_return_address(0), (void*)*fpexnp);
- if (write(2, buf, strlen(buf)) <= 0)
- erts_exit(ERTS_ABORT_EXIT, "%s", buf);
- *fpexnp = 0;
-#if defined(__i386__) || defined(__x86_64__)
- erts_restore_fpu();
-#endif
-}
-
-/* Is there no standard identifier for Darwin/MacOSX ? */
-#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
-#define __DARWIN__ 1
-#endif
-
-#if (defined(__i386__) || defined(__x86_64__)) && defined(__GNUC__)
-
-static void unmask_x87(void)
-{
- unsigned short cw;
-
- __asm__ __volatile__("fstcw %0" : "=m"(cw));
- cw &= ~(0x01|0x04|0x08); /* unmask IM, ZM, OM */
- __asm__ __volatile__("fldcw %0" : : "m"(cw));
-}
-
-/* mask x87 FPE, return true if the previous state was unmasked */
-static int mask_x87(void)
-{
- unsigned short cw;
- int unmasked;
-
- __asm__ __volatile__("fstcw %0" : "=m"(cw));
- unmasked = (cw & (0x01|0x04|0x08)) == 0;
- /* or just set cw = 0x37f */
- cw |= (0x01|0x04|0x08); /* mask IM, ZM, OM */
- __asm__ __volatile__("fldcw %0" : : "m"(cw));
- return unmasked;
-}
-
-static void unmask_sse2(void)
-{
- unsigned int mxcsr;
-
- __asm__ __volatile__("stmxcsr %0" : "=m"(mxcsr));
- mxcsr &= ~(0x003F|0x0680); /* clear exn flags, unmask OM, ZM, IM (not PM, UM, DM) */
- __asm__ __volatile__("ldmxcsr %0" : : "m"(mxcsr));
-}
-
-/* mask SSE2 FPE, return true if the previous state was unmasked */
-static int mask_sse2(void)
-{
- unsigned int mxcsr;
- int unmasked;
-
- __asm__ __volatile__("stmxcsr %0" : "=m"(mxcsr));
- unmasked = (mxcsr & 0x0680) == 0;
- /* or just set mxcsr = 0x1f80 */
- mxcsr &= ~0x003F; /* clear exn flags */
- mxcsr |= 0x0680; /* mask OM, ZM, IM (not PM, UM, DM) */
- __asm__ __volatile__("ldmxcsr %0" : : "m"(mxcsr));
- return unmasked;
-}
-
-#if defined(__x86_64__)
-
-static inline int cpu_has_sse2(void) { return 1; }
-
-#else /* !__x86_64__ */
-
-/*
- * Check if an x86-32 processor has SSE2.
- */
-static unsigned int xor_eflags(unsigned int mask)
-{
- unsigned int eax, edx;
-
- eax = mask; /* eax = mask */
- __asm__("pushfl\n\t"
- "popl %0\n\t" /* edx = original EFLAGS */
- "xorl %0, %1\n\t" /* eax = mask ^ EFLAGS */
- "pushl %1\n\t"
- "popfl\n\t" /* new EFLAGS = mask ^ original EFLAGS */
- "pushfl\n\t"
- "popl %1\n\t" /* eax = new EFLAGS */
- "xorl %0, %1\n\t" /* eax = new EFLAGS ^ old EFLAGS */
- "pushl %0\n\t"
- "popfl" /* restore original EFLAGS */
- : "=d"(edx), "=a"(eax)
- : "1"(eax));
- return eax;
-}
-
-static __inline__ unsigned int cpuid_eax(unsigned int op)
-{
- unsigned int eax, save_ebx;
-
- /* In PIC mode i386 reserves EBX. So we must save
- and restore it ourselves to not upset gcc. */
- __asm__(
- "movl %%ebx, %1\n\t"
- "cpuid\n\t"
- "movl %1, %%ebx"
- : "=a"(eax), "=m"(save_ebx)
- : "0"(op)
- : "cx", "dx");
- return eax;
-}
-
-static __inline__ unsigned int cpuid_edx(unsigned int op)
-{
- unsigned int eax, edx, save_ebx;
-
- /* In PIC mode i386 reserves EBX. So we must save
- and restore it ourselves to not upset gcc. */
- __asm__(
- "movl %%ebx, %2\n\t"
- "cpuid\n\t"
- "movl %2, %%ebx"
- : "=a"(eax), "=d"(edx), "=m"(save_ebx)
- : "0"(op)
- : "cx");
- return edx;
-}
-
-/* The AC bit, bit #18, is a new bit introduced in the EFLAGS
- * register on the Intel486 processor to generate alignment
- * faults. This bit cannot be set on the Intel386 processor.
- */
-static __inline__ int is_386(void)
-{
- return ((xor_eflags(1<<18) >> 18) & 1) == 0;
-}
-
-/* Newer x86 processors have a CPUID instruction, as indicated by
- * the ID bit (#21) in EFLAGS being modifiable.
- */
-static __inline__ int has_CPUID(void)
-{
- return (xor_eflags(1<<21) >> 21) & 1;
-}
-
-static int cpu_has_sse2(void)
-{
- unsigned int maxlev, features;
- static int has_sse2 = -1;
-
- if (has_sse2 >= 0)
- return has_sse2;
- has_sse2 = 0;
-
- if (is_386())
- return 0;
- if (!has_CPUID())
- return 0;
- maxlev = cpuid_eax(0);
- /* Intel A-step Pentium had a preliminary version of CPUID.
- It also didn't have SSE2. */
- if ((maxlev & 0xFFFFFF00) == 0x0500)
- return 0;
- /* If max level is zero then CPUID cannot report any features. */
- if (maxlev == 0)
- return 0;
- features = cpuid_edx(1);
- has_sse2 = (features & (1 << 26)) != 0;
-
- return has_sse2;
-}
-#endif /* !__x86_64__ */
-
-static void unmask_fpe(void)
-{
- __asm__ __volatile__("fnclex");
- unmask_x87();
- if (cpu_has_sse2())
- unmask_sse2();
-}
-
-static void unmask_fpe_conditional(int unmasked)
-{
- if (unmasked)
- unmask_fpe();
-}
-
-/* mask x86 FPE, return true if the previous state was unmasked */
-static int mask_fpe(void)
-{
- int unmasked;
-
- unmasked = mask_x87();
- if (cpu_has_sse2())
- unmasked |= mask_sse2();
- return unmasked;
-}
-
-void erts_restore_fpu(void)
-{
- __asm__ __volatile__("fninit");
- unmask_x87();
- if (cpu_has_sse2())
- unmask_sse2();
-}
-
-#elif defined(__sparc__) && defined(__linux__)
-
-#if defined(__arch64__)
-#define LDX "ldx"
-#define STX "stx"
-#else
-#define LDX "ld"
-#define STX "st"
-#endif
-
-static void unmask_fpe(void)
-{
- unsigned long fsr;
-
- __asm__(STX " %%fsr, %0" : "=m"(fsr));
- fsr &= ~(0x1FUL << 23); /* clear FSR[TEM] field */
- fsr |= (0x1AUL << 23); /* enable NV, OF, DZ exceptions */
- __asm__ __volatile__(LDX " %0, %%fsr" : : "m"(fsr));
-}
-
-static void unmask_fpe_conditional(int unmasked)
-{
- if (unmasked)
- unmask_fpe();
-}
-
-/* mask SPARC FPE, return true if the previous state was unmasked */
-static int mask_fpe(void)
-{
- unsigned long fsr;
- int unmasked;
-
- __asm__(STX " %%fsr, %0" : "=m"(fsr));
- unmasked = ((fsr >> 23) & 0x1A) == 0x1A;
- fsr &= ~(0x1FUL << 23); /* clear FSR[TEM] field */
- __asm__ __volatile__(LDX " %0, %%fsr" : : "m"(fsr));
- return unmasked;
-}
-
-#elif (defined(__powerpc__) && defined(__linux__)) || (defined(__ppc__) && defined(__DARWIN__))
-
-#if defined(__linux__)
-#include <sys/prctl.h>
-
-static void set_fpexc_precise(void)
-{
- if (prctl(PR_SET_FPEXC, PR_FP_EXC_PRECISE) < 0) {
- perror("PR_SET_FPEXC");
- exit(1);
- }
-}
-
-#elif defined(__DARWIN__)
-
-#include <mach/mach.h>
-#include <pthread.h>
-
-/*
- * FE0 FE1 MSR bits
- * 0 0 floating-point exceptions disabled
- * 0 1 floating-point imprecise nonrecoverable
- * 1 0 floating-point imprecise recoverable
- * 1 1 floating-point precise mode
- *
- * Apparently:
- * - Darwin 5.5 (MacOS X <= 10.1) starts with FE0 == FE1 == 0,
- * and resets FE0 and FE1 to 0 after each SIGFPE.
- * - Darwin 6.0 (MacOS X 10.2) starts with FE0 == FE1 == 1,
- * and does not reset FE0 or FE1 after a SIGFPE.
- */
-#define FE0_MASK (1<<11)
-#define FE1_MASK (1<<8)
-
-/* a thread cannot get or set its own MSR bits */
-static void *fpu_fpe_enable(void *arg)
-{
- thread_t t = *(thread_t*)arg;
- struct ppc_thread_state state;
- unsigned int state_size = PPC_THREAD_STATE_COUNT;
-
- if (thread_get_state(t, PPC_THREAD_STATE, (natural_t*)&state, &state_size) != KERN_SUCCESS) {
- perror("thread_get_state");
- exit(1);
- }
- if ((state.srr1 & (FE1_MASK|FE0_MASK)) != (FE1_MASK|FE0_MASK)) {
-#if 1
- /* This would also have to be performed in the SIGFPE handler
- to work around the MSR reset older Darwin releases do. */
- state.srr1 |= (FE1_MASK|FE0_MASK);
- thread_set_state(t, PPC_THREAD_STATE, (natural_t*)&state, state_size);
-#else
- fprintf(stderr, "srr1 == 0x%08x, your Darwin is too old\n", state.srr1);
- exit(1);
-#endif
- }
- return NULL; /* Ok, we appear to be on Darwin 6.0 or later */
-}
-
-static void set_fpexc_precise(void)
-{
- thread_t self = mach_thread_self();
- pthread_t enabler;
-
- if (pthread_create(&enabler, NULL, fpu_fpe_enable, &self)) {
- perror("pthread_create");
- } else if (pthread_join(enabler, NULL)) {
- perror("pthread_join");
- }
-}
-
-#endif
-
-static void set_fpscr(unsigned int fpscr)
-{
- union {
- double d;
- unsigned int fpscr[2];
- } u;
-
- u.fpscr[0] = 0xFFF80000;
- u.fpscr[1] = fpscr;
- __asm__ __volatile__("mtfsf 255,%0" : : "f"(u.d));
-}
-
-static unsigned int get_fpscr(void)
-{
- union {
- double d;
- unsigned int fpscr[2];
- } u;
-
- __asm__("mffs %0" : "=f"(u.d));
- return u.fpscr[1];
-}
-
-static void unmask_fpe(void)
-{
- set_fpexc_precise();
- set_fpscr(0x80|0x40|0x10); /* VE, OE, ZE; not UE or XE */
-}
-
-static void unmask_fpe_conditional(int unmasked)
-{
- if (unmasked)
- unmask_fpe();
-}
-
-/* mask PowerPC FPE, return true if the previous state was unmasked */
-static int mask_fpe(void)
-{
- int unmasked;
-
- unmasked = (get_fpscr() & (0x80|0x40|0x10)) == (0x80|0x40|0x10);
- set_fpscr(0x00);
- return unmasked;
-}
-
-#else
-
-static void unmask_fpe(void)
-{
- fpsetmask(FP_X_INV | FP_X_OFL | FP_X_DZ);
-}
-
-static void unmask_fpe_conditional(int unmasked)
-{
- if (unmasked)
- unmask_fpe();
-}
-
-/* mask IEEE FPE, return true if previous state was unmasked */
-static int mask_fpe(void)
-{
- const fp_except unmasked_mask = FP_X_INV | FP_X_OFL | FP_X_DZ;
- fp_except old_mask;
-
- old_mask = fpsetmask(0);
- return (old_mask & unmasked_mask) == unmasked_mask;
-}
-
-#endif
-
-#if (defined(__linux__) && (defined(__i386__) || defined(__x86_64__) || defined(__sparc__) || defined(__powerpc__))) || (defined(__DARWIN__) && (defined(__i386__) || defined(__x86_64__) || defined(__ppc__))) || (defined(__FreeBSD__) && (defined(__x86_64__) || defined(__i386__))) || ((defined(__NetBSD__) || defined(__OpenBSD__)) && defined(__x86_64__)) || (defined(__sun__) && defined(__x86_64__))
-
-#if defined(__linux__) && defined(__i386__)
-#if !defined(X86_FXSR_MAGIC)
-#define X86_FXSR_MAGIC 0x0000
-#endif
-#elif defined(__FreeBSD__) && defined(__x86_64__)
-#include <sys/types.h>
-#include <machine/fpu.h>
-#elif defined(__FreeBSD__) && defined(__i386__)
-#include <sys/types.h>
-#include <machine/npx.h>
-#elif defined(__DARWIN__)
-#include <machine/signal.h>
-#elif defined(__OpenBSD__) && defined(__x86_64__)
-#include <sys/types.h>
-#include <machine/fpu.h>
-#endif
-#if !(defined(__OpenBSD__) && defined(__x86_64__))
-#include <ucontext.h>
-#endif
-#include <string.h>
-
-#if defined(__linux__) && defined(__x86_64__)
-#define mc_pc(mc) ((mc)->gregs[REG_RIP])
-#elif defined(__linux__) && defined(__i386__)
-#define mc_pc(mc) ((mc)->gregs[REG_EIP])
-#elif defined(__DARWIN__) && defined(__i386__)
-#ifdef DARWIN_MODERN_MCONTEXT
-#define mc_pc(mc) ((mc)->__ss.__eip)
-#else
-#define mc_pc(mc) ((mc)->ss.eip)
-#endif
-#elif defined(__DARWIN__) && defined(__x86_64__)
-#ifdef DARWIN_MODERN_MCONTEXT
-#define mc_pc(mc) ((mc)->__ss.__rip)
-#else
-#define mc_pc(mc) ((mc)->ss.rip)
-#endif
-#elif defined(__FreeBSD__) && defined(__x86_64__)
-#define mc_pc(mc) ((mc)->mc_rip)
-#elif defined(__FreeBSD__) && defined(__i386__)
-#define mc_pc(mc) ((mc)->mc_eip)
-#elif defined(__NetBSD__) && defined(__x86_64__)
-#define mc_pc(mc) ((mc)->__gregs[_REG_RIP])
-#elif defined(__NetBSD__) && defined(__i386__)
-#define mc_pc(mc) ((mc)->__gregs[_REG_EIP])
-#elif defined(__OpenBSD__) && defined(__x86_64__)
-#define mc_pc(mc) ((mc)->sc_rip)
-#elif defined(__sun__) && defined(__x86_64__)
-#define mc_pc(mc) ((mc)->gregs[REG_RIP])
-#endif
-
-static void fpe_sig_action(int sig, siginfo_t *si, void *puc)
-{
- ucontext_t *uc = puc;
- unsigned long pc;
-
-#if defined(__linux__)
-#if defined(__x86_64__)
- mcontext_t *mc = &uc->uc_mcontext;
- fpregset_t fpstate = mc->fpregs;
- pc = mc_pc(mc);
- /* A failed SSE2 instruction will restart. To avoid
- looping we mask SSE2 exceptions now and unmask them
- again later in erts_check_fpe()/erts_restore_fpu().
- On RISCs we update PC to skip the failed instruction,
- but the ever increasing complexity of the x86 instruction
- set encoding makes that a poor solution here. */
- fpstate->mxcsr = 0x1F80;
- fpstate->swd &= ~0xFF;
-#elif defined(__i386__)
- mcontext_t *mc = &uc->uc_mcontext;
- fpregset_t fpstate = mc->fpregs;
- pc = mc_pc(mc);
- if ((fpstate->status >> 16) == X86_FXSR_MAGIC)
- ((struct _fpstate*)fpstate)->mxcsr = 0x1F80;
- fpstate->sw &= ~0xFF;
-#elif defined(__sparc__) && defined(__arch64__)
- /* on SPARC the 3rd parameter points to a sigcontext not a ucontext */
- struct sigcontext *sc = (struct sigcontext*)puc;
- pc = sc->sigc_regs.tpc;
- sc->sigc_regs.tpc = sc->sigc_regs.tnpc;
- sc->sigc_regs.tnpc += 4;
-#elif defined(__sparc__)
- /* on SPARC the 3rd parameter points to a sigcontext not a ucontext */
- struct sigcontext *sc = (struct sigcontext*)puc;
- pc = sc->si_regs.pc;
- sc->si_regs.pc = sc->si_regs.npc;
- sc->si_regs.npc = (unsigned long)sc->si_regs.npc + 4;
-#elif defined(__powerpc__)
-#if defined(__powerpc64__)
- mcontext_t *mc = &uc->uc_mcontext;
- unsigned long *regs = &mc->gp_regs[0];
-#else
- mcontext_t *mc = uc->uc_mcontext.uc_regs;
- unsigned long *regs = &mc->gregs[0];
-#endif
- pc = regs[PT_NIP];
- regs[PT_NIP] += 4;
- regs[PT_FPSCR] = 0x80|0x40|0x10; /* VE, OE, ZE; not UE or XE */
-#endif
-#elif defined(__DARWIN__) && (defined(__i386__) || defined(__x86_64__))
-#ifdef DARWIN_MODERN_MCONTEXT
- mcontext_t mc = uc->uc_mcontext;
- pc = mc_pc(mc);
- mc->__fs.__fpu_mxcsr = 0x1F80;
- *(unsigned short *)&mc->__fs.__fpu_fsw &= ~0xFF;
-#else
- mcontext_t mc = uc->uc_mcontext;
- pc = mc_pc(mc);
- mc->fs.fpu_mxcsr = 0x1F80;
- *(unsigned short *)&mc->fs.fpu_fsw &= ~0xFF;
-#endif /* DARWIN_MODERN_MCONTEXT */
-#elif defined(__DARWIN__) && defined(__ppc__)
- mcontext_t mc = uc->uc_mcontext;
- pc = mc->ss.srr0;
- mc->ss.srr0 += 4;
- mc->fs.fpscr = 0x80|0x40|0x10;
-#elif defined(__FreeBSD__) && defined(__x86_64__)
- mcontext_t *mc = &uc->uc_mcontext;
- struct savefpu *savefpu = (struct savefpu*)&mc->mc_fpstate;
- struct envxmm *envxmm = &savefpu->sv_env;
- pc = mc_pc(mc);
- envxmm->en_mxcsr = 0x1F80;
- envxmm->en_sw &= ~0xFF;
-#elif defined(__FreeBSD__) && defined(__i386__)
- mcontext_t *mc = &uc->uc_mcontext;
- union savefpu *savefpu = (union savefpu*)&mc->mc_fpstate;
- pc = mc_pc(mc);
- if (mc->mc_fpformat == _MC_FPFMT_XMM) {
- struct envxmm *envxmm = &savefpu->sv_xmm.sv_env;
- envxmm->en_mxcsr = 0x1F80;
- envxmm->en_sw &= ~0xFF;
- } else {
- struct env87 *env87 = &savefpu->sv_87.sv_env;
- env87->en_sw &= ~0xFF;
- }
-#elif defined(__NetBSD__) && defined(__x86_64__)
- mcontext_t *mc = &uc->uc_mcontext;
- struct fxsave64 *fxsave = (struct fxsave64 *)&mc->__fpregs;
- pc = mc_pc(mc);
- fxsave->fx_mxcsr = 0x1F80;
- fxsave->fx_fsw &= ~0xFF;
-#elif defined(__NetBSD__) && defined(__i386__)
- mcontext_t *mc = &uc->uc_mcontext;
- pc = mc_pc(mc);
- if (uc->uc_flags & _UC_FXSAVE) {
- struct envxmm *envxmm = (struct envxmm *)&mc->__fpregs;
- envxmm->en_mxcsr = 0x1F80;
- envxmm->en_sw &= ~0xFF;
- } else {
- struct env87 *env87 = (struct env87 *)&mc->__fpregs;
- env87->en_sw &= ~0xFF;
- }
-#elif defined(__OpenBSD__) && defined(__x86_64__)
- struct fxsave64 *fxsave = uc->sc_fpstate;
- pc = mc_pc(uc);
- fxsave->fx_mxcsr = 0x1F80;
- fxsave->fx_fsw &= ~0xFF;
-#elif defined(__sun__) && defined(__x86_64__)
- mcontext_t *mc = &uc->uc_mcontext;
- struct fpchip_state *fpstate = &mc->fpregs.fp_reg_set.fpchip_state;
- pc = mc_pc(mc);
- fpstate->mxcsr = 0x1F80;
- fpstate->sw &= ~0xFF;
-#endif
-#if 0
- {
- char buf[64];
- snprintf(buf, sizeof buf, "%s: FPE at %p\r\n", __FUNCTION__, (void*)pc);
- write(2, buf, strlen(buf));
- }
-#endif
- set_current_fp_exception(pc);
-}
-
-static void erts_thread_catch_fp_exceptions(void)
-{
- struct sigaction act;
- memset(&act, 0, sizeof act);
- act.sa_sigaction = fpe_sig_action;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGFPE, &act, NULL);
- unmask_fpe();
-}
-
-#else /* !((__linux__ && (__i386__ || __x86_64__ || __powerpc__)) || (__DARWIN__ && (__i386__ || __x86_64__ || __ppc__))) */
-
-static void fpe_sig_handler(int sig)
-{
- set_current_fp_exception(1); /* XXX: convert to sigaction so we can get the trap PC */
-}
-
-static void erts_thread_catch_fp_exceptions(void)
-{
- sys_sigset(SIGFPE, fpe_sig_handler);
- unmask_fpe();
-}
-
-#endif /* (__linux__ && (__i386__ || __x86_64__ || __powerpc__)) || (__DARWIN__ && (__i386__ || __x86_64__ || __ppc__))) */
-
-/* once-only initialisation early in the main thread */
-void erts_sys_init_float(void)
-{
- erts_init_fp_exception();
- erts_thread_catch_fp_exceptions();
- erts_printf_block_fpe = erts_sys_block_fpe;
- erts_printf_unblock_fpe = erts_sys_unblock_fpe;
-}
-
-#endif /* NO_FPE_SIGNALS */
-
-void erts_thread_init_float(void)
-{
-#ifdef ERTS_SMP
- /* This allows Erlang schedulers to leave Erlang-process context
- and still have working FP exceptions. XXX: is this needed? */
- erts_thread_init_fp_exception();
-#endif
-
-#ifndef NO_FPE_SIGNALS
- /* NOTE:
- * erts_thread_disable_fpe() is called in all threads at
- * creation. We at least need to call unmask_fpe()
- */
-#if defined(__DARWIN__) || defined(__FreeBSD__)
- /* Darwin (7.9.0) does not appear to propagate FP exception settings
- to a new thread from its parent. So if we want FP exceptions, we
- must manually re-enable them in each new thread.
- FreeBSD 6.1 appears to suffer from a similar issue. */
- erts_thread_catch_fp_exceptions();
-#else
- unmask_fpe();
-#endif
-
-#endif
-}
-
-void erts_thread_disable_fpe(void)
-{
-#if !defined(NO_FPE_SIGNALS)
- (void)mask_fpe();
-#endif
-}
-
-#if !defined(NO_FPE_SIGNALS)
-int erts_sys_block_fpe(void)
-{
- return mask_fpe();
-}
-
-void erts_sys_unblock_fpe(int unmasked)
-{
- unmask_fpe_conditional(unmasked);
-}
-#endif
-
-/* The following check is incorporated from the Vee machine */
-
-#define ISDIGIT(d) ((d) >= '0' && (d) <= '9')
-
-/*
- ** Convert a double to ascii format 0.dddde[+|-]ddd
- ** return number of characters converted or -1 if error.
- **
- ** These two functions should maybe use localeconv() to pick up
- ** the current radix character, but since it is uncertain how
- ** expensive such a system call is, and since no-one has heard
- ** of other radix characters than '.' and ',' an ad-hoc
- ** low execution time solution is used instead.
- */
-
-int
-sys_double_to_chars_ext(double fp, char *buffer, size_t buffer_size, size_t decimals)
-{
- char *s = buffer;
-
- if (erts_snprintf(buffer, buffer_size, "%.*e", decimals, fp) >= buffer_size)
- return -1;
- /* Search upto decimal point */
- if (*s == '+' || *s == '-') s++;
- while (ISDIGIT(*s)) s++;
- if (*s == ',') *s++ = '.'; /* Replace ',' with '.' */
- /* Scan to end of string */
- while (*s) s++;
- return s-buffer; /* i.e strlen(buffer) */
-}
-
-/* Float conversion */
-
-int
-sys_chars_to_double(char* buf, double* fp)
-{
-#ifndef NO_FPE_SIGNALS
- volatile unsigned long *fpexnp = erts_get_current_fp_exception();
-#endif
- char *s = buf, *t, *dp;
-
- /* Robert says that something like this is what he really wanted:
- * (The [.,] radix test is NOT what Robert wanted - it was added later)
- *
- * 7 == sscanf(Tbuf, "%[+-]%[0-9][.,]%[0-9]%[eE]%[+-]%[0-9]%s", ....);
- * if (*s2 == 0 || *s3 == 0 || *s4 == 0 || *s6 == 0 || *s7)
- * break;
- */
-
- /* Scan string to check syntax. */
- if (*s == '+' || *s == '-') s++;
- if (!ISDIGIT(*s)) /* Leading digits. */
- return -1;
- while (ISDIGIT(*s)) s++;
- if (*s != '.' && *s != ',') /* Decimal part. */
- return -1;
- dp = s++; /* Remember decimal point pos just in case */
- if (!ISDIGIT(*s))
- return -1;
- while (ISDIGIT(*s)) s++;
- if (*s == 'e' || *s == 'E') {
- /* There is an exponent. */
- s++;
- if (*s == '+' || *s == '-') s++;
- if (!ISDIGIT(*s))
- return -1;
- while (ISDIGIT(*s)) s++;
- }
- if (*s) /* That should be it */
- return -1;
-
-#ifdef NO_FPE_SIGNALS
- errno = 0;
-#endif
- __ERTS_FP_CHECK_INIT(fpexnp);
- *fp = strtod(buf, &t);
- __ERTS_FP_ERROR_THOROUGH(fpexnp, *fp, return -1);
- if (t != s) { /* Whole string not scanned */
- /* Try again with other radix char */
- *dp = (*dp == '.') ? ',' : '.';
- errno = 0;
- __ERTS_FP_CHECK_INIT(fpexnp);
- *fp = strtod(buf, &t);
- __ERTS_FP_ERROR_THOROUGH(fpexnp, *fp, return -1);
- }
-
-#ifdef NO_FPE_SIGNALS
- if (errno == ERANGE) {
- if (*fp == HUGE_VAL || *fp == -HUGE_VAL) {
- /* overflow, should give error */
- return -1;
- } else if (t == s && *fp == 0.0) {
- /* This should give 0.0 - OTP-7178 */
- errno = 0;
-
- } else if (*fp == 0.0) {
- return -1;
- }
- }
-#endif
- return 0;
-}
-
-int
-matherr(struct exception *exc)
-{
-#if !defined(NO_FPE_SIGNALS)
- volatile unsigned long *fpexnp = erts_get_current_fp_exception();
- if (fpexnp != NULL)
- *fpexnp = (unsigned long)__builtin_return_address(0);
-#endif
- return 1;
-}
View Lorry Controller Status