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304 lines
5.7 KiB
C
304 lines
5.7 KiB
C
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#if defined(__i386__) || defined(__x86_64__)
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#include <cpuid.h>
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#endif
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#ifdef __linux__
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#include <syscall.h>
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#endif
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#include "config.h"
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#include "runtime.h"
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#include "arch.h"
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#include "array.h"
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int32
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runtime_atoi(const byte *p, intgo len)
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{
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int32 n;
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n = 0;
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while(len > 0 && '0' <= *p && *p <= '9') {
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n = n*10 + *p++ - '0';
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len--;
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}
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return n;
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}
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// A random number from the GNU/Linux auxv array.
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static uint32 randomNumber;
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// Set the random number from Go code.
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void
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setRandomNumber(uint32 r)
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{
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randomNumber = r;
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}
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#if defined(__i386__) || defined(__x86_64__) || defined (__s390__) || defined (__s390x__)
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// When cputicks is just asm instructions, skip the split stack
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// prologue for speed.
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int64 runtime_cputicks(void) __attribute__((no_split_stack));
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#endif
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// Whether the processor supports SSE2.
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#if defined (__i386__)
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static _Bool hasSSE2;
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// Force appropriate CPU level so that we can call the lfence/mfence
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// builtins.
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#pragma GCC push_options
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#pragma GCC target("sse2")
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#elif defined(__x86_64__)
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#define hasSSE2 true
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#endif
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#if defined(__i386__) || defined(__x86_64__)
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// Whether to use lfence, as opposed to mfence.
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// Set based on cpuid.
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static _Bool lfenceBeforeRdtsc;
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#endif // defined(__i386__) || defined(__x86_64__)
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int64
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runtime_cputicks(void)
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{
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#if defined(__i386__) || defined(__x86_64__)
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if (hasSSE2) {
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if (lfenceBeforeRdtsc) {
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__builtin_ia32_lfence();
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} else {
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__builtin_ia32_mfence();
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}
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}
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return __builtin_ia32_rdtsc();
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#elif defined (__s390__) || defined (__s390x__)
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uint64 clock = 0;
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/* stckf may not write the return variable in case of a clock error, so make
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it read-write to prevent that the initialisation is optimised out.
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Note: Targets below z9-109 will crash when executing store clock fast, i.e.
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we don't support Go for machines older than that. */
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asm volatile(".insn s,0xb27c0000,%0" /* stckf */ : "+Q" (clock) : : "cc" );
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return (int64)clock;
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#else
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// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
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// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
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// randomNumber provides better seeding of fastrand.
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return runtime_nanotime1() + randomNumber;
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#endif
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}
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#if defined(__i386__)
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#pragma GCC pop_options
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#endif
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void
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runtime_signalstack(byte *p, uintptr n)
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{
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stack_t st;
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st.ss_sp = p;
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st.ss_size = n;
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st.ss_flags = 0;
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if(p == nil)
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st.ss_flags = SS_DISABLE;
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if(sigaltstack(&st, nil) < 0)
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abort();
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}
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int32 go_open(char *, int32, int32)
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__asm__ (GOSYM_PREFIX "runtime.open");
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int32
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go_open(char *name, int32 mode, int32 perm)
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{
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return runtime_open(name, mode, perm);
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}
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int32 go_read(int32, void *, int32)
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__asm__ (GOSYM_PREFIX "runtime.read");
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int32
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go_read(int32 fd, void *p, int32 n)
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{
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ssize_t r = runtime_read(fd, p, n);
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if (r < 0)
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r = - errno;
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return (int32)r;
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}
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int32 go_write1(uintptr, void *, int32)
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__asm__ (GOSYM_PREFIX "runtime.write1");
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int32
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go_write1(uintptr fd, void *p, int32 n)
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{
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ssize_t r = runtime_write(fd, p, n);
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if (r < 0)
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r = - errno;
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return (int32)r;
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}
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int32 go_closefd(int32)
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__asm__ (GOSYM_PREFIX "runtime.closefd");
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int32
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go_closefd(int32 fd)
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{
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return runtime_close(fd);
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}
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intgo go_errno(void)
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__asm__ (GOSYM_PREFIX "runtime.errno");
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intgo
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go_errno()
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{
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return (intgo)errno;
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}
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uintptr getEnd(void)
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__asm__ (GOSYM_PREFIX "runtime.getEnd");
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uintptr
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getEnd()
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{
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#ifdef _AIX
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// mmap adresses range start at 0x30000000 on AIX for 32 bits processes
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uintptr end = 0x30000000U;
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#else
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uintptr end = 0;
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uintptr *pend;
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pend = &__go_end;
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if (pend != nil) {
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end = *pend;
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}
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#endif
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return end;
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}
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// Return an address that is before the read-only data section.
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// Unfortunately there is no standard symbol for this so we use a text
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// address.
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uintptr getText(void)
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__asm__ (GOSYM_PREFIX "runtime.getText");
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extern void main_main(void*)
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__asm__(GOSYM_PREFIX "main.main");
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uintptr
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getText(void)
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{
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return (uintptr)(const void *)(main_main);
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}
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// Return the end of the text segment, assumed to come after the
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// read-only data section.
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uintptr getEtext(void)
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__asm__ (GOSYM_PREFIX "runtime.getEtext");
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uintptr
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getEtext(void)
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{
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const void *p;
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p = __data_start;
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if (p == nil)
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p = __etext;
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if (p == nil)
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p = _etext;
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return (uintptr)(p);
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}
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// Return the start of the BSS section.
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uintptr getBSS(void)
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__asm__ (GOSYM_PREFIX "runtime.getBSS");
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uintptr
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getBSS(void)
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{
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const void *p;
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p = __edata;
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if (p == NULL)
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p = _edata;
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if (p == NULL)
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p = __bss_start;
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return (uintptr)(p);
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}
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// CPU-specific initialization.
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// Fetch CPUID info on x86.
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void
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runtime_cpuinit()
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{
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#if defined(__i386__) || defined(__x86_64__)
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unsigned int eax, ebx, ecx, edx;
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if (__get_cpuid(0, &eax, &ebx, &ecx, &edx)) {
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if (eax != 0
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&& ebx == 0x756E6547 // "Genu"
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&& edx == 0x49656E69 // "ineI"
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&& ecx == 0x6C65746E) { // "ntel"
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lfenceBeforeRdtsc = true;
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}
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}
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if (__get_cpuid(1, &eax, &ebx, &ecx, &edx)) {
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#if defined(__i386__)
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if ((edx & bit_SSE2) != 0) {
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hasSSE2 = true;
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}
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#endif
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}
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#if defined(HAVE_AS_X86_AES)
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setSupportAES(true);
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#endif
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#endif
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}
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// A publication barrier: a store/store barrier.
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void publicationBarrier(void)
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__asm__ (GOSYM_PREFIX "runtime.publicationBarrier");
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void
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publicationBarrier()
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{
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__atomic_thread_fence(__ATOMIC_RELEASE);
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}
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#ifdef __linux__
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/* Currently sbrk0 is only called on GNU/Linux. */
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uintptr sbrk0(void)
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__asm__ (GOSYM_PREFIX "runtime.sbrk0");
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uintptr
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sbrk0()
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{
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return syscall(SYS_brk, (uintptr)(0));
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}
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#endif /* __linux__ */
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