341 lines
12 KiB
C
341 lines
12 KiB
C
/*
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* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
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* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*/
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#include "private/gc_priv.h"
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#if !defined(PLATFORM_MACH_DEP) && !defined(SN_TARGET_PSP2)
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#include <stdio.h>
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#ifdef AMIGA
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# ifndef __GNUC__
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# include <dos.h>
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# else
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# include <machine/reg.h>
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# endif
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#endif
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#if defined(MACOS) && defined(__MWERKS__)
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#if defined(POWERPC)
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# define NONVOLATILE_GPR_COUNT 19
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struct ppc_registers {
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unsigned long gprs[NONVOLATILE_GPR_COUNT]; /* R13-R31 */
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};
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typedef struct ppc_registers ppc_registers;
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# if defined(CPPCHECK)
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void getRegisters(ppc_registers* regs);
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# else
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asm static void getRegisters(register ppc_registers* regs)
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{
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stmw r13,regs->gprs /* save R13-R31 */
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blr
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}
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# endif
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static void PushMacRegisters(void)
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{
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ppc_registers regs;
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int i;
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getRegisters(®s);
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for (i = 0; i < NONVOLATILE_GPR_COUNT; i++)
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GC_push_one(regs.gprs[i]);
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}
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#else /* M68K */
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asm static void PushMacRegisters(void)
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{
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sub.w #4,sp /* reserve space for one parameter */
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move.l a2,(sp)
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jsr GC_push_one
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move.l a3,(sp)
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jsr GC_push_one
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move.l a4,(sp)
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jsr GC_push_one
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# if !__option(a6frames)
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/* <pcb> perhaps a6 should be pushed if stack frames are not being used */
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move.l a6,(sp)
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jsr GC_push_one
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# endif
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/* skip a5 (globals), a6 (frame pointer), and a7 (stack pointer) */
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move.l d2,(sp)
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jsr GC_push_one
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move.l d3,(sp)
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jsr GC_push_one
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move.l d4,(sp)
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jsr GC_push_one
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move.l d5,(sp)
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jsr GC_push_one
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move.l d6,(sp)
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jsr GC_push_one
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move.l d7,(sp)
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jsr GC_push_one
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add.w #4,sp /* fix stack */
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rts
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}
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#endif /* M68K */
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#endif /* MACOS && __MWERKS__ */
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# if defined(SPARC) || defined(IA64)
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/* Value returned from register flushing routine; either sp (SPARC) */
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/* or ar.bsp (IA64). */
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GC_INNER ptr_t GC_save_regs_ret_val = NULL;
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# endif
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/* Routine to mark from registers that are preserved by the C compiler. */
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/* This must be ported to every new architecture. It is not optional, */
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/* and should not be used on platforms that are either UNIX-like, or */
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/* require thread support. */
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#undef HAVE_PUSH_REGS
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#if defined(USE_ASM_PUSH_REGS)
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# define HAVE_PUSH_REGS
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#else /* No asm implementation */
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# ifdef STACK_NOT_SCANNED
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void GC_push_regs(void)
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{
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/* empty */
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}
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# define HAVE_PUSH_REGS
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# elif defined(M68K) && defined(AMIGA)
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/* This function is not static because it could also be */
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/* erroneously defined in .S file, so this error would be caught */
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/* by the linker. */
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void GC_push_regs(void)
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{
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/* AMIGA - could be replaced by generic code */
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/* a0, a1, d0 and d1 are caller save */
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# ifdef __GNUC__
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asm("subq.w &0x4,%sp"); /* allocate word on top of stack */
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asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %a6,(%sp)"); asm("jsr _GC_push_one");
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/* Skip frame pointer and stack pointer */
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asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one");
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asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one");
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asm("addq.w &0x4,%sp"); /* put stack back where it was */
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# else /* !__GNUC__ */
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GC_push_one(getreg(REG_A2));
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GC_push_one(getreg(REG_A3));
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# ifndef __SASC
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/* Can probably be changed to #if 0 -Kjetil M. (a4=globals) */
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GC_push_one(getreg(REG_A4));
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# endif
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GC_push_one(getreg(REG_A5));
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GC_push_one(getreg(REG_A6));
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/* Skip stack pointer */
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GC_push_one(getreg(REG_D2));
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GC_push_one(getreg(REG_D3));
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GC_push_one(getreg(REG_D4));
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GC_push_one(getreg(REG_D5));
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GC_push_one(getreg(REG_D6));
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GC_push_one(getreg(REG_D7));
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# endif /* !__GNUC__ */
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}
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# define HAVE_PUSH_REGS
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# elif defined(MACOS)
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# if defined(M68K) && defined(THINK_C) && !defined(CPPCHECK)
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# define PushMacReg(reg) \
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move.l reg,(sp) \
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jsr GC_push_one
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void GC_push_regs(void)
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{
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asm {
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sub.w #4,sp ; reserve space for one parameter.
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PushMacReg(a2);
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PushMacReg(a3);
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PushMacReg(a4);
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; skip a5 (globals), a6 (frame pointer), and a7 (stack pointer)
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PushMacReg(d2);
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PushMacReg(d3);
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PushMacReg(d4);
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PushMacReg(d5);
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PushMacReg(d6);
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PushMacReg(d7);
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add.w #4,sp ; fix stack.
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}
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}
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# define HAVE_PUSH_REGS
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# undef PushMacReg
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# elif defined(__MWERKS__)
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void GC_push_regs(void)
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{
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PushMacRegisters();
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}
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# define HAVE_PUSH_REGS
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# endif /* __MWERKS__ */
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# endif /* MACOS */
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#endif /* !USE_ASM_PUSH_REGS */
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#if defined(HAVE_PUSH_REGS) && defined(THREADS)
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# error GC_push_regs cannot be used with threads
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/* Would fail for GC_do_blocking. There are probably other safety */
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/* issues. */
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# undef HAVE_PUSH_REGS
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#endif
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#if !defined(HAVE_PUSH_REGS) && defined(UNIX_LIKE)
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# include <signal.h>
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# ifndef NO_GETCONTEXT
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# if defined(DARWIN) \
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&& (MAC_OS_X_VERSION_MAX_ALLOWED >= 1060 /*MAC_OS_X_VERSION_10_6*/)
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# include <sys/ucontext.h>
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# else
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# include <ucontext.h>
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# endif /* !DARWIN */
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# ifdef GETCONTEXT_FPU_EXCMASK_BUG
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# include <fenv.h>
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# endif
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# endif
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#endif /* !HAVE_PUSH_REGS */
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/* Ensure that either registers are pushed, or callee-save registers */
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/* are somewhere on the stack, and then call fn(arg, ctxt). */
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/* ctxt is either a pointer to a ucontext_t we generated, or NULL. */
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GC_ATTR_NO_SANITIZE_ADDR
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GC_INNER void GC_with_callee_saves_pushed(void (*fn)(ptr_t, void *),
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volatile ptr_t arg)
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{
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volatile int dummy;
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void * volatile context = 0;
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# if defined(HAVE_PUSH_REGS)
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GC_push_regs();
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# else
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# if defined(UNIX_LIKE) && !defined(NO_GETCONTEXT)
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/* Older versions of Darwin seem to lack getcontext(). */
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/* ARM and MIPS Linux often doesn't support a real */
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/* getcontext(). */
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static signed char getcontext_works = 0; /* (-1) - broken, 1 - works */
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ucontext_t ctxt;
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# ifdef GETCONTEXT_FPU_EXCMASK_BUG
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/* Workaround a bug (clearing the FPU exception mask) in */
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/* getcontext on Linux/x86_64. */
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# ifdef X86_64
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/* We manipulate FPU control word here just not to force the */
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/* client application to use -lm linker option. */
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unsigned short old_fcw;
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# if defined(CPPCHECK)
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GC_noop1((word)&old_fcw);
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# endif
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__asm__ __volatile__ ("fstcw %0" : "=m" (*&old_fcw));
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# else
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int except_mask = fegetexcept();
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# endif
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# endif
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if (getcontext_works >= 0) {
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if (getcontext(&ctxt) < 0) {
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WARN("getcontext failed:"
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" using another register retrieval method...\n", 0);
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/* getcontext() is broken, do not try again. */
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/* E.g., to workaround a bug in Docker ubuntu_32bit. */
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} else {
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context = &ctxt;
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}
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if (EXPECT(0 == getcontext_works, FALSE))
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getcontext_works = context != NULL ? 1 : -1;
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}
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# ifdef GETCONTEXT_FPU_EXCMASK_BUG
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# ifdef X86_64
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__asm__ __volatile__ ("fldcw %0" : : "m" (*&old_fcw));
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{
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unsigned mxcsr;
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/* And now correct the exception mask in SSE MXCSR. */
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__asm__ __volatile__ ("stmxcsr %0" : "=m" (*&mxcsr));
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mxcsr = (mxcsr & ~(FE_ALL_EXCEPT << 7)) |
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((old_fcw & FE_ALL_EXCEPT) << 7);
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__asm__ __volatile__ ("ldmxcsr %0" : : "m" (*&mxcsr));
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}
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# else /* !X86_64 */
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if (feenableexcept(except_mask) < 0)
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ABORT("feenableexcept failed");
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# endif
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# endif /* GETCONTEXT_FPU_EXCMASK_BUG */
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# if defined(SPARC) || defined(IA64)
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/* On a register window machine, we need to save register */
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/* contents on the stack for this to work. This may already be */
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/* subsumed by the getcontext() call. */
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GC_save_regs_ret_val = GC_save_regs_in_stack();
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# endif
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if (NULL == context) /* getcontext failed */
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# endif /* !NO_GETCONTEXT */
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{
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# if defined(HAVE_BUILTIN_UNWIND_INIT)
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/* This was suggested by Richard Henderson as the way to */
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/* force callee-save registers and register windows onto */
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/* the stack. */
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__builtin_unwind_init();
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# elif defined(NO_CRT) && defined(MSWIN32)
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CONTEXT ctx;
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RtlCaptureContext(&ctx);
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# else
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/* Generic code */
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/* The idea is due to Parag Patel at HP. */
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/* We're not sure whether he would like */
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/* to be acknowledged for it or not. */
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jmp_buf regs;
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word * i = (word *)®s;
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ptr_t lim = (ptr_t)(®s) + sizeof(regs);
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/* Setjmp doesn't always clear all of the buffer. */
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/* That tends to preserve garbage. Clear it. */
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for (; (word)i < (word)lim; i++) {
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*i = 0;
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}
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# if defined(MSWIN32) || defined(MSWINCE) || defined(UTS4) \
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|| defined(OS2) || defined(CX_UX) || defined(__CC_ARM) \
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|| defined(LINUX) || defined(EWS4800) || defined(RTEMS)
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(void) setjmp(regs);
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# else
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(void) _setjmp(regs);
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/* We don't want to mess with signals. According to */
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/* SUSV3, setjmp() may or may not save signal mask. */
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/* _setjmp won't, but is less portable. */
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# endif
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# endif /* !HAVE_BUILTIN_UNWIND_INIT */
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}
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# endif /* !HAVE_PUSH_REGS */
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/* FIXME: context here is sometimes just zero. At the moment the */
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/* callees don't really need it. */
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fn(arg, context);
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/* Strongly discourage the compiler from treating the above */
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/* as a tail-call, since that would pop the register */
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/* contents before we get a chance to look at them. */
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GC_noop1((word)(&dummy));
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}
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#endif /* !SN_TARGET_ORBIS && !SN_TARGET_PSP2 */
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