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x64sysvabicc.c
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x64sysvabicc.c
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/*
* x86ia32abicc.c
*
* Support for Call-outs and Call-backs from the Plugin on x86_64.
* Written by Eliot Miranda 12/14, Ryan Macnak 9/15
*
* Based on
* System V Application Binary Interface
* AMD64 Architecture Processor Supplement
* Draft Version 0.99.6
* here referred to as x64ABI
*/
/* null if compiled on other than x64, to get around gnu make bugs or
* misunderstandings on our part.
*/
#if x86_64|x64|__x86_64|__x86_64__
#if defined(_MSC_VER) || defined(__MINGW32__)
# include <Windows.h> /* for GetSystemInfo & VirtualAlloc */
# error Windows doesn't use the SystemV ABI
#elif __APPLE__ && __MACH__
# include <sys/mman.h> /* for mprotect */
# if OBJC_DEBUG /* define this to get debug info for struct objc_class et al */
# include <objc/objc.h>
# include <objc/objc-class.h>
struct objc_class *baz;
void setbaz(void *p) { baz = p; }
void *getbaz() { return baz; }
# endif
# include <unistd.h> /* for getpagesize/sysconf */
# include <stdlib.h> /* for valloc */
# include <sys/mman.h> /* for mprotect */
#else
# include <unistd.h> /* for getpagesize/sysconf */
# include <stdlib.h> /* for valloc */
# include <sys/mman.h> /* for mprotect */
#endif
#include <string.h> /* for memcpy et al */
#include <setjmp.h>
#include <stdio.h> /* for fprintf(stderr,...) */
#include "objAccess.h"
#include "vmCallback.h"
#include "sqAssert.h"
#include "ia32abi.h"
#if !defined(min)
# define min(a,b) ((a) < (b) ? (a) : (b))
#endif
#define NUM_REG_ARGS 6
#define NUM_DREG_ARGS 8
#ifdef SQUEAK_BUILTIN_PLUGIN
extern
#endif
struct VirtualMachine* interpreterProxy;
#if __GNUC__
# define setsp(sp) __asm__ volatile ("movq %0,%%rsp" : : "m"(sp))
# define getsp() ({ void *sp; __asm__ volatile ("movq %%rsp,%0" : "=r"(sp) : ); sp;})
#endif
#define STACK_ALIGN_BYTES 32 /* 32 if a 256-bit argument is passed; 16 otherwise */
#if !defined(setsp)
# define setsp(ignored) 0
#endif
#define RoundUpPowerOfTwo(value, modulus) \
(((value) + (modulus) - 1) & ~((modulus) - 1))
#define IsAlignedPowerOfTwo(value, modulus) \
(((value) & ((modulus) - 1)) == 0)
/*
* Call a foreign function that answers an integral result in %rax (and
* possibly %rdx?) according to x64-ish ABI rules.
*/
sqInt callIA32IntegralReturn(SIGNATURE) {
long (*f)(long rdi, long rsi, long rdx, long rcx, long r8, long r9,
double xmm0, double xmm1, double xmm2, double xmm3,
double xmm4, double xmm5, double xmm6, double xmm7);
long r;
#include "dax64business.h"
}
/*
* Call a foreign function that answers a single-precision floating-point
* result in %xmm0 according to x64-ish ABI rules.
*/
sqInt callIA32FloatReturn(SIGNATURE) {
float (*f)(long rdi, long rsi, long rdx, long rcx, long r8, long r9,
double xmm0, double xmm1, double xmm2, double xmm3,
double xmm4, double xmm5, double xmm6, double xmm7);
float r;
#include "dax64business.h"
}
/*
* Call a foreign function that answers a double-precision floating-point
* result in %xmm0 according to x64-ish ABI rules.
*/
sqInt callIA32DoubleReturn(SIGNATURE) {
double (*f)(long rdi, long rsi, long rdx, long rcx, long r8, long r9,
double xmm0, double xmm1, double xmm2, double xmm3,
double xmm4, double xmm5, double xmm6, double xmm7);
double r;
#include "dax64business.h"
}
/* Queueing order for callback returns. To ensure that callback returns occur
* in LIFO order we provide mostRecentCallbackContext which is tested by the
* return primitive primReturnFromContextThrough. Note that in the threaded VM
* this does not have to be thread-specific or locked since it is within the
* bounds of the ownVM/disownVM pair.
*/
static VMCallbackContext *mostRecentCallbackContext = 0;
VMCallbackContext *
getMostRecentCallbackContext() { return mostRecentCallbackContext; }
#define getMRCC() mostRecentCallbackContext
#define setMRCC(t) (mostRecentCallbackContext = (void *)(t))
/*
* Entry-point for call-back thunks. Args are the integer register args, the
* floating-point register arguments, the thunk address and stack pointer, where
* the stack pointer is pointing one word below the return address of the thunk's
* callee, 8 bytes below the thunk's first stacked argument. The stack is:
* callback stack arguments
* retpc (thunk) <--\
* address of retpc-/ <--\
* address of address of ret pc-/
* thunkp
* rsp->retpc (thunkEntry)
*
* This function's roles are to use setjmp/longjmp to save the call point
* and return to it, and to return any of the various values from the callback.
*
* To support x86-64, which when using the SysV ABI has 6 integer register arguments, and 8
* floating-point register arguments, the function takes 16 arguments, the 6 register args
* as longs, folowed by 8 floating-point arguments as doubles, followed by the thunkp and
* stackp passed on the stack. The register args get copied into a struct on the stack.
* A pointer to the struct is then passed as an element of the VMCallbackContext.
*/
long
thunkEntry(long a0, long a1, long a2, long a3, long a4, long a5,
double d0, double d1, double d2, double d3,
double d4, double d5, double d6, double d7,
void *thunkp, sqIntptr_t *stackp)
{
VMCallbackContext vmcc;
long returnType;
long intargs[6];
double fpargs[8];
intargs[0] = a0;
intargs[1] = a1;
intargs[2] = a2;
intargs[3] = a3;
intargs[4] = a4;
intargs[5] = a5;
fpargs[0] = d0;
fpargs[1] = d1;
fpargs[2] = d2;
fpargs[3] = d3;
fpargs[4] = d4;
fpargs[5] = d5;
fpargs[6] = d6;
fpargs[7] = d7;
if (interpreterProxy->ownVM(NULL /* unidentified thread */) < 0) {
fprintf(stderr,"Warning; callback failed to own the VM\n");
return -1;
}
if (!(returnType = setjmp(vmcc.trampoline))) {
vmcc.savedMostRecentCallbackContext = getMRCC();
setMRCC(&vmcc);
vmcc.thunkp = thunkp;
vmcc.stackp = stackp + 2; /* skip address of retpc & retpc (thunk) */
vmcc.intregargsp = intargs;
vmcc.floatregargsp = fpargs;
interpreterProxy->sendInvokeCallbackContext(&vmcc);
fprintf(stderr,"Warning; callback failed to invoke\n");
setMRCC(vmcc.savedMostRecentCallbackContext);
interpreterProxy->disownVM(DisownVMFromCallback);
return -1;
}
setMRCC(vmcc.savedMostRecentCallbackContext);
interpreterProxy->disownVM(DisownVMFromCallback);
switch (returnType) {
case retword:
case retword64:
return vmcc.rvs.valword;
case retdouble: {
double valflt64 = vmcc.rvs.valflt64;
#if _MSC_VER
_asm mov qword ptr valflt64, xmm0;
#elif __GNUC__ || __SUNPRO_C
__asm__("movq %0, %%xmm0" : : "m"(valflt64));
#else
# error need to load %xmm0 with vmcc.rvs.valflt64 on this compiler
#endif
return 0;
}
case retstruct: memcpy( (void *)(stackp[1]),
vmcc.rvs.valstruct.addr,
vmcc.rvs.valstruct.size);
return stackp[1];
}
fprintf(stderr,"Warning; invalid callback return type\n");
return 0;
}
/*
* Thunk allocation support. Since thunks must be executable and some OSs
* may not provide default execute permission on memory returned by malloc
* we must provide memory that is guaranteed to be executable. The abstraction
* is to answer an Alien that references an executable piece of memory that
* is some (possiby unitary) multiple of the pagesize.
*
* We assume the Smalltalk image code will manage subdividing the executable
* page amongst thunks so there is no need to free these pages, since the image
* will recycle parts of the page for reclaimed thunks.
*/
#if defined(_MSC_VER) || defined(__MINGW32__)
static unsigned long pagesize = 0;
#endif
void *
allocateExecutablePage(sqIntptr_t *size)
{
void *mem;
#if defined(_MSC_VER) || defined(__MINGW32__)
#if !defined(MEM_TOP_DOWN)
# define MEM_TOP_DOWN 0x100000
#endif
if (!pagesize) {
SYSTEM_INFO sysinf;
GetSystemInfo(&sysinf);
pagesize = sysinf.dwPageSize;
}
/* N.B. VirtualAlloc MEM_COMMIT initializes the memory returned to zero. */
mem = VirtualAlloc( 0,
pagesize,
MEM_COMMIT | MEM_TOP_DOWN,
PAGE_EXECUTE_READWRITE);
if (mem)
*size = pagesize;
#else
# if !defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE < 200112L
long pagesize = getpagesize();
# else
long pagesize = sysconf(_SC_PAGESIZE);
# endif
/* This is equivalent to valloc(pagesize) but at least on some versions of
* SELinux valloc fails to yield an wexecutable page, whereas this mmap
* call works everywhere we've tested so far. See
* http://lists.squeakfoundation.org/pipermail/vm-dev/2018-October/029102.html
*/
if (!(mem = mmap(0, pagesize, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0)))
return 0;
// MAP_ANON should zero out the allocated page, but explicitly doing it shouldn't hurt
memset(mem, 0, pagesize);
*size = pagesize;
#endif
return mem;
}
#endif /* x86_64|x64|__x86_64|__x86_64__ */