+++ /dev/null
-/* -----------------------------------------------------------------------
- ffi.c - Copyright (c) 1998 Geoffrey Keating
-
- PowerPC Foreign Function Interface
-
- Darwin ABI support (c) 2001 John Hornkvist
- AIX ABI support (c) 2002 Free Software Foundation, Inc.
-
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- ``Software''), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
-
- The above copyright notice and this permission notice shall be included
- in all copies or substantial portions of the Software.
-
- THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
- OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- OTHER DEALINGS IN THE SOFTWARE.
- ----------------------------------------------------------------------- */
-#include <ffi.h>
-#include <ffi_common.h>
-
-#include <stdlib.h>
-
-extern void ffi_closure_ASM(void);
-
-enum {
- /* The assembly depends on these exact flags. */
- FLAG_RETURNS_NOTHING = 1 << (31-30), /* These go in cr7 */
- FLAG_RETURNS_FP = 1 << (31-29),
- FLAG_RETURNS_64BITS = 1 << (31-28),
-
- FLAG_ARG_NEEDS_COPY = 1 << (31- 7),
- FLAG_FP_ARGUMENTS = 1 << (31- 6), /* cr1.eq; specified by ABI */
- FLAG_4_GPR_ARGUMENTS = 1 << (31- 5),
- FLAG_RETVAL_REFERENCE = 1 << (31- 4)
-};
-
-/* About the DARWIN ABI. */
-enum {
- NUM_GPR_ARG_REGISTERS = 8,
- NUM_FPR_ARG_REGISTERS = 13
-};
-enum { ASM_NEEDS_REGISTERS = 4 };
-
-/* ffi_prep_args is called by the assembly routine once stack space
- has been allocated for the function's arguments.
-
- The stack layout we want looks like this:
-
- | Return address from ffi_call_DARWIN | higher addresses
- |--------------------------------------------|
- | Previous backchain pointer 4 | stack pointer here
- |--------------------------------------------|<+ <<< on entry to
- | Saved r28-r31 4*4 | | ffi_call_DARWIN
- |--------------------------------------------| |
- | Parameters (at least 8*4=32) | |
- |--------------------------------------------| |
- | Space for GPR2 4 | |
- |--------------------------------------------| | stack |
- | Reserved 2*4 | | grows |
- |--------------------------------------------| | down V
- | Space for callee's LR 4 | |
- |--------------------------------------------| | lower addresses
- | Saved CR 4 | |
- |--------------------------------------------| | stack pointer here
- | Current backchain pointer 4 |-/ during
- |--------------------------------------------| <<< ffi_call_DARWIN
-
- */
-
-/*@-exportheader@*/
-void ffi_prep_args(extended_cif *ecif, unsigned *const stack)
-/*@=exportheader@*/
-{
- const unsigned bytes = ecif->cif->bytes;
- const unsigned flags = ecif->cif->flags;
-
- /* 'stacktop' points at the previous backchain pointer. */
- unsigned *const stacktop = stack + (ecif->cif->bytes / sizeof(unsigned));
-
- /* 'fpr_base' points at the space for fpr1, and grows upwards as
- we use FPR registers. */
- double *fpr_base = (double*) (stacktop - ASM_NEEDS_REGISTERS) - NUM_FPR_ARG_REGISTERS;
- int fparg_count = 0;
-
-
- /* 'next_arg' grows up as we put parameters in it. */
- unsigned *next_arg = stack + 6; // 6 reserved posistions.
-
- int i=ecif->cif->nargs;
- double double_tmp;
- float float_tmp;
- void **p_argv = ecif->avalue;
- unsigned gprvalue;
- ffi_type** ptr = ecif->cif->arg_types;
-
- /* Check that everything starts aligned properly. */
- FFI_ASSERT(((unsigned)(char *)stack & 0xF) == 0);
- FFI_ASSERT(((unsigned)(char *)stacktop & 0xF) == 0);
- FFI_ASSERT((bytes & 0xF) == 0);
-
- /* Deal with return values that are actually pass-by-reference. */
- // Rule:
- // Return values are referenced by r3, so r4 is the first parameter.
- if (flags & FLAG_RETVAL_REFERENCE)
- *next_arg++ = (unsigned)(char *)ecif->rvalue;
-
- /* Now for the arguments. */
- for (;
- i > 0;
- i--, ptr++, p_argv++)
- {
- switch ((*ptr)->type)
- {
- /* If a floating-point parameter appears before all of the general-
- purpose registers are filled, the corresponding GPRs that match
- the size of the floating-point parameter are skipped. */
- case FFI_TYPE_FLOAT:
- double_tmp = *(float *)*p_argv;
- if (fparg_count >= NUM_FPR_ARG_REGISTERS)
- *(double *)next_arg = double_tmp;
- else
- *fpr_base++ = double_tmp;
- next_arg++;
- fparg_count++;
- FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
- break;
- case FFI_TYPE_DOUBLE:
- double_tmp = *(double *)*p_argv;
- if (fparg_count >= NUM_FPR_ARG_REGISTERS)
- *(double *)next_arg = double_tmp;
- else
- *fpr_base++ = double_tmp;
- next_arg += 2;
- fparg_count++;
- FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
- break;
-
- case FFI_TYPE_UINT64:
- case FFI_TYPE_SINT64:
- *(long long *)next_arg = *(long long *)*p_argv;
- next_arg+=2;
- break;
- case FFI_TYPE_UINT8:
- gprvalue = *(unsigned char *)*p_argv;
- goto putgpr;
- case FFI_TYPE_SINT8:
- gprvalue = *(signed char *)*p_argv;
- goto putgpr;
- case FFI_TYPE_UINT16:
- gprvalue = *(unsigned short *)*p_argv;
- goto putgpr;
- case FFI_TYPE_SINT16:
- gprvalue = *(signed short *)*p_argv;
- goto putgpr;
-
- case FFI_TYPE_STRUCT:
-
-#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
- case FFI_TYPE_LONGDOUBLE:
-#endif
-
- memcpy((char*)next_arg, (char *)*p_argv, (*ptr)->size);
- next_arg+=(((((*ptr)->size) + 3) & ~0x3)/4);
- break;
-
- case FFI_TYPE_INT:
- case FFI_TYPE_UINT32:
- case FFI_TYPE_SINT32:
- case FFI_TYPE_POINTER:
- gprvalue = *(unsigned *)*p_argv;
- putgpr:
- *next_arg++ = gprvalue;
- break;
- default:
- break;
- }
- }
-
- /* Check that we didn't overrun the stack... */
- //FFI_ASSERT(copy_space >= (char *)next_arg);
- //FFI_ASSERT(gpr_base <= stacktop - ASM_NEEDS_REGISTERS);
- //FFI_ASSERT((unsigned *)fpr_base
- // <= stacktop - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS);
- //FFI_ASSERT(flags & FLAG_4_GPR_ARGUMENTS || intarg_count <= 4);
-}
-
-/* Perform machine dependent cif processing */
-ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
-{
- /* All this is for the DARWIN ABI. */
- int i;
- ffi_type **ptr;
- unsigned bytes;
- int fparg_count = 0, intarg_count = 0;
- unsigned flags = 0;
- unsigned struct_copy_size = 0;
-
- /* All the machine-independent calculation of cif->bytes will be wrong.
- Redo the calculation for DARWIN. */
-
- /* Space for the frame pointer, callee's LR, CR, etc, and for
- the asm's temp regs. */
-
- bytes = (6 + ASM_NEEDS_REGISTERS) * sizeof(long);
-
- /* Return value handling. The rules are as follows:
- - 32-bit (or less) integer values are returned in gpr3;
- - Structures of size <= 4 bytes also returned in gpr3;
- - 64-bit integer values and structures between 5 and 8 bytes are returned
- in gpr3 and gpr4;
- - Single/double FP values are returned in fpr1;
- - Long double FP (if not equivalent to double) values are returned in
- fpr1 and fpr2;
- - Larger structures values are allocated space and a pointer is passed
- as the first argument. */
- switch (cif->rtype->type)
- {
-#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
- case FFI_TYPE_LONGDOUBLE:
-#endif
- /* Fall through. */
- case FFI_TYPE_DOUBLE:
- flags |= FLAG_RETURNS_64BITS;
- /* Fall through. */
- case FFI_TYPE_FLOAT:
- flags |= FLAG_RETURNS_FP;
- break;
-
- case FFI_TYPE_UINT64:
- case FFI_TYPE_SINT64:
- flags |= FLAG_RETURNS_64BITS;
- break;
-
- case FFI_TYPE_STRUCT:
- flags |= FLAG_RETVAL_REFERENCE;
- flags |= FLAG_RETURNS_NOTHING;
- intarg_count++;
- break;
- case FFI_TYPE_VOID:
- flags |= FLAG_RETURNS_NOTHING;
- break;
-
- default:
- /* Returns 32-bit integer, or similar. Nothing to do here. */
- break;
- }
-
- /* The first NUM_GPR_ARG_REGISTERS words of integer arguments, and the
- first NUM_FPR_ARG_REGISTERS fp arguments, go in registers; the rest
- goes on the stack. Structures and long doubles (if not equivalent
- to double) are passed as a pointer to a copy of the structure.
- Stuff on the stack needs to keep proper alignment. */
- for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
- {
- switch ((*ptr)->type)
- {
- case FFI_TYPE_FLOAT:
- case FFI_TYPE_DOUBLE:
- fparg_count++;
- /* If this FP arg is going on the stack, it must be
- 8-byte-aligned. */
- if (fparg_count > NUM_FPR_ARG_REGISTERS
- && intarg_count%2 != 0)
- intarg_count++;
- break;
-
- case FFI_TYPE_UINT64:
- case FFI_TYPE_SINT64:
- /* 'long long' arguments are passed as two words, but
- either both words must fit in registers or both go
- on the stack. If they go on the stack, they must
- be 8-byte-aligned. */
- if (intarg_count == NUM_GPR_ARG_REGISTERS-1
- || intarg_count >= NUM_GPR_ARG_REGISTERS && intarg_count%2 != 0)
- intarg_count++;
- intarg_count += 2;
- break;
-
- case FFI_TYPE_STRUCT:
-#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
- case FFI_TYPE_LONGDOUBLE:
-#endif
- intarg_count+=(((*ptr)->size + 3) & ~0x3)/4;
- break;
-
- default:
- /* Everything else is passed as a 4-byte word in a GPR, either
- the object itself or a pointer to it. */
- intarg_count++;
- break;
- }
- }
-
- if (fparg_count != 0)
- flags |= FLAG_FP_ARGUMENTS;
- if (struct_copy_size != 0)
- flags |= FLAG_ARG_NEEDS_COPY;
-
- /* Space for the FPR registers, if needed. */
- if (fparg_count != 0)
- bytes += NUM_FPR_ARG_REGISTERS * sizeof(double);
-
- /* Stack space. */
- if ((intarg_count + 2 * fparg_count) > NUM_GPR_ARG_REGISTERS)
- bytes += (intarg_count + 2 * fparg_count) * sizeof(long);
- else
- bytes += NUM_GPR_ARG_REGISTERS * sizeof(long);
-
- /* The stack space allocated needs to be a multiple of 16 bytes. */
- bytes = (bytes + 15) & ~0xF;
-
- cif->flags = flags;
- cif->bytes = bytes;
-
- return FFI_OK;
-}
-
-/*@-declundef@*/
-/*@-exportheader@*/
-extern void ffi_call_AIX(/*@out@*/ extended_cif *,
- unsigned, unsigned,
- /*@out@*/ unsigned *,
- void (*fn)(),
- void (*fn2)());
-extern void ffi_call_DARWIN(/*@out@*/ extended_cif *,
- unsigned, unsigned,
- /*@out@*/ unsigned *,
- void (*fn)(),
- void (*fn2)());
-/*@=declundef@*/
-/*@=exportheader@*/
-
-void ffi_call(/*@dependent@*/ ffi_cif *cif,
- void (*fn)(),
- /*@out@*/ void *rvalue,
- /*@dependent@*/ void **avalue)
-{
- extended_cif ecif;
-
- ecif.cif = cif;
- ecif.avalue = avalue;
-
- /* If the return value is a struct and we don't have a return */
- /* value address then we need to make one */
-
- if ((rvalue == NULL) &&
- (cif->rtype->type == FFI_TYPE_STRUCT))
- {
- /*@-sysunrecog@*/
- ecif.rvalue = alloca(cif->rtype->size);
- /*@=sysunrecog@*/
- }
- else
- ecif.rvalue = rvalue;
-
- switch (cif->abi)
- {
- case FFI_AIX:
- /*@-usedef@*/
- ffi_call_AIX(&ecif, -cif->bytes,
- cif->flags, ecif.rvalue, fn, ffi_prep_args);
- /*@=usedef@*/
- break;
- case FFI_DARWIN:
- /*@-usedef@*/
- ffi_call_DARWIN(&ecif, -cif->bytes,
- cif->flags, ecif.rvalue, fn, ffi_prep_args);
- /*@=usedef@*/
- break;
- default:
- FFI_ASSERT(0);
- break;
- }
-}
-
-static void flush_icache(char *);
-static void flush_range(char *, int);
-
-/* The layout of a function descriptor. A C function pointer really */
-/* points to one of these. */
-
-typedef struct aix_fd_struct {
- void *code_pointer;
- void *toc;
-} aix_fd;
-
-/* here I'd like to add the stack frame layout we use in darwin_closure.S
- * and aix_clsoure.S
- *
-/* SP previous -> +---------------------------------------+ <--- child frame
- | back chain to caller 4 |
- +---------------------------------------+ 4
- | saved CR 4 |
- +---------------------------------------+ 8
- | saved LR 4 |
- +---------------------------------------+ 12
- | reserved for compilers 4 |
- +---------------------------------------+ 16
- | reserved for binders 4 |
- +---------------------------------------+ 20
- | saved TOC pointer 4 |
- +---------------------------------------+ 24
- | always reserved 8*4=32 (previous GPRs)|
- | according to the linkage convention |
- | from AIX |
- +---------------------------------------+ 56
- | our FPR area 13*8=104 |
- | f1 |
- | . |
- | f13 |
- +---------------------------------------+ 160
- | result area 8 |
- +---------------------------------------+ 168
- | alignement to the next multiple of 16 |
-SP current --> +---------------------------------------+ 176 <- parent frame
- | back chain to caller 4 |
- +---------------------------------------+ 180
- | saved CR 4 |
- +---------------------------------------+ 184
- | saved LR 4 |
- +---------------------------------------+ 188
- | reserved for compilers 4 |
- +---------------------------------------+ 192
- | reserved for binders 4 |
- +---------------------------------------+ 196
- | saved TOC pointer 4 |
- +---------------------------------------+ 200
- | always reserved 8*4=32 we store our |
- | GPRs here |
- | r3 |
- | . |
- | r10 |
- +---------------------------------------+ 232
- | PST area, overflow part |
- +---------------------------------------+ xxx
- | ???? |
- +---------------------------------------+ xxx
-
-*/
-ffi_status
-ffi_prep_closure (ffi_closure* closure,
- ffi_cif* cif,
- void (*fun)(ffi_cif*, void*, void**, void*),
- void *user_data)
-{
- unsigned int *tramp;
- struct ffi_aix_trampoline_struct *tramp_aix;
- aix_fd *fd;
-
- switch (cif->abi)
- {
- case FFI_DARWIN:
-
- FFI_ASSERT (cif->abi == FFI_DARWIN);
-
- tramp = (unsigned int *) &closure->tramp[0];
- tramp[0] = 0x7c0802a6; /* mflr r0 */
- tramp[1] = 0x4800000d; /* bl 10 <trampoline_initial+0x10> */
- tramp[4] = 0x7d6802a6; /* mflr r11 */
- tramp[5] = 0x818b0000; /* lwz r12,0(r11) /* function address */
- tramp[6] = 0x7c0803a6; /* mtlr r0 */
- tramp[7] = 0x7d8903a6; /* mtctr r12 */
- tramp[8] = 0x816b0004; /* lwz r11,4(r11) /* static chain */
- tramp[9] = 0x4e800420; /* bctr */
- *(void **) &tramp[2] = (void *)ffi_closure_ASM; /* function */
- *(void **) &tramp[3] = (void *)closure; /* context */
-
- closure->cif = cif;
- closure->fun = fun;
- closure->user_data = user_data;
-
- /* Flush the icache. Only necessary on Darwin */
- flush_range(&closure->tramp[0],FFI_TRAMPOLINE_SIZE);
-
- break;
-
- case FFI_AIX:
-
- tramp_aix = (struct ffi_aix_trampoline_struct *) (closure->tramp);
- fd = (aix_fd *)(void *)ffi_closure_ASM;
-
- FFI_ASSERT (cif->abi == FFI_AIX);
-
- tramp_aix->code_pointer = fd->code_pointer;
- tramp_aix->toc = fd->toc;
- tramp_aix->static_chain = closure;
- closure->cif = cif;
- closure->fun = fun;
- closure->user_data = user_data;
-
- default:
-
- FFI_ASSERT(0);
- break;
- }
- return FFI_OK;
-}
-
-static void
-flush_icache(char *addr)
-{
-#ifndef _AIX
- __asm__ volatile (
- "dcbf 0,%0;"
- "sync;"
- "icbi 0,%0;"
- "sync;"
- "isync;"
- : : "r"(addr) : "memory");
-#endif
-}
-
-static void
-flush_range(char * addr1, int size)
-{
-#define MIN_LINE_SIZE 32
- int i;
- for (i = 0; i < size; i += MIN_LINE_SIZE)
- flush_icache(addr1+i);
- flush_icache(addr1+size-1);
-}
-
-int ffi_closure_helper_DARWIN (ffi_closure*, void*, unsigned long*,
- unsigned long*, unsigned long*);
-
-/* Basically the trampoline invokes ffi_closure_ASM, and on
- * entry, r11 holds the address of the closure.
- * After storing the registers that could possibly contain
- * parameters to be passed into the stack frame and setting
- * up space for a return value, ffi_closure_ASM invokes the
- * following helper function to do most of the work
- */
-
-int
-ffi_closure_helper_DARWIN (ffi_closure* closure, void * rvalue,
- unsigned long * pgr, unsigned long * pfr,
- unsigned long * pst)
-{
- /* rvalue is the pointer to space for return value in closure assembly */
- /* pgr is the pointer to where r3-r10 are stored in ffi_closure_ASM */
- /* pfr is the pointer to where f1-f13 are stored in ffi_closure_ASM */
- /* pst is the pointer to outgoing parameter stack in original caller */
-
- void ** avalue;
- ffi_type ** arg_types;
- long i, avn;
- long nf; /* number of floating registers already used */
- long ng; /* number of general registers already used */
- ffi_cif * cif;
- double temp;
-
- cif = closure->cif;
- avalue = alloca(cif->nargs * sizeof(void *));
-
- nf = 0;
- ng = 0;
-
- /* Copy the caller's structure return value address so that the closure
- returns the data directly to the caller. */
- if (cif->rtype->type == FFI_TYPE_STRUCT)
- {
- rvalue = (void *)pgr;
- ng++;
- pgr++;
- }
-
- i = 0;
- avn = cif->nargs;
- arg_types = cif->arg_types;
-
- /* Grab the addresses of the arguments from the stack frame. */
- while (i < avn)
- {
- switch (arg_types[i]->type)
- {
- case FFI_TYPE_SINT8:
- case FFI_TYPE_UINT8:
- /* there are 8 gpr registers used to pass values */
- if (ng < 8) {
- avalue[i] = (((char *)pgr)+3);
- ng++;
- pgr++;
- } else {
- avalue[i] = (((char *)pst)+3);
- pst++;
- }
- break;
-
- case FFI_TYPE_SINT16:
- case FFI_TYPE_UINT16:
- /* there are 8 gpr registers used to pass values */
- if (ng < 8) {
- avalue[i] = (((char *)pgr)+2);
- ng++;
- pgr++;
- } else {
- avalue[i] = (((char *)pst)+2);
- pst++;
- }
- break;
-
- case FFI_TYPE_SINT32:
- case FFI_TYPE_UINT32:
- case FFI_TYPE_POINTER:
- case FFI_TYPE_STRUCT:
- /* there are 8 gpr registers used to pass values */
- if (ng < 8) {
- avalue[i] = pgr;
- ng++;
- pgr++;
- } else {
- avalue[i] = pst;
- pst++;
- }
- break;
-
- case FFI_TYPE_SINT64:
- case FFI_TYPE_UINT64:
- /* long long ints are passed in two gpr's if available or in
- * the pst, one place is a bit odd, when a long long passes
- * the boundary between gpr and pst area we have to increment
- * the pst by one.
- */
- if (ng < 7) {
- avalue[i] = pgr;
- ng+=2;
- pgr+=2;
- } else if (ng == 7) {
- avalue[i] = pgr;
- ng++;
- pgr++;
- pst++;
- } else {
- avalue[i] = pst;
- pst+=2;
- }
- break;
-
- case FFI_TYPE_FLOAT:
- /* a float value consumes a GPR
- *
- * there are 13 64bit floating point registers
- */
-
- if ((ng > 7) && (nf < 13)) {
- pst++;
- }
- if (nf < 13) {
- temp = *(double*)pfr;
- *(float*)pfr = (float)temp;
- avalue[i] = pfr;
- nf++;
- pfr+=2;
- ng++;
- pgr++;
-
- } else {
- avalue[i] = pst;
- nf++;
- pst++;
- }
- break;
-
- case FFI_TYPE_DOUBLE:
- /* a double value consumes two GPRs
- *
- * there are 13 64bit floating point registers
- */
-
- if ((ng == 7) && (nf < 13)) {
- pst++; /* if only one gpr is left the double steals it */
- } else if ((ng > 7) && (nf < 13)) {
- pst+=2; /* a double consumes two GPRs in Darwin/AIX */
- }
- if (nf < 13) {
- avalue[i] = pfr;
- nf++;
- pfr+=2;
- ng+=2;
- pgr+=2;
-
- } else {
- avalue[i] = pst;
- nf++;
- pst+=2;
- }
- break;
-
- default:
- FFI_ASSERT(0);
-
- }
-
- i++;
- }
-
- (closure->fun) (cif, rvalue, avalue, closure->user_data);
-
- /* Tell ffi_closure_ASM to perform return type promotions. */
- return cif->rtype->type;
-
-}
projects / msp430-gcc.git / blobdiff