diff options
Diffstat (limited to 'gcc-4.8/libffi/src/powerpc/ffi_sysv.c')
| -rw-r--r-- | gcc-4.8/libffi/src/powerpc/ffi_sysv.c | 931 |
1 files changed, 931 insertions, 0 deletions
diff --git a/gcc-4.8/libffi/src/powerpc/ffi_sysv.c b/gcc-4.8/libffi/src/powerpc/ffi_sysv.c new file mode 100644 index 000000000..fbe85fe91 --- /dev/null +++ b/gcc-4.8/libffi/src/powerpc/ffi_sysv.c @@ -0,0 +1,931 @@ +/* ----------------------------------------------------------------------- + ffi_sysv.c - Copyright (C) 2013 IBM + Copyright (C) 2011 Anthony Green + Copyright (C) 2011 Kyle Moffett + Copyright (C) 2008 Red Hat, Inc + Copyright (C) 2007, 2008 Free Software Foundation, Inc + Copyright (c) 1998 Geoffrey Keating + + PowerPC Foreign Function Interface + + 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" + +#ifndef POWERPC64 +#include "ffi_common.h" +#include "ffi_powerpc.h" + + +/* About the SYSV ABI. */ +#define ASM_NEEDS_REGISTERS 4 +#define NUM_GPR_ARG_REGISTERS 8 +#define NUM_FPR_ARG_REGISTERS 8 + + +#if HAVE_LONG_DOUBLE_VARIANT && FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE +/* Adjust size of ffi_type_longdouble. */ +void FFI_HIDDEN +ffi_prep_types_sysv (ffi_abi abi) +{ + if ((abi & (FFI_SYSV | FFI_SYSV_LONG_DOUBLE_128)) == FFI_SYSV) + { + ffi_type_longdouble.size = 8; + ffi_type_longdouble.alignment = 8; + } + else + { + ffi_type_longdouble.size = 16; + ffi_type_longdouble.alignment = 16; + } +} +#endif + +/* Transform long double, double and float to other types as per abi. */ +static int +translate_float (int abi, int type) +{ +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + if (type == FFI_TYPE_LONGDOUBLE + && (abi & FFI_SYSV_LONG_DOUBLE_128) == 0) + type = FFI_TYPE_DOUBLE; +#endif + if ((abi & FFI_SYSV_SOFT_FLOAT) != 0) + { + if (type == FFI_TYPE_FLOAT) + type = FFI_TYPE_UINT32; + else if (type == FFI_TYPE_DOUBLE) + type = FFI_TYPE_UINT64; +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + else if (type == FFI_TYPE_LONGDOUBLE) + type = FFI_TYPE_UINT128; + } + else if ((abi & FFI_SYSV_IBM_LONG_DOUBLE) == 0) + { + if (type == FFI_TYPE_LONGDOUBLE) + type = FFI_TYPE_STRUCT; +#endif + } + return type; +} + +/* Perform machine dependent cif processing */ +static ffi_status +ffi_prep_cif_sysv_core (ffi_cif *cif) +{ + ffi_type **ptr; + unsigned bytes; + unsigned i, fparg_count = 0, intarg_count = 0; + unsigned flags = cif->flags; + unsigned struct_copy_size = 0; + unsigned type = cif->rtype->type; + unsigned size = cif->rtype->size; + + /* The machine-independent calculation of cif->bytes doesn't work + for us. Redo the calculation. */ + + /* Space for the frame pointer, callee's LR, and the asm's temp regs. */ + bytes = (2 + ASM_NEEDS_REGISTERS) * sizeof (int); + + /* Space for the GPR registers. */ + bytes += NUM_GPR_ARG_REGISTERS * sizeof (int); + + /* Return value handling. The rules for SYSV 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; + - Larger structures are allocated space and a pointer is passed as + the first argument. + - Single/double FP values are returned in fpr1; + - long doubles (if not equivalent to double) are returned in + fpr1,fpr2 for Linux and as for large structs for SysV. */ + + type = translate_float (cif->abi, type); + + switch (type) + { +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + flags |= FLAG_RETURNS_128BITS; + /* Fall through. */ +#endif + case FFI_TYPE_DOUBLE: + flags |= FLAG_RETURNS_64BITS; + /* Fall through. */ + case FFI_TYPE_FLOAT: + flags |= FLAG_RETURNS_FP; +#ifdef __NO_FPRS__ + return FFI_BAD_ABI; +#endif + break; + + case FFI_TYPE_UINT128: + flags |= FLAG_RETURNS_128BITS; + /* Fall through. */ + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: + flags |= FLAG_RETURNS_64BITS; + break; + + case FFI_TYPE_STRUCT: + /* The final SYSV ABI says that structures smaller or equal 8 bytes + are returned in r3/r4. A draft ABI used by linux instead + returns them in memory. */ + if ((cif->abi & FFI_SYSV_STRUCT_RET) != 0 && size <= 8) + { + flags |= FLAG_RETURNS_SMST; + break; + } + intarg_count++; + flags |= FLAG_RETVAL_REFERENCE; + /* Fall through. */ + 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++) + { + unsigned short typenum = (*ptr)->type; + + typenum = translate_float (cif->abi, typenum); + + switch (typenum) + { +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + fparg_count++; + /* Fall thru */ +#endif + 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 >= NUM_GPR_ARG_REGISTERS + && intarg_count % 2 != 0) + intarg_count++; +#ifdef __NO_FPRS__ + return FFI_BAD_ABI; +#endif + break; + + case FFI_TYPE_FLOAT: + fparg_count++; +#ifdef __NO_FPRS__ + return FFI_BAD_ABI; +#endif + break; + + case FFI_TYPE_UINT128: + /* A long double in FFI_LINUX_SOFT_FLOAT can use only a set + of four consecutive gprs. If we do not have enough, we + have to adjust the intarg_count value. */ + if (intarg_count >= NUM_GPR_ARG_REGISTERS - 3 + && intarg_count < NUM_GPR_ARG_REGISTERS) + intarg_count = NUM_GPR_ARG_REGISTERS; + intarg_count += 4; + 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. + + Also, only certain register pairs can be used for + passing long long int -- specifically (r3,r4), (r5,r6), + (r7,r8), (r9,r10). */ + if (intarg_count == NUM_GPR_ARG_REGISTERS-1 + || intarg_count % 2 != 0) + intarg_count++; + intarg_count += 2; + break; + + case FFI_TYPE_STRUCT: + /* We must allocate space for a copy of these to enforce + pass-by-value. Pad the space up to a multiple of 16 + bytes (the maximum alignment required for anything under + the SYSV ABI). */ + struct_copy_size += ((*ptr)->size + 15) & ~0xF; + /* Fall through (allocate space for the pointer). */ + + case FFI_TYPE_POINTER: + case FFI_TYPE_INT: + case FFI_TYPE_UINT32: + case FFI_TYPE_SINT32: + case FFI_TYPE_UINT16: + case FFI_TYPE_SINT16: + case FFI_TYPE_UINT8: + case FFI_TYPE_SINT8: + /* Everything else is passed as a 4-byte word in a GPR, either + the object itself or a pointer to it. */ + intarg_count++; + break; + + default: + FFI_ASSERT (0); + } + } + + if (fparg_count != 0) + flags |= FLAG_FP_ARGUMENTS; + if (intarg_count > 4) + flags |= FLAG_4_GPR_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 > NUM_GPR_ARG_REGISTERS) + bytes += (intarg_count - NUM_GPR_ARG_REGISTERS) * sizeof (int); + if (fparg_count > NUM_FPR_ARG_REGISTERS) + bytes += (fparg_count - NUM_FPR_ARG_REGISTERS) * sizeof (double); + + /* The stack space allocated needs to be a multiple of 16 bytes. */ + bytes = (bytes + 15) & ~0xF; + + /* Add in the space for the copied structures. */ + bytes += struct_copy_size; + + cif->flags = flags; + cif->bytes = bytes; + + return FFI_OK; +} + +ffi_status FFI_HIDDEN +ffi_prep_cif_sysv (ffi_cif *cif) +{ + if ((cif->abi & FFI_SYSV) == 0) + { + /* This call is from old code. Translate to new ABI values. */ + cif->flags |= FLAG_COMPAT; + switch (cif->abi) + { + default: + return FFI_BAD_ABI; + + case FFI_COMPAT_SYSV: + cif->abi = FFI_SYSV | FFI_SYSV_STRUCT_RET | FFI_SYSV_LONG_DOUBLE_128; + break; + + case FFI_COMPAT_GCC_SYSV: + cif->abi = FFI_SYSV | FFI_SYSV_LONG_DOUBLE_128; + break; + + case FFI_COMPAT_LINUX: + cif->abi = (FFI_SYSV | FFI_SYSV_IBM_LONG_DOUBLE + | FFI_SYSV_LONG_DOUBLE_128); + break; + + case FFI_COMPAT_LINUX_SOFT_FLOAT: + cif->abi = (FFI_SYSV | FFI_SYSV_SOFT_FLOAT | FFI_SYSV_IBM_LONG_DOUBLE + | FFI_SYSV_LONG_DOUBLE_128); + break; + } + } + return ffi_prep_cif_sysv_core (cif); +} + +/* ffi_prep_args_SYSV 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_SYSV 4bytes | higher addresses + |--------------------------------------------| + | Previous backchain pointer 4 | stack pointer here + |--------------------------------------------|<+ <<< on entry to + | Saved r28-r31 4*4 | | ffi_call_SYSV + |--------------------------------------------| | + | GPR registers r3-r10 8*4 | | ffi_call_SYSV + |--------------------------------------------| | + | FPR registers f1-f8 (optional) 8*8 | | + |--------------------------------------------| | stack | + | Space for copied structures | | grows | + |--------------------------------------------| | down V + | Parameters that didn't fit in registers | | + |--------------------------------------------| | lower addresses + | Space for callee's LR 4 | | + |--------------------------------------------| | stack pointer here + | Current backchain pointer 4 |-/ during + |--------------------------------------------| <<< ffi_call_SYSV + +*/ + +void FFI_HIDDEN +ffi_prep_args_SYSV (extended_cif *ecif, unsigned *const stack) +{ + const unsigned bytes = ecif->cif->bytes; + const unsigned flags = ecif->cif->flags; + + typedef union + { + char *c; + unsigned *u; + long long *ll; + float *f; + double *d; + } valp; + + /* 'stacktop' points at the previous backchain pointer. */ + valp stacktop; + + /* 'gpr_base' points at the space for gpr3, and grows upwards as + we use GPR registers. */ + valp gpr_base; + int intarg_count; + +#ifndef __NO_FPRS__ + /* 'fpr_base' points at the space for fpr1, and grows upwards as + we use FPR registers. */ + valp fpr_base; + int fparg_count; +#endif + + /* 'copy_space' grows down as we put structures in it. It should + stay 16-byte aligned. */ + valp copy_space; + + /* 'next_arg' grows up as we put parameters in it. */ + valp next_arg; + + int i; + ffi_type **ptr; +#ifndef __NO_FPRS__ + double double_tmp; +#endif + union + { + void **v; + char **c; + signed char **sc; + unsigned char **uc; + signed short **ss; + unsigned short **us; + unsigned int **ui; + long long **ll; + float **f; + double **d; + } p_argv; + size_t struct_copy_size; + unsigned gprvalue; + + stacktop.c = (char *) stack + bytes; + gpr_base.u = stacktop.u - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS; + intarg_count = 0; +#ifndef __NO_FPRS__ + fpr_base.d = gpr_base.d - NUM_FPR_ARG_REGISTERS; + fparg_count = 0; + copy_space.c = ((flags & FLAG_FP_ARGUMENTS) ? fpr_base.c : gpr_base.c); +#else + copy_space.c = gpr_base.c; +#endif + next_arg.u = stack + 2; + + /* Check that everything starts aligned properly. */ + FFI_ASSERT (((unsigned long) (char *) stack & 0xF) == 0); + FFI_ASSERT (((unsigned long) copy_space.c & 0xF) == 0); + FFI_ASSERT (((unsigned long) stacktop.c & 0xF) == 0); + FFI_ASSERT ((bytes & 0xF) == 0); + FFI_ASSERT (copy_space.c >= next_arg.c); + + /* Deal with return values that are actually pass-by-reference. */ + if (flags & FLAG_RETVAL_REFERENCE) + { + *gpr_base.u++ = (unsigned long) (char *) ecif->rvalue; + intarg_count++; + } + + /* Now for the arguments. */ + p_argv.v = ecif->avalue; + for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs; + i > 0; + i--, ptr++, p_argv.v++) + { + unsigned int typenum = (*ptr)->type; + + typenum = translate_float (ecif->cif->abi, typenum); + + /* Now test the translated value */ + switch (typenum) + { +#ifndef __NO_FPRS__ +# if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + double_tmp = (*p_argv.d)[0]; + + if (fparg_count >= NUM_FPR_ARG_REGISTERS - 1) + { + if (intarg_count >= NUM_GPR_ARG_REGISTERS + && intarg_count % 2 != 0) + { + intarg_count++; + next_arg.u++; + } + *next_arg.d = double_tmp; + next_arg.u += 2; + double_tmp = (*p_argv.d)[1]; + *next_arg.d = double_tmp; + next_arg.u += 2; + } + else + { + *fpr_base.d++ = double_tmp; + double_tmp = (*p_argv.d)[1]; + *fpr_base.d++ = double_tmp; + } + + fparg_count += 2; + FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); + break; +# endif + case FFI_TYPE_DOUBLE: + double_tmp = **p_argv.d; + + if (fparg_count >= NUM_FPR_ARG_REGISTERS) + { + if (intarg_count >= NUM_GPR_ARG_REGISTERS + && intarg_count % 2 != 0) + { + intarg_count++; + next_arg.u++; + } + *next_arg.d = double_tmp; + next_arg.u += 2; + } + else + *fpr_base.d++ = double_tmp; + fparg_count++; + FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); + break; + + case FFI_TYPE_FLOAT: + double_tmp = **p_argv.f; + if (fparg_count >= NUM_FPR_ARG_REGISTERS) + { + *next_arg.f = (float) double_tmp; + next_arg.u += 1; + intarg_count++; + } + else + *fpr_base.d++ = double_tmp; + fparg_count++; + FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); + break; +#endif /* have FPRs */ + + case FFI_TYPE_UINT128: + /* The soft float ABI for long doubles works like this, a long double + is passed in four consecutive GPRs if available. A maximum of 2 + long doubles can be passed in gprs. If we do not have 4 GPRs + left, the long double is passed on the stack, 4-byte aligned. */ + { + unsigned int int_tmp; + unsigned int ii; + if (intarg_count >= NUM_GPR_ARG_REGISTERS - 3) + { + if (intarg_count < NUM_GPR_ARG_REGISTERS) + intarg_count = NUM_GPR_ARG_REGISTERS; + for (ii = 0; ii < 4; ii++) + { + int_tmp = (*p_argv.ui)[ii]; + *next_arg.u++ = int_tmp; + } + } + else + { + for (ii = 0; ii < 4; ii++) + { + int_tmp = (*p_argv.ui)[ii]; + *gpr_base.u++ = int_tmp; + } + } + intarg_count += 4; + break; + } + + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: + if (intarg_count == NUM_GPR_ARG_REGISTERS-1) + intarg_count++; + if (intarg_count >= NUM_GPR_ARG_REGISTERS) + { + if (intarg_count % 2 != 0) + { + intarg_count++; + next_arg.u++; + } + *next_arg.ll = **p_argv.ll; + next_arg.u += 2; + } + else + { + /* The abi states only certain register pairs can be + used for passing long long int specifically (r3,r4), + (r5,r6), (r7,r8), (r9,r10). If next arg is long long + but not correct starting register of pair then skip + until the proper starting register. */ + if (intarg_count % 2 != 0) + { + intarg_count ++; + gpr_base.u++; + } + *gpr_base.ll++ = **p_argv.ll; + } + intarg_count += 2; + break; + + case FFI_TYPE_STRUCT: + struct_copy_size = ((*ptr)->size + 15) & ~0xF; + copy_space.c -= struct_copy_size; + memcpy (copy_space.c, *p_argv.c, (*ptr)->size); + + gprvalue = (unsigned long) copy_space.c; + + FFI_ASSERT (copy_space.c > next_arg.c); + FFI_ASSERT (flags & FLAG_ARG_NEEDS_COPY); + goto putgpr; + + case FFI_TYPE_UINT8: + gprvalue = **p_argv.uc; + goto putgpr; + case FFI_TYPE_SINT8: + gprvalue = **p_argv.sc; + goto putgpr; + case FFI_TYPE_UINT16: + gprvalue = **p_argv.us; + goto putgpr; + case FFI_TYPE_SINT16: + gprvalue = **p_argv.ss; + goto putgpr; + + case FFI_TYPE_INT: + case FFI_TYPE_UINT32: + case FFI_TYPE_SINT32: + case FFI_TYPE_POINTER: + + gprvalue = **p_argv.ui; + + putgpr: + if (intarg_count >= NUM_GPR_ARG_REGISTERS) + *next_arg.u++ = gprvalue; + else + *gpr_base.u++ = gprvalue; + intarg_count++; + break; + } + } + + /* Check that we didn't overrun the stack... */ + FFI_ASSERT (copy_space.c >= next_arg.c); + FFI_ASSERT (gpr_base.u <= stacktop.u - ASM_NEEDS_REGISTERS); + /* The assert below is testing that the number of integer arguments agrees + with the number found in ffi_prep_cif_machdep(). However, intarg_count + is incremented whenever we place an FP arg on the stack, so account for + that before our assert test. */ +#ifndef __NO_FPRS__ + if (fparg_count > NUM_FPR_ARG_REGISTERS) + intarg_count -= fparg_count - NUM_FPR_ARG_REGISTERS; + FFI_ASSERT (fpr_base.u + <= stacktop.u - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS); +#endif + FFI_ASSERT (flags & FLAG_4_GPR_ARGUMENTS || intarg_count <= 4); +} + +#define MIN_CACHE_LINE_SIZE 8 + +static void +flush_icache (char *wraddr, char *xaddr, int size) +{ + int i; + for (i = 0; i < size; i += MIN_CACHE_LINE_SIZE) + __asm__ volatile ("icbi 0,%0;" "dcbf 0,%1;" + : : "r" (xaddr + i), "r" (wraddr + i) : "memory"); + __asm__ volatile ("icbi 0,%0;" "dcbf 0,%1;" "sync;" "isync;" + : : "r"(xaddr + size - 1), "r"(wraddr + size - 1) + : "memory"); +} + +ffi_status FFI_HIDDEN +ffi_prep_closure_loc_sysv (ffi_closure *closure, + ffi_cif *cif, + void (*fun) (ffi_cif *, void *, void **, void *), + void *user_data, + void *codeloc) +{ + unsigned int *tramp; + + if (cif->abi < FFI_SYSV || cif->abi >= FFI_LAST_ABI) + return FFI_BAD_ABI; + + 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] = 0x7c0803a6; /* mtlr r0 */ + tramp[6] = 0x800b0000; /* lwz r0,0(r11) */ + tramp[7] = 0x816b0004; /* lwz r11,4(r11) */ + tramp[8] = 0x7c0903a6; /* mtctr r0 */ + tramp[9] = 0x4e800420; /* bctr */ + *(void **) &tramp[2] = (void *) ffi_closure_SYSV; /* function */ + *(void **) &tramp[3] = codeloc; /* context */ + + /* Flush the icache. */ + flush_icache ((char *)tramp, (char *)codeloc, FFI_TRAMPOLINE_SIZE); + + closure->cif = cif; + closure->fun = fun; + closure->user_data = user_data; + + return FFI_OK; +} + +/* Basically the trampoline invokes ffi_closure_SYSV, 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_SYSV invokes the + following helper function to do most of the work. */ + +int +ffi_closure_helper_SYSV (ffi_closure *closure, void *rvalue, + unsigned long *pgr, ffi_dblfl *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_SYSV */ + /* pfr is the pointer to where f1-f8 are stored in ffi_closure_SYSV */ + /* pst is the pointer to outgoing parameter stack in original caller */ + + void ** avalue; + ffi_type ** arg_types; + long i, avn; +#ifndef __NO_FPRS__ + long nf = 0; /* number of floating registers already used */ +#endif + long ng = 0; /* number of general registers already used */ + + ffi_cif *cif = closure->cif; + unsigned size = cif->rtype->size; + unsigned short rtypenum = cif->rtype->type; + + avalue = alloca (cif->nargs * sizeof (void *)); + + /* First translate for softfloat/nonlinux */ + rtypenum = translate_float (cif->abi, rtypenum); + + /* Copy the caller's structure return value address so that the closure + returns the data directly to the caller. + For FFI_SYSV the result is passed in r3/r4 if the struct size is less + or equal 8 bytes. */ + if (rtypenum == FFI_TYPE_STRUCT + && !((cif->abi & FFI_SYSV_STRUCT_RET) != 0 && size <= 8)) + { + 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) { + unsigned short typenum = arg_types[i]->type; + + /* We may need to handle some values depending on ABI. */ + typenum = translate_float (cif->abi, typenum); + + switch (typenum) + { +#ifndef __NO_FPRS__ + case FFI_TYPE_FLOAT: + /* Unfortunately float values are stored as doubles + in the ffi_closure_SYSV code (since we don't check + the type in that routine). */ + if (nf < NUM_FPR_ARG_REGISTERS) + { + /* FIXME? here we are really changing the values + stored in the original calling routines outgoing + parameter stack. This is probably a really + naughty thing to do but... */ + double temp = pfr->d; + pfr->f = (float) temp; + avalue[i] = pfr; + nf++; + pfr++; + } + else + { + avalue[i] = pst; + pst += 1; + } + break; + + case FFI_TYPE_DOUBLE: + if (nf < NUM_FPR_ARG_REGISTERS) + { + avalue[i] = pfr; + nf++; + pfr++; + } + else + { + if (((long) pst) & 4) + pst++; + avalue[i] = pst; + pst += 2; + } + break; + +# if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + if (nf < NUM_FPR_ARG_REGISTERS - 1) + { + avalue[i] = pfr; + pfr += 2; + nf += 2; + } + else + { + if (((long) pst) & 4) + pst++; + avalue[i] = pst; + pst += 4; + nf = 8; + } + break; +# endif +#endif + + case FFI_TYPE_UINT128: + /* Test if for the whole long double, 4 gprs are available. + otherwise the stuff ends up on the stack. */ + if (ng < NUM_GPR_ARG_REGISTERS - 3) + { + avalue[i] = pgr; + pgr += 4; + ng += 4; + } + else + { + avalue[i] = pst; + pst += 4; + ng = 8+4; + } + break; + + case FFI_TYPE_SINT8: + case FFI_TYPE_UINT8: +#ifndef __LITTLE_ENDIAN__ + if (ng < NUM_GPR_ARG_REGISTERS) + { + avalue[i] = (char *) pgr + 3; + ng++; + pgr++; + } + else + { + avalue[i] = (char *) pst + 3; + pst++; + } + break; +#endif + + case FFI_TYPE_SINT16: + case FFI_TYPE_UINT16: +#ifndef __LITTLE_ENDIAN__ + if (ng < NUM_GPR_ARG_REGISTERS) + { + avalue[i] = (char *) pgr + 2; + ng++; + pgr++; + } + else + { + avalue[i] = (char *) pst + 2; + pst++; + } + break; +#endif + + case FFI_TYPE_SINT32: + case FFI_TYPE_UINT32: + case FFI_TYPE_POINTER: + if (ng < NUM_GPR_ARG_REGISTERS) + { + avalue[i] = pgr; + ng++; + pgr++; + } + else + { + avalue[i] = pst; + pst++; + } + break; + + case FFI_TYPE_STRUCT: + /* Structs are passed by reference. The address will appear in a + gpr if it is one of the first 8 arguments. */ + if (ng < NUM_GPR_ARG_REGISTERS) + { + avalue[i] = (void *) *pgr; + ng++; + pgr++; + } + else + { + avalue[i] = (void *) *pst; + pst++; + } + break; + + case FFI_TYPE_SINT64: + case FFI_TYPE_UINT64: + /* Passing long long ints are complex, they must + be passed in suitable register pairs such as + (r3,r4) or (r5,r6) or (r6,r7), or (r7,r8) or (r9,r10) + and if the entire pair aren't available then the outgoing + parameter stack is used for both but an alignment of 8 + must will be kept. So we must either look in pgr + or pst to find the correct address for this type + of parameter. */ + if (ng < NUM_GPR_ARG_REGISTERS - 1) + { + if (ng & 1) + { + /* skip r4, r6, r8 as starting points */ + ng++; + pgr++; + } + avalue[i] = pgr; + ng += 2; + pgr += 2; + } + else + { + if (((long) pst) & 4) + pst++; + avalue[i] = pst; + pst += 2; + ng = NUM_GPR_ARG_REGISTERS; + } + break; + + default: + FFI_ASSERT (0); + } + + i++; + } + + (closure->fun) (cif, rvalue, avalue, closure->user_data); + + /* Tell ffi_closure_SYSV how to perform return type promotions. + Because the FFI_SYSV ABI returns the structures <= 8 bytes in + r3/r4 we have to tell ffi_closure_SYSV how to treat them. We + combine the base type FFI_SYSV_TYPE_SMALL_STRUCT with the size of + the struct less one. We never have a struct with size zero. + See the comment in ffitarget.h about ordering. */ + if (rtypenum == FFI_TYPE_STRUCT + && (cif->abi & FFI_SYSV_STRUCT_RET) != 0 && size <= 8) + return FFI_SYSV_TYPE_SMALL_STRUCT - 1 + size; + return rtypenum; +} +#endif |