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Diffstat (limited to 'src/s390/ffi.c')
| -rw-r--r-- | src/s390/ffi.c | 780 |
1 files changed, 780 insertions, 0 deletions
diff --git a/src/s390/ffi.c b/src/s390/ffi.c new file mode 100644 index 0000000..ca2675b --- /dev/null +++ b/src/s390/ffi.c @@ -0,0 +1,780 @@ +/* ----------------------------------------------------------------------- + ffi.c - Copyright (c) 2000, 2007 Software AG + Copyright (c) 2008 Red Hat, Inc + + S390 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. + ----------------------------------------------------------------------- */ +/*====================================================================*/ +/* Includes */ +/* -------- */ +/*====================================================================*/ + +#include <ffi.h> +#include <ffi_common.h> + +#include <stdlib.h> +#include <stdio.h> + +/*====================== End of Includes =============================*/ + +/*====================================================================*/ +/* Defines */ +/* ------- */ +/*====================================================================*/ + +/* Maximum number of GPRs available for argument passing. */ +#define MAX_GPRARGS 5 + +/* Maximum number of FPRs available for argument passing. */ +#ifdef __s390x__ +#define MAX_FPRARGS 4 +#else +#define MAX_FPRARGS 2 +#endif + +/* Round to multiple of 16. */ +#define ROUND_SIZE(size) (((size) + 15) & ~15) + +/* If these values change, sysv.S must be adapted! */ +#define FFI390_RET_VOID 0 +#define FFI390_RET_STRUCT 1 +#define FFI390_RET_FLOAT 2 +#define FFI390_RET_DOUBLE 3 +#define FFI390_RET_INT32 4 +#define FFI390_RET_INT64 5 + +/*===================== End of Defines ===============================*/ + +/*====================================================================*/ +/* Prototypes */ +/* ---------- */ +/*====================================================================*/ + +static void ffi_prep_args (unsigned char *, extended_cif *); +void +#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2) +__attribute__ ((visibility ("hidden"))) +#endif +ffi_closure_helper_SYSV (ffi_closure *, unsigned long *, + unsigned long long *, unsigned long *); + +/*====================== End of Prototypes ===========================*/ + +/*====================================================================*/ +/* Externals */ +/* --------- */ +/*====================================================================*/ + +extern void ffi_call_SYSV(unsigned, + extended_cif *, + void (*)(unsigned char *, extended_cif *), + unsigned, + void *, + void (*fn)(void)); + +extern void ffi_closure_SYSV(void); + +/*====================== End of Externals ============================*/ + +/*====================================================================*/ +/* */ +/* Name - ffi_check_struct_type. */ +/* */ +/* Function - Determine if a structure can be passed within a */ +/* general purpose or floating point register. */ +/* */ +/*====================================================================*/ + +static int +ffi_check_struct_type (ffi_type *arg) +{ + size_t size = arg->size; + + /* If the struct has just one element, look at that element + to find out whether to consider the struct as floating point. */ + while (arg->type == FFI_TYPE_STRUCT + && arg->elements[0] && !arg->elements[1]) + arg = arg->elements[0]; + + /* Structs of size 1, 2, 4, and 8 are passed in registers, + just like the corresponding int/float types. */ + switch (size) + { + case 1: + return FFI_TYPE_UINT8; + + case 2: + return FFI_TYPE_UINT16; + + case 4: + if (arg->type == FFI_TYPE_FLOAT) + return FFI_TYPE_FLOAT; + else + return FFI_TYPE_UINT32; + + case 8: + if (arg->type == FFI_TYPE_DOUBLE) + return FFI_TYPE_DOUBLE; + else + return FFI_TYPE_UINT64; + + default: + break; + } + + /* Other structs are passed via a pointer to the data. */ + return FFI_TYPE_POINTER; +} + +/*======================== End of Routine ============================*/ + +/*====================================================================*/ +/* */ +/* Name - ffi_prep_args. */ +/* */ +/* Function - Prepare parameters for call to function. */ +/* */ +/* ffi_prep_args is called by the assembly routine once stack space */ +/* has been allocated for the function's arguments. */ +/* */ +/*====================================================================*/ + +static void +ffi_prep_args (unsigned char *stack, extended_cif *ecif) +{ + /* The stack space will be filled with those areas: + + FPR argument register save area (highest addresses) + GPR argument register save area + temporary struct copies + overflow argument area (lowest addresses) + + We set up the following pointers: + + p_fpr: bottom of the FPR area (growing upwards) + p_gpr: bottom of the GPR area (growing upwards) + p_ov: bottom of the overflow area (growing upwards) + p_struct: top of the struct copy area (growing downwards) + + All areas are kept aligned to twice the word size. */ + + int gpr_off = ecif->cif->bytes; + int fpr_off = gpr_off + ROUND_SIZE (MAX_GPRARGS * sizeof (long)); + + unsigned long long *p_fpr = (unsigned long long *)(stack + fpr_off); + unsigned long *p_gpr = (unsigned long *)(stack + gpr_off); + unsigned char *p_struct = (unsigned char *)p_gpr; + unsigned long *p_ov = (unsigned long *)stack; + + int n_fpr = 0; + int n_gpr = 0; + int n_ov = 0; + + ffi_type **ptr; + void **p_argv = ecif->avalue; + int i; + + /* If we returning a structure then we set the first parameter register + to the address of where we are returning this structure. */ + + if (ecif->cif->flags == FFI390_RET_STRUCT) + p_gpr[n_gpr++] = (unsigned long) ecif->rvalue; + + /* Now for the arguments. */ + + for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs; + i > 0; + i--, ptr++, p_argv++) + { + void *arg = *p_argv; + int type = (*ptr)->type; + +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + /* 16-byte long double is passed like a struct. */ + if (type == FFI_TYPE_LONGDOUBLE) + type = FFI_TYPE_STRUCT; +#endif + + /* Check how a structure type is passed. */ + if (type == FFI_TYPE_STRUCT) + { + type = ffi_check_struct_type (*ptr); + + /* If we pass the struct via pointer, copy the data. */ + if (type == FFI_TYPE_POINTER) + { + p_struct -= ROUND_SIZE ((*ptr)->size); + memcpy (p_struct, (char *)arg, (*ptr)->size); + arg = &p_struct; + } + } + + /* Now handle all primitive int/pointer/float data types. */ + switch (type) + { + case FFI_TYPE_DOUBLE: + if (n_fpr < MAX_FPRARGS) + p_fpr[n_fpr++] = *(unsigned long long *) arg; + else +#ifdef __s390x__ + p_ov[n_ov++] = *(unsigned long *) arg; +#else + p_ov[n_ov++] = ((unsigned long *) arg)[0], + p_ov[n_ov++] = ((unsigned long *) arg)[1]; +#endif + break; + + case FFI_TYPE_FLOAT: + if (n_fpr < MAX_FPRARGS) + p_fpr[n_fpr++] = (long long) *(unsigned int *) arg << 32; + else + p_ov[n_ov++] = *(unsigned int *) arg; + break; + + case FFI_TYPE_POINTER: + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = (unsigned long)*(unsigned char **) arg; + else + p_ov[n_ov++] = (unsigned long)*(unsigned char **) arg; + break; + + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: +#ifdef __s390x__ + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = *(unsigned long *) arg; + else + p_ov[n_ov++] = *(unsigned long *) arg; +#else + if (n_gpr == MAX_GPRARGS-1) + n_gpr = MAX_GPRARGS; + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = ((unsigned long *) arg)[0], + p_gpr[n_gpr++] = ((unsigned long *) arg)[1]; + else + p_ov[n_ov++] = ((unsigned long *) arg)[0], + p_ov[n_ov++] = ((unsigned long *) arg)[1]; +#endif + break; + + case FFI_TYPE_UINT32: + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = *(unsigned int *) arg; + else + p_ov[n_ov++] = *(unsigned int *) arg; + break; + + case FFI_TYPE_INT: + case FFI_TYPE_SINT32: + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = *(signed int *) arg; + else + p_ov[n_ov++] = *(signed int *) arg; + break; + + case FFI_TYPE_UINT16: + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = *(unsigned short *) arg; + else + p_ov[n_ov++] = *(unsigned short *) arg; + break; + + case FFI_TYPE_SINT16: + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = *(signed short *) arg; + else + p_ov[n_ov++] = *(signed short *) arg; + break; + + case FFI_TYPE_UINT8: + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = *(unsigned char *) arg; + else + p_ov[n_ov++] = *(unsigned char *) arg; + break; + + case FFI_TYPE_SINT8: + if (n_gpr < MAX_GPRARGS) + p_gpr[n_gpr++] = *(signed char *) arg; + else + p_ov[n_ov++] = *(signed char *) arg; + break; + + default: + FFI_ASSERT (0); + break; + } + } +} + +/*======================== End of Routine ============================*/ + +/*====================================================================*/ +/* */ +/* Name - ffi_prep_cif_machdep. */ +/* */ +/* Function - Perform machine dependent CIF processing. */ +/* */ +/*====================================================================*/ + +ffi_status +ffi_prep_cif_machdep(ffi_cif *cif) +{ + size_t struct_size = 0; + int n_gpr = 0; + int n_fpr = 0; + int n_ov = 0; + + ffi_type **ptr; + int i; + + /* Determine return value handling. */ + + switch (cif->rtype->type) + { + /* Void is easy. */ + case FFI_TYPE_VOID: + cif->flags = FFI390_RET_VOID; + break; + + /* Structures are returned via a hidden pointer. */ + case FFI_TYPE_STRUCT: + cif->flags = FFI390_RET_STRUCT; + n_gpr++; /* We need one GPR to pass the pointer. */ + break; + + /* Floating point values are returned in fpr 0. */ + case FFI_TYPE_FLOAT: + cif->flags = FFI390_RET_FLOAT; + break; + + case FFI_TYPE_DOUBLE: + cif->flags = FFI390_RET_DOUBLE; + break; + +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: + cif->flags = FFI390_RET_STRUCT; + n_gpr++; + break; +#endif + /* Integer values are returned in gpr 2 (and gpr 3 + for 64-bit values on 31-bit machines). */ + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: + cif->flags = FFI390_RET_INT64; + break; + + 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: + /* These are to be extended to word size. */ +#ifdef __s390x__ + cif->flags = FFI390_RET_INT64; +#else + cif->flags = FFI390_RET_INT32; +#endif + break; + + default: + FFI_ASSERT (0); + break; + } + + /* Now for the arguments. */ + + for (ptr = cif->arg_types, i = cif->nargs; + i > 0; + i--, ptr++) + { + int type = (*ptr)->type; + +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + /* 16-byte long double is passed like a struct. */ + if (type == FFI_TYPE_LONGDOUBLE) + type = FFI_TYPE_STRUCT; +#endif + + /* Check how a structure type is passed. */ + if (type == FFI_TYPE_STRUCT) + { + type = ffi_check_struct_type (*ptr); + + /* If we pass the struct via pointer, we must reserve space + to copy its data for proper call-by-value semantics. */ + if (type == FFI_TYPE_POINTER) + struct_size += ROUND_SIZE ((*ptr)->size); + } + + /* Now handle all primitive int/float data types. */ + switch (type) + { + /* The first MAX_FPRARGS floating point arguments + go in FPRs, the rest overflow to the stack. */ + + case FFI_TYPE_DOUBLE: + if (n_fpr < MAX_FPRARGS) + n_fpr++; + else + n_ov += sizeof (double) / sizeof (long); + break; + + case FFI_TYPE_FLOAT: + if (n_fpr < MAX_FPRARGS) + n_fpr++; + else + n_ov++; + break; + + /* On 31-bit machines, 64-bit integers are passed in GPR pairs, + if one is still available, or else on the stack. If only one + register is free, skip the register (it won't be used for any + subsequent argument either). */ + +#ifndef __s390x__ + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: + if (n_gpr == MAX_GPRARGS-1) + n_gpr = MAX_GPRARGS; + if (n_gpr < MAX_GPRARGS) + n_gpr += 2; + else + n_ov += 2; + break; +#endif + + /* Everything else is passed in GPRs (until MAX_GPRARGS + have been used) or overflows to the stack. */ + + default: + if (n_gpr < MAX_GPRARGS) + n_gpr++; + else + n_ov++; + break; + } + } + + /* Total stack space as required for overflow arguments + and temporary structure copies. */ + + cif->bytes = ROUND_SIZE (n_ov * sizeof (long)) + struct_size; + + return FFI_OK; +} + +/*======================== End of Routine ============================*/ + +/*====================================================================*/ +/* */ +/* Name - ffi_call. */ +/* */ +/* Function - Call the FFI routine. */ +/* */ +/*====================================================================*/ + +void +ffi_call(ffi_cif *cif, + void (*fn)(void), + void *rvalue, + void **avalue) +{ + int ret_type = cif->flags; + extended_cif ecif; + + ecif.cif = cif; + ecif.avalue = avalue; + ecif.rvalue = rvalue; + + /* If we don't have a return value, we need to fake one. */ + if (rvalue == NULL) + { + if (ret_type == FFI390_RET_STRUCT) + ecif.rvalue = alloca (cif->rtype->size); + else + ret_type = FFI390_RET_VOID; + } + + switch (cif->abi) + { + case FFI_SYSV: + ffi_call_SYSV (cif->bytes, &ecif, ffi_prep_args, + ret_type, ecif.rvalue, fn); + break; + + default: + FFI_ASSERT (0); + break; + } +} + +/*======================== End of Routine ============================*/ + +/*====================================================================*/ +/* */ +/* Name - ffi_closure_helper_SYSV. */ +/* */ +/* Function - Call a FFI closure target function. */ +/* */ +/*====================================================================*/ + +void +ffi_closure_helper_SYSV (ffi_closure *closure, + unsigned long *p_gpr, + unsigned long long *p_fpr, + unsigned long *p_ov) +{ + unsigned long long ret_buffer; + + void *rvalue = &ret_buffer; + void **avalue; + void **p_arg; + + int n_gpr = 0; + int n_fpr = 0; + int n_ov = 0; + + ffi_type **ptr; + int i; + + /* Allocate buffer for argument list pointers. */ + + p_arg = avalue = alloca (closure->cif->nargs * sizeof (void *)); + + /* If we returning a structure, pass the structure address + directly to the target function. Otherwise, have the target + function store the return value to the GPR save area. */ + + if (closure->cif->flags == FFI390_RET_STRUCT) + rvalue = (void *) p_gpr[n_gpr++]; + + /* Now for the arguments. */ + + for (ptr = closure->cif->arg_types, i = closure->cif->nargs; + i > 0; + i--, p_arg++, ptr++) + { + int deref_struct_pointer = 0; + int type = (*ptr)->type; + +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + /* 16-byte long double is passed like a struct. */ + if (type == FFI_TYPE_LONGDOUBLE) + type = FFI_TYPE_STRUCT; +#endif + + /* Check how a structure type is passed. */ + if (type == FFI_TYPE_STRUCT) + { + type = ffi_check_struct_type (*ptr); + + /* If we pass the struct via pointer, remember to + retrieve the pointer later. */ + if (type == FFI_TYPE_POINTER) + deref_struct_pointer = 1; + } + + /* Pointers are passed like UINTs of the same size. */ + if (type == FFI_TYPE_POINTER) +#ifdef __s390x__ + type = FFI_TYPE_UINT64; +#else + type = FFI_TYPE_UINT32; +#endif + + /* Now handle all primitive int/float data types. */ + switch (type) + { + case FFI_TYPE_DOUBLE: + if (n_fpr < MAX_FPRARGS) + *p_arg = &p_fpr[n_fpr++]; + else + *p_arg = &p_ov[n_ov], + n_ov += sizeof (double) / sizeof (long); + break; + + case FFI_TYPE_FLOAT: + if (n_fpr < MAX_FPRARGS) + *p_arg = &p_fpr[n_fpr++]; + else + *p_arg = (char *)&p_ov[n_ov++] + sizeof (long) - 4; + break; + + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: +#ifdef __s390x__ + if (n_gpr < MAX_GPRARGS) + *p_arg = &p_gpr[n_gpr++]; + else + *p_arg = &p_ov[n_ov++]; +#else + if (n_gpr == MAX_GPRARGS-1) + n_gpr = MAX_GPRARGS; + if (n_gpr < MAX_GPRARGS) + *p_arg = &p_gpr[n_gpr], n_gpr += 2; + else + *p_arg = &p_ov[n_ov], n_ov += 2; +#endif + break; + + case FFI_TYPE_INT: + case FFI_TYPE_UINT32: + case FFI_TYPE_SINT32: + if (n_gpr < MAX_GPRARGS) + *p_arg = (char *)&p_gpr[n_gpr++] + sizeof (long) - 4; + else + *p_arg = (char *)&p_ov[n_ov++] + sizeof (long) - 4; + break; + + case FFI_TYPE_UINT16: + case FFI_TYPE_SINT16: + if (n_gpr < MAX_GPRARGS) + *p_arg = (char *)&p_gpr[n_gpr++] + sizeof (long) - 2; + else + *p_arg = (char *)&p_ov[n_ov++] + sizeof (long) - 2; + break; + + case FFI_TYPE_UINT8: + case FFI_TYPE_SINT8: + if (n_gpr < MAX_GPRARGS) + *p_arg = (char *)&p_gpr[n_gpr++] + sizeof (long) - 1; + else + *p_arg = (char *)&p_ov[n_ov++] + sizeof (long) - 1; + break; + + default: + FFI_ASSERT (0); + break; + } + + /* If this is a struct passed via pointer, we need to + actually retrieve that pointer. */ + if (deref_struct_pointer) + *p_arg = *(void **)*p_arg; + } + + + /* Call the target function. */ + (closure->fun) (closure->cif, rvalue, avalue, closure->user_data); + + /* Convert the return value. */ + switch (closure->cif->rtype->type) + { + /* Void is easy, and so is struct. */ + case FFI_TYPE_VOID: + case FFI_TYPE_STRUCT: +#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE + case FFI_TYPE_LONGDOUBLE: +#endif + break; + + /* Floating point values are returned in fpr 0. */ + case FFI_TYPE_FLOAT: + p_fpr[0] = (long long) *(unsigned int *) rvalue << 32; + break; + + case FFI_TYPE_DOUBLE: + p_fpr[0] = *(unsigned long long *) rvalue; + break; + + /* Integer values are returned in gpr 2 (and gpr 3 + for 64-bit values on 31-bit machines). */ + case FFI_TYPE_UINT64: + case FFI_TYPE_SINT64: +#ifdef __s390x__ + p_gpr[0] = *(unsigned long *) rvalue; +#else + p_gpr[0] = ((unsigned long *) rvalue)[0], + p_gpr[1] = ((unsigned long *) rvalue)[1]; +#endif + break; + + case FFI_TYPE_POINTER: + case FFI_TYPE_UINT32: + case FFI_TYPE_UINT16: + case FFI_TYPE_UINT8: + p_gpr[0] = *(unsigned long *) rvalue; + break; + + case FFI_TYPE_INT: + case FFI_TYPE_SINT32: + case FFI_TYPE_SINT16: + case FFI_TYPE_SINT8: + p_gpr[0] = *(signed long *) rvalue; + break; + + default: + FFI_ASSERT (0); + break; + } +} + +/*======================== End of Routine ============================*/ + +/*====================================================================*/ +/* */ +/* Name - ffi_prep_closure_loc. */ +/* */ +/* Function - Prepare a FFI closure. */ +/* */ +/*====================================================================*/ + +ffi_status +ffi_prep_closure_loc (ffi_closure *closure, + ffi_cif *cif, + void (*fun) (ffi_cif *, void *, void **, void *), + void *user_data, + void *codeloc) +{ + FFI_ASSERT (cif->abi == FFI_SYSV); + +#ifndef __s390x__ + *(short *)&closure->tramp [0] = 0x0d10; /* basr %r1,0 */ + *(short *)&closure->tramp [2] = 0x9801; /* lm %r0,%r1,6(%r1) */ + *(short *)&closure->tramp [4] = 0x1006; + *(short *)&closure->tramp [6] = 0x07f1; /* br %r1 */ + *(long *)&closure->tramp [8] = (long)codeloc; + *(long *)&closure->tramp[12] = (long)&ffi_closure_SYSV; +#else + *(short *)&closure->tramp [0] = 0x0d10; /* basr %r1,0 */ + *(short *)&closure->tramp [2] = 0xeb01; /* lmg %r0,%r1,14(%r1) */ + *(short *)&closure->tramp [4] = 0x100e; + *(short *)&closure->tramp [6] = 0x0004; + *(short *)&closure->tramp [8] = 0x07f1; /* br %r1 */ + *(long *)&closure->tramp[16] = (long)codeloc; + *(long *)&closure->tramp[24] = (long)&ffi_closure_SYSV; +#endif + + closure->cif = cif; + closure->user_data = user_data; + closure->fun = fun; + + return FFI_OK; +} + +/*======================== End of Routine ============================*/ + |