/* ----------------------------------------------------------------------- o32.S - Copyright (c) 1996, 1998 Red Hat, Inc. MIPS 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 CYGNUS SOLUTIONS 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. ----------------------------------------------------------------------- */ #define LIBFFI_ASM #include <fficonfig.h> #include <ffi.h> /* Only build this code if we are compiling for o32 */ #if defined(FFI_MIPS_O32) #define callback a0 #define bytes a2 #define flags a3 #define SIZEOF_FRAME ( 4 * FFI_SIZEOF_ARG + 2 * FFI_SIZEOF_ARG ) .text .align 2 .globl ffi_call_O32 .ent ffi_call_O32 ffi_call_O32: # Prologue SUBU $sp, SIZEOF_FRAME # Frame size REG_S $fp, SIZEOF_FRAME - 2*FFI_SIZEOF_ARG($sp) # Save frame pointer REG_S ra, SIZEOF_FRAME - 1*FFI_SIZEOF_ARG($sp) # Save return address move $fp, $sp move t9, callback # callback function pointer REG_S flags, SIZEOF_FRAME + 3*FFI_SIZEOF_ARG($fp) # flags # Allocate at least 4 words in the argstack move v0, bytes bge bytes, 4 * FFI_SIZEOF_ARG, bigger LI v0, 4 * FFI_SIZEOF_ARG b sixteen bigger: ADDU t0, v0, 2 * FFI_SIZEOF_ARG -1 # make sure it is aligned and v0, t0, -2 * FFI_SIZEOF_ARG # to an 8 byte boundry sixteen: SUBU $sp, $sp, v0 # move the stack pointer to reflect the # arg space ADDU a0, $sp, 4 * FFI_SIZEOF_ARG ADDU a3, $fp, SIZEOF_FRAME + 3*FFI_SIZEOF_ARG jal t9 REG_L t0, SIZEOF_FRAME + 3*FFI_SIZEOF_ARG($fp) # load the flags word add t2, t0, 0 # and copy it into t2 and t0, ((1<<4)-1) # mask out the return type SRL t2, 4 # shift our arg info ADDU $sp, $sp, 4 * FFI_SIZEOF_ARG # adjust $sp to new args bnez t0, pass_d # make it quick for int REG_L a0, 0*FFI_SIZEOF_ARG($sp) # just go ahead and load the REG_L a1, 1*FFI_SIZEOF_ARG($sp) # four regs. REG_L a2, 2*FFI_SIZEOF_ARG($sp) REG_L a3, 3*FFI_SIZEOF_ARG($sp) b call_it pass_d: bne t0, FFI_ARGS_D, pass_f l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args REG_L a2, 2*FFI_SIZEOF_ARG($sp) # passing a double REG_L a3, 3*FFI_SIZEOF_ARG($sp) b call_it pass_f: bne t0, FFI_ARGS_F, pass_d_d l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args REG_L a1, 1*FFI_SIZEOF_ARG($sp) # passing a float REG_L a2, 2*FFI_SIZEOF_ARG($sp) REG_L a3, 3*FFI_SIZEOF_ARG($sp) b call_it pass_d_d: bne t0, FFI_ARGS_DD, pass_f_f l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args l.d $f14, 2*FFI_SIZEOF_ARG($sp) # passing two doubles b call_it pass_f_f: bne t0, FFI_ARGS_FF, pass_d_f l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args l.s $f14, 1*FFI_SIZEOF_ARG($sp) # passing two floats REG_L a2, 2*FFI_SIZEOF_ARG($sp) REG_L a3, 3*FFI_SIZEOF_ARG($sp) b call_it pass_d_f: bne t0, FFI_ARGS_DF, pass_f_d l.d $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args l.s $f14, 2*FFI_SIZEOF_ARG($sp) # passing double and float REG_L a3, 3*FFI_SIZEOF_ARG($sp) b call_it pass_f_d: # assume that the only other combination must be float then double # bne t0, FFI_ARGS_F_D, call_it l.s $f12, 0*FFI_SIZEOF_ARG($sp) # load $fp regs from args l.d $f14, 2*FFI_SIZEOF_ARG($sp) # passing double and float call_it: # Load the function pointer REG_L t9, SIZEOF_FRAME + 5*FFI_SIZEOF_ARG($fp) # If the return value pointer is NULL, assume no return value. REG_L t1, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp) beqz t1, noretval bne t2, FFI_TYPE_INT, retfloat jal t9 REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp) REG_S v0, 0(t0) b epilogue retfloat: bne t2, FFI_TYPE_FLOAT, retdouble jal t9 REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp) s.s $f0, 0(t0) b epilogue retdouble: bne t2, FFI_TYPE_DOUBLE, noretval jal t9 REG_L t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp) s.d $f0, 0(t0) b epilogue noretval: jal t9 # Epilogue epilogue: move $sp, $fp REG_L $fp, SIZEOF_FRAME - 2*FFI_SIZEOF_ARG($sp) # Restore frame pointer REG_L ra, SIZEOF_FRAME - 1*FFI_SIZEOF_ARG($sp) # Restore return address ADDU $sp, SIZEOF_FRAME # Fix stack pointer j ra .end ffi_call_O32 #endif