diff options
Diffstat (limited to 'libffi/src/mips/o32.S')
| -rw-r--r-- | libffi/src/mips/o32.S | 62 |
1 files changed, 47 insertions, 15 deletions
diff --git a/libffi/src/mips/o32.S b/libffi/src/mips/o32.S index e2dfa8d..7391ce3 100644 --- a/libffi/src/mips/o32.S +++ b/libffi/src/mips/o32.S @@ -36,7 +36,6 @@ #define flags a3 #define SIZEOF_FRAME ( 4 * FFI_SIZEOF_ARG + 2 * FFI_SIZEOF_ARG ) -#define SIZEOF_FRAME2 ( 8 * FFI_SIZEOF_ARG + 2 * FFI_SIZEOF_ARG ) .text .align 2 @@ -188,7 +187,28 @@ $LFE0: /* ffi_closure_O32. Expects address of the passed-in ffi_closure in t0. Stores any arguments passed in registers onto the stack, then calls ffi_closure_mips_inner_O32, which - then decodes them. */ + then decodes them. + + Stack layout: + + 14 - Start of parameters, original sp + 13 - ra save + 12 - fp save + 11 - $16 (s0) save + 10 - cprestore + 9 - return value high (v1) + 8 - return value low (v0) + 7 - f14 (le high, be low) + 6 - f14 (le low, be high) + 5 - f12 (le high, be low) + 4 - f12 (le low, be high) + 3 - Called function a3 save + 2 - Called function a2 save + 1 - Called function a1 save + 0 - Called function a0 save our sp, fp point here + */ + +#define SIZEOF_FRAME2 ( 14 * FFI_SIZEOF_ARG ) .text .align 2 @@ -202,10 +222,10 @@ $LFB1: .cpload $25 .set reorder SUBU $sp, SIZEOF_FRAME2 - .cprestore SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG + .cprestore SIZEOF_FRAME2 - 4*FFI_SIZEOF_ARG $LCFI4: + REG_S $16, SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($sp) # Save s0 REG_S $fp, SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp) # Save frame pointer -$LCFI5: REG_S ra, SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp) # Save return address $LCFI6: move $fp, $sp @@ -218,14 +238,21 @@ $LCFI7: REG_S $6, SIZEOF_FRAME2 + 2*FFI_SIZEOF_ARG($fp) REG_S $7, SIZEOF_FRAME2 + 3*FFI_SIZEOF_ARG($fp) + # Load ABI enum to $16 + REG_L $16, 20($8) # cif pointer follows tramp. + REG_L $16, 0($16) # abi is first member. + + li $13, 1 # FFI_O32 + bne $16, $13, 1f # Skip fp save if FFI_O32_SOFT_FLOAT + # Store all possible float/double registers. s.d $f12, SIZEOF_FRAME2 - 10*FFI_SIZEOF_ARG($fp) s.d $f14, SIZEOF_FRAME2 - 8*FFI_SIZEOF_ARG($fp) - +1: # Call ffi_closure_mips_inner_O32 to do the work. la $25, ffi_closure_mips_inner_O32 move $4, $8 # Pointer to the ffi_closure - addu $5, $fp, SIZEOF_FRAME2 - 4*FFI_SIZEOF_ARG + addu $5, $fp, SIZEOF_FRAME2 - 6*FFI_SIZEOF_ARG addu $6, $fp, SIZEOF_FRAME2 + 0*FFI_SIZEOF_ARG addu $7, $fp, SIZEOF_FRAME2 - 10*FFI_SIZEOF_ARG jal $31, $25 @@ -235,28 +262,30 @@ $LCFI7: li $9, FFI_TYPE_VOID beq $8, $9, closure_done + li $13, 1 # FFI_O32 + bne $16, $13, 1f # Skip fp restore if FFI_O32_SOFT_FLOAT + li $9, FFI_TYPE_FLOAT - l.s $f0, SIZEOF_FRAME2 - 4*FFI_SIZEOF_ARG($fp) + l.s $f0, SIZEOF_FRAME2 - 6*FFI_SIZEOF_ARG($fp) beq $8, $9, closure_done li $9, FFI_TYPE_DOUBLE - l.d $f0, SIZEOF_FRAME2 - 4*FFI_SIZEOF_ARG($fp) + l.d $f0, SIZEOF_FRAME2 - 6*FFI_SIZEOF_ARG($fp) beq $8, $9, closure_done - +1: li $9, FFI_TYPE_SINT64 - REG_L $3, SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($fp) + REG_L $3, SIZEOF_FRAME2 - 5*FFI_SIZEOF_ARG($fp) beq $8, $9, integer - li $9, FFI_TYPE_UINT64 - REG_L $3, SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($fp) beq $8, $9, integer integer: - REG_L $2, SIZEOF_FRAME2 - 4*FFI_SIZEOF_ARG($fp) + REG_L $2, SIZEOF_FRAME2 - 6*FFI_SIZEOF_ARG($fp) closure_done: # Epilogue move $sp, $fp + REG_L $16, SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($sp) # Restore s0 REG_L $fp, SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp) # Restore frame pointer REG_L ra, SIZEOF_FRAME2 - 1*FFI_SIZEOF_ARG($sp) # Restore return address ADDU $sp, SIZEOF_FRAME2 @@ -319,10 +348,13 @@ $LASFDE1: .byte 0x4 # DW_CFA_advance_loc4 .4byte $LCFI4-$LFB1 .byte 0xe # DW_CFA_def_cfa_offset - .uleb128 0x28 + .uleb128 0x38 .byte 0x4 # DW_CFA_advance_loc4 .4byte $LCFI6-$LCFI4 .byte 0x11 # DW_CFA_offset_extended_sf + .uleb128 0x10 # $16 + .sleb128 -3 # SIZEOF_FRAME2 - 3*FFI_SIZEOF_ARG($sp) + .byte 0x11 # DW_CFA_offset_extended_sf .uleb128 0x1e # $fp .sleb128 -2 # SIZEOF_FRAME2 - 2*FFI_SIZEOF_ARG($sp) .byte 0x11 # DW_CFA_offset_extended_sf @@ -332,7 +364,7 @@ $LASFDE1: .4byte $LCFI7-$LCFI6 .byte 0xc # DW_CFA_def_cfa .uleb128 0x1e - .uleb128 0x28 + .uleb128 0x38 .align 2 $LEFDE1: |