diff options
Diffstat (limited to 'libffi/src/bfin/sysv.S')
| -rw-r--r-- | libffi/src/bfin/sysv.S | 42 |
1 files changed, 22 insertions, 20 deletions
diff --git a/libffi/src/bfin/sysv.S b/libffi/src/bfin/sysv.S index ae7a152..f4278be 100644 --- a/libffi/src/bfin/sysv.S +++ b/libffi/src/bfin/sysv.S @@ -1,5 +1,6 @@ /* ----------------------------------------------------------------------- - sysv.S - Copyright (c) 2012 Alexandre K. I. de Mendonca <alexandre.keunecke@gmail.com> + sysv.S - Copyright (c) 2012 Alexandre K. I. de Mendonca <alexandre.keunecke@gmail.com>, + Paulo Pizarro <paulo.pizarro@gmail.com> Blackfin Foreign Function Interface @@ -32,7 +33,7 @@ .align 4 /* - There is a "feature" in the bfin toolchain that it puts a _ before funcion names + There is a "feature" in the bfin toolchain that it puts a _ before function names that's why the function here it's called _ffi_call_SYSV and not ffi_call_SYSV */ .global _ffi_call_SYSV; @@ -40,25 +41,26 @@ .func ffi_call_SYSV /* - cif->bytes = R0 (fp+8) - &ecif = R1 (fp+12) - ffi_prep_args = R2 (fp+16) - ret_type = stack (fp+20) - ecif.rvalue = stack (fp+24) - fn = stack (fp+28) - got (fp+32) - There is room for improvement here (we can use temporary registers + cif->bytes = R0 (fp+8) + &ecif = R1 (fp+12) + ffi_prep_args = R2 (fp+16) + ret_type = stack (fp+20) + ecif.rvalue = stack (fp+24) + fn = stack (fp+28) + got (fp+32) + + There is room for improvement here (we can use temporary registers instead of saving the values in the memory) - REGS: - P5 => Stack pointer (function arguments) - R5 => cif->bytes - R4 => ret->type - - FP-20 = P3 - FP-16 = SP (parameters area) - FP-12 = SP (temp) - FP-08 = function return part 1 [R0] - FP-04 = function return part 2 [R1] + REGS: + P5 => Stack pointer (function arguments) + R5 => cif->bytes + R4 => ret->type + + FP-20 = P3 + FP-16 = SP (parameters area) + FP-12 = SP (temp) + FP-08 = function return part 1 [R0] + FP-04 = function return part 2 [R1] */ _ffi_call_SYSV: |