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author | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2008-12-30 14:48:33 +0000 |
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committer | xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e> | 2008-12-30 14:48:33 +0000 |
commit | 6d25b4f3fc23601b3a84b4a70aab40ba429ac4b9 (patch) | |
tree | f7adbc5ec8accc4bec3e38939bdf570a266f0e83 /powerpc/eabi/Stacklayout.v | |
parent | 1bce6b0f9f8cd614038a6e7fc21fb984724204a4 (diff) | |
download | compcert-6d25b4f3fc23601b3a84b4a70aab40ba429ac4b9.tar.gz compcert-6d25b4f3fc23601b3a84b4a70aab40ba429ac4b9.zip |
Reorganized the development, modularizing away machine-dependent parts.
Started to merge the ARM code generator.
Started to add support for PowerPC/EABI.
Use ocamlbuild to construct executable from Caml files.
git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@930 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
Diffstat (limited to 'powerpc/eabi/Stacklayout.v')
-rw-r--r-- | powerpc/eabi/Stacklayout.v | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/powerpc/eabi/Stacklayout.v b/powerpc/eabi/Stacklayout.v new file mode 100644 index 00000000..f641847e --- /dev/null +++ b/powerpc/eabi/Stacklayout.v @@ -0,0 +1,79 @@ +(* *********************************************************************) +(* *) +(* The Compcert verified compiler *) +(* *) +(* Xavier Leroy, INRIA Paris-Rocquencourt *) +(* *) +(* Copyright Institut National de Recherche en Informatique et en *) +(* Automatique. All rights reserved. This file is distributed *) +(* under the terms of the INRIA Non-Commercial License Agreement. *) +(* *) +(* *********************************************************************) + +(** Machine- and ABI-dependent layout information for activation records. *) + +Require Import Coqlib. +Require Import Bounds. + +(** In the PowerPC/EABI application binary interface, + the general shape of activation records is as follows, + from bottom (lowest offsets) to top: +- 8 reserved bytes. The first 4 bytes hold the back pointer to the + activation record of the caller. The next 4 bytes hold the + return address. +- Space for outgoing arguments to function calls. +- Local stack slots of integer type. +- Saved values of integer callee-save registers used by the function. +- One word of padding, if necessary to align the following data + on a 8-byte boundary. +- Local stack slots of float type. +- Saved values of float callee-save registers used by the function. +- Space for the stack-allocated data declared in Cminor. + +To facilitate some of the proofs, the Cminor stack-allocated data +starts at offset 0; the preceding areas in the activation record +therefore have negative offsets. This part (with negative offsets) +is called the ``frame'', by opposition with the ``Cminor stack data'' +which is the part with positive offsets. + +The [frame_env] compilation environment records the positions of +the boundaries between areas in the frame part. +*) + +Definition fe_ofs_arg := 8. + +Record frame_env : Set := mk_frame_env { + fe_size: Z; + fe_ofs_link: Z; + fe_ofs_retaddr: Z; + fe_ofs_int_local: Z; + fe_ofs_int_callee_save: Z; + fe_num_int_callee_save: Z; + fe_ofs_float_local: Z; + fe_ofs_float_callee_save: Z; + fe_num_float_callee_save: Z +}. + +(** Computation of the frame environment from the bounds of the current + function. *) + +Definition make_env (b: bounds) := + let oil := 8 + 4 * b.(bound_outgoing) in (* integer locals *) + let oics := oil + 4 * b.(bound_int_local) in (* integer callee-saves *) + let oendi := oics + 4 * b.(bound_int_callee_save) in + let ofl := align oendi 8 in (* float locals *) + let ofcs := ofl + 8 * b.(bound_float_local) in (* float callee-saves *) + let sz := ofcs + 8 * b.(bound_float_callee_save) in (* total frame size *) + mk_frame_env sz 0 4 + oil oics b.(bound_int_callee_save) + ofl ofcs b.(bound_float_callee_save). + + +Remark align_float_part: + forall b, + 8 + 4 * bound_outgoing b + 4 * bound_int_local b + 4 * bound_int_callee_save b <= + align (8 + 4 * bound_outgoing b + 4 * bound_int_local b + 4 * bound_int_callee_save b) 8. +Proof. + intros. apply align_le. omega. +Qed. + |