circuitpython/py/nlrx86.S

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* 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
* AUTHORS OR COPYRIGHT HOLDERS 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.
*/
#if defined(__i386__) && !MICROPY_NLR_SETJMP
// We only need the functions here if we are on x86, and we are not
// using setjmp/longjmp.
//
// For reference, x86 callee save regs are:
// ebx, esi, edi, ebp, esp, eip
// the offset of nlr_top within mp_state_ctx_t
#define NLR_TOP_OFFSET (2 * 4)
#if defined(_WIN32) || defined(__CYGWIN__)
#define NLR_OS_WINDOWS
#define NLR_TOP (_mp_state_ctx + NLR_TOP_OFFSET)
#else
#define NLR_TOP (mp_state_ctx + NLR_TOP_OFFSET)
#endif
.file "nlr.s"
.text
/**************************************/
// mp_uint_t nlr_push(4(%esp)=nlr_buf_t *nlr)
#if defined(NLR_OS_WINDOWS)
.globl _nlr_push
.def _nlr_push; .scl 2; .type 32; .endef
_nlr_push:
#else
.globl nlr_push
.type nlr_push, @function
nlr_push:
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#endif
mov 4(%esp), %edx # load nlr_buf
mov (%esp), %eax # load return %ip
mov %eax, 8(%edx) # store %ip into nlr_buf+8
mov %ebp, 12(%edx) # store %bp into nlr_buf+12
mov %esp, 16(%edx) # store %sp into nlr_buf+16
mov %ebx, 20(%edx) # store %bx into nlr_buf+20
mov %edi, 24(%edx) # store %di into nlr_buf
mov %esi, 28(%edx) # store %si into nlr_buf
mov NLR_TOP, %eax # load nlr_top
mov %eax, (%edx) # store it
mov %edx, NLR_TOP # stor new nlr_buf (to make linked list)
xor %eax, %eax # return 0, normal return
ret # return
#if !defined(NLR_OS_WINDOWS)
.size nlr_push, .-nlr_push
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#endif
/**************************************/
// void nlr_pop()
#if defined(NLR_OS_WINDOWS)
.globl _nlr_pop
.def _nlr_pop; .scl 2; .type 32; .endef
_nlr_pop:
#else
.globl nlr_pop
.type nlr_pop, @function
nlr_pop:
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#endif
mov NLR_TOP, %eax # load nlr_top
mov (%eax), %eax # load prev nlr_buf
mov %eax, NLR_TOP # store nlr_top (to unlink list)
ret # return
#if !defined(NLR_OS_WINDOWS)
.size nlr_pop, .-nlr_pop
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#endif
/**************************************/
// void nlr_jump(4(%esp)=mp_uint_t val)
#if defined(NLR_OS_WINDOWS)
.globl _nlr_jump
.def _nlr_jump; .scl 2; .type 32; .endef
_nlr_jump:
#else
.globl nlr_jump
.type nlr_jump, @function
nlr_jump:
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#endif
mov NLR_TOP, %edx # load nlr_top
test %edx, %edx # check for nlr_top being NULL
#if defined(NLR_OS_WINDOWS)
je _nlr_jump_fail # fail if nlr_top is NULL
#else
je nlr_jump_fail # fail if nlr_top is NULL
#endif
mov 4(%esp), %eax # load return value
mov %eax, 4(%edx) # store return value
mov (%edx), %eax # load prev nlr_top
mov %eax, NLR_TOP # store nlr_top (to unlink list)
mov 28(%edx), %esi # load saved %si
mov 24(%edx), %edi # load saved %di
mov 20(%edx), %ebx # load saved %bx
mov 16(%edx), %esp # load saved %sp
mov 12(%edx), %ebp # load saved %bp
mov 8(%edx), %eax # load saved %ip
mov %eax, (%esp) # store saved %ip to stack
xor %eax, %eax # clear return register
inc %al # increase to make 1, non-local return
ret # return
#if !defined(NLR_OS_WINDOWS)
.size nlr_jump, .-nlr_jump
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#endif
#endif // defined(__i386__) && !MICROPY_NLR_SETJMP