294 lines
8.4 KiB
ArmAsm
294 lines
8.4 KiB
ArmAsm
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* Automatique. Distributed only by permission. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* Asm part of the runtime system, Intel 386 processor */
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/* Must be preprocessed by cpp */
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/* Linux with ELF binaries does not prefix identifiers with _.
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Linux with a.out binaries, FreeBSD, and NextStep do. */
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#if defined(SYS_linux_elf) || defined(SYS_solaris)
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#define G(x) x
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#define FUNCTION_ALIGN 4
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#else
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#define G(x) _##x
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#define FUNCTION_ALIGN 2
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#endif
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/* Allocation */
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.text
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.globl G(caml_call_gc)
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.globl G(caml_alloc1)
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.globl G(caml_alloc2)
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.globl G(caml_alloc3)
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.globl G(caml_alloc)
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G(caml_call_gc):
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/* Build caml_context structure on stack
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and save it into caml_last_context. */
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pushl %ebp
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pushl %edi
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pushl %esi
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pushl %edx
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pushl %ecx
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pushl %ebx
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pushl %eax
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movl %esp, G(caml_last_context)
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/* Call the garbage collector */
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call G(garbage_collection)
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/* Restore all regs used by the code generator */
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popl %eax
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popl %ebx
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popl %ecx
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popl %edx
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popl %esi
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popl %edi
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popl %ebp
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/* Return to caller */
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ret
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.align FUNCTION_ALIGN
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G(caml_alloc1):
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movl G(young_ptr), %eax
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subl $8, %eax
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movl %eax, G(young_ptr)
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cmpl G(young_limit), %eax
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jb L100
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ret
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L100: pushl %ebp
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pushl %edi
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pushl %esi
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pushl %edx
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pushl %ecx
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pushl %ebx
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pushl %eax
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movl %esp, G(caml_last_context)
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call G(garbage_collection)
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popl %eax
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popl %ebx
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popl %ecx
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popl %edx
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popl %esi
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popl %edi
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popl %ebp
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jmp G(caml_alloc1)
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.align FUNCTION_ALIGN
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G(caml_alloc2):
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movl G(young_ptr), %eax
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subl $12, %eax
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movl %eax, G(young_ptr)
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cmpl G(young_limit), %eax
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jb L101
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ret
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L101: pushl %ebp
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pushl %edi
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pushl %esi
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pushl %edx
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pushl %ecx
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pushl %ebx
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pushl %eax
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movl %esp, G(caml_last_context)
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call G(garbage_collection)
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popl %eax
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popl %ebx
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popl %ecx
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popl %edx
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popl %esi
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popl %edi
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popl %ebp
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jmp G(caml_alloc2)
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.align FUNCTION_ALIGN
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G(caml_alloc3):
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movl G(young_ptr), %eax
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subl $16, %eax
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movl %eax, G(young_ptr)
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cmpl G(young_limit), %eax
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jb L102
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ret
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L102: pushl %ebp
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pushl %edi
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pushl %esi
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pushl %edx
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pushl %ecx
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pushl %ebx
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pushl %eax
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movl %esp, G(caml_last_context)
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call G(garbage_collection)
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popl %eax
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popl %ebx
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popl %ecx
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popl %edx
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popl %esi
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popl %edi
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popl %ebp
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jmp G(caml_alloc3)
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.align FUNCTION_ALIGN
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G(caml_alloc):
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subl G(young_ptr), %eax /* eax = size - young_ptr */
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negl %eax /* eax = young_ptr - size */
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cmpl G(young_limit), %eax
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jb L103
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movl %eax, G(young_ptr)
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ret
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L103: subl G(young_ptr), %eax /* eax = - size */
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negl %eax /* eax = size */
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pushl %ebp
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pushl %edi
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pushl %esi
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pushl %edx
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pushl %ecx
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pushl %ebx
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pushl %eax
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movl %esp, G(caml_last_context)
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call G(garbage_collection)
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popl %eax
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popl %ebx
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popl %ecx
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popl %edx
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popl %esi
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popl %edi
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popl %ebp
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jmp G(caml_alloc)
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/* Call a C function from Caml */
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.globl G(caml_c_call)
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.align FUNCTION_ALIGN
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G(caml_c_call):
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/* Build caml_context structure on stack
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and save it into caml_last_context.
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We don't fill the gc_regs section, because no registers
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are live across caml_c_call. */
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lea -28(%esp), %edx
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movl %edx, G(caml_last_context)
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/* Call the function (address in %eax) */
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jmp *%eax
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/* Start the Caml program */
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.globl G(caml_start_program)
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.align FUNCTION_ALIGN
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G(caml_start_program):
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/* Save callee-save registers */
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %ebp
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/* Initial entry point is caml_program */
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movl $ G(caml_program), %esi
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/* Common code for caml_start_program and callback* */
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L106:
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/* Build a callback link */
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pushl G(caml_last_context)
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/* Build an exception handler */
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pushl $L108
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pushl G(caml_exception_pointer)
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movl %esp, G(caml_exception_pointer)
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/* Call the Caml code */
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call *%esi
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L107:
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/* Pop the exception handler */
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popl G(caml_exception_pointer)
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popl %esi /* dummy register */
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/* Pop the callback link, restoring caml_last_context */
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popl G(caml_last_context)
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/* Restore callee-save registers. */
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popl %ebp
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popl %edi
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popl %esi
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popl %ebx
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/* Return to caller. */
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ret
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L108:
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/* Exception handler*/
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/* Pop the callback link, restoring caml_last_context */
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popl G(caml_last_context)
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/* Re-raise the exception through mlraise,
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so that local C roots are cleaned up correctly. */
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pushl %eax /* exn bucket is the argument */
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call G(mlraise) /* never returns */
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/* Raise an exception from C */
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.globl G(raise_caml_exception)
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.align FUNCTION_ALIGN
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G(raise_caml_exception):
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movl 4(%esp), %eax
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movl G(caml_exception_pointer), %esp
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popl G(caml_exception_pointer)
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ret
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/* Callback from C to Caml */
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.globl G(callback)
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.align FUNCTION_ALIGN
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G(callback):
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/* Save callee-save registers */
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %ebp
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/* Initial loading of arguments */
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movl 20(%esp), %ebx /* closure */
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movl 24(%esp), %eax /* argument */
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movl 0(%ebx), %esi /* code pointer */
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jmp L106
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.globl G(callback2)
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.align FUNCTION_ALIGN
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G(callback2):
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/* Save callee-save registers */
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %ebp
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/* Initial loading of arguments */
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movl 20(%esp), %ecx /* closure */
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movl 24(%esp), %eax /* first argument */
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movl 28(%esp), %ebx /* second argument */
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movl $ G(caml_apply2), %esi /* code pointer */
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jmp L106
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.globl G(callback3)
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.align FUNCTION_ALIGN
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G(callback3):
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/* Save callee-save registers */
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %ebp
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/* Initial loading of arguments */
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movl 20(%esp), %edx /* closure */
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movl 24(%esp), %eax /* first argument */
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movl 28(%esp), %ebx /* second argument */
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movl 32(%esp), %ecx /* third argument */
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movl $ G(caml_apply3), %esi /* code pointer */
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jmp L106
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.data
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.globl G(system_frametable)
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G(system_frametable):
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.long 1 /* one descriptor */
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.long L107 /* return address into callback */
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#ifndef SYS_solaris
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.word -1 /* negative frame size => use callback link */
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.word 0 /* no roots here */
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#else
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.value -1 /* negative frame size => use callback link */
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.value 0 /* no roots here */
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#endif
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