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/***********************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 2003 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../LICENSE. */
/* */
/***********************************************************************/
/* $Id$ */
/* Asm part of the runtime system, AMD64 processor */
/* Must be preprocessed by cpp */
/* PIC mode support based on contribution by Paul Stravers (see PR#4795) */
#include "../config/m.h"
#if defined(SYS_macosx)
#define LBL(x) L##x
#define G(r) _##r
#define GREL(r) _##r@GOTPCREL
#define GCALL(r) _##r
#define FUNCTION_ALIGN 2
#define EIGHT_ALIGN 3
#define SIXTEEN_ALIGN 4
#define FUNCTION(name) \
.globl name; \
.align FUNCTION_ALIGN; \
name:
#elif defined(SYS_mingw64)
#define LBL(x) .L##x
#define G(r) r
#undef GREL
#define GCALL(r) r
#define FUNCTION_ALIGN 4
#define EIGHT_ALIGN 8
#define SIXTEEN_ALIGN 16
#define FUNCTION(name) \
.globl name; \
.align FUNCTION_ALIGN; \
name:
#else
#define LBL(x) .L##x
#define G(r) r
#define GREL(r) r@GOTPCREL
#define GCALL(r) r@PLT
#define FUNCTION_ALIGN 4
#define EIGHT_ALIGN 8
#define SIXTEEN_ALIGN 16
#define FUNCTION(name) \
.globl name; \
.type name,@function; \
.align FUNCTION_ALIGN; \
name:
#endif
#ifdef ASM_CFI_SUPPORTED
#define CFI_STARTPROC .cfi_startproc
#define CFI_ENDPROC .cfi_endproc
#define CFI_ADJUST(n) .cfi_adjust_cfa_offset n
#else
#define CFI_STARTPROC
#define CFI_ENDPROC
#define CFI_ADJUST(n)
#endif
#if defined(__PIC__) && !defined(SYS_mingw64)
/* Position-independent operations on global variables. */
/* Store [srcreg] in global [dstlabel]. Clobbers %r11. */
#define STORE_VAR(srcreg,dstlabel) \
movq GREL(dstlabel)(%rip), %r11 ; \
movq srcreg, (%r11)
/* Load global [srclabel] in register [dstreg]. Clobbers %r11. */
#define LOAD_VAR(srclabel,dstreg) \
movq GREL(srclabel)(%rip), %r11 ; \
movq (%r11), dstreg
/* Compare global [label] with register [reg]. Clobbers %rax. */
#define CMP_VAR(label,reg) \
movq GREL(label)(%rip), %rax ; \
cmpq (%rax), reg
/* Test 32-bit global [label] against mask [imm]. Clobbers %r11. */
#define TESTL_VAR(imm,label) \
movq GREL(label)(%rip), %r11 ; \
testl imm, (%r11)
/* Push global [label] on stack. Clobbers %r11. */
#define PUSH_VAR(srclabel) \
movq GREL(srclabel)(%rip), %r11 ; \
pushq (%r11)
/* Pop global [label] off stack. Clobbers %r11. */
#define POP_VAR(dstlabel) \
movq GREL(dstlabel)(%rip), %r11 ; \
popq (%r11)
/* Record lowest stack address and return address. Clobbers %rax. */
#define RECORD_STACK_FRAME(OFFSET) \
pushq %r11 ; \
movq 8+OFFSET(%rsp), %rax ; \
STORE_VAR(%rax,caml_last_return_address) ; \
leaq 16+OFFSET(%rsp), %rax ; \
STORE_VAR(%rax,caml_bottom_of_stack) ; \
popq %r11
#else
/* Non-PIC operations on global variables. Slightly faster. */
#define STORE_VAR(srcreg,dstlabel) \
movq srcreg, G(dstlabel)(%rip)
#define LOAD_VAR(srclabel,dstreg) \
movq G(srclabel)(%rip), dstreg
#define CMP_VAR(label,reg) \
cmpq G(label)(%rip), %r15
#define TESTL_VAR(imm,label) \
testl imm, G(label)(%rip)
#define PUSH_VAR(srclabel) \
pushq G(srclabel)(%rip)
#define POP_VAR(dstlabel) \
popq G(dstlabel)(%rip)
#define RECORD_STACK_FRAME(OFFSET) \
movq OFFSET(%rsp), %rax ; \
STORE_VAR(%rax,caml_last_return_address) ; \
leaq 8+OFFSET(%rsp), %rax ; \
STORE_VAR(%rax,caml_bottom_of_stack)
#endif
/* Save and restore all callee-save registers on stack.
Keep the stack 16-aligned. */
#if defined(SYS_mingw64)
/* Win64 API: callee-save regs are rbx, rbp, rsi, rdi, r12-r15, xmm6-xmm15 */
#define PUSH_CALLEE_SAVE_REGS \
pushq %rbx; \
pushq %rbp; \
pushq %rsi; \
pushq %rdi; \
pushq %r12; \
pushq %r13; \
pushq %r14; \
pushq %r15; \
subq $(8+10*16), %rsp; \
movupd %xmm6, 0*16(%rsp); \
movupd %xmm7, 1*16(%rsp); \
movupd %xmm8, 2*16(%rsp); \
movupd %xmm9, 3*16(%rsp); \
movupd %xmm10, 4*16(%rsp); \
movupd %xmm11, 5*16(%rsp); \
movupd %xmm12, 6*16(%rsp); \
movupd %xmm13, 7*16(%rsp); \
movupd %xmm14, 8*16(%rsp); \
movupd %xmm15, 9*16(%rsp)
#define POP_CALLEE_SAVE_REGS \
movupd 0*16(%rsp), %xmm6; \
movupd 1*16(%rsp), %xmm7; \
movupd 2*16(%rsp), %xmm8; \
movupd 3*16(%rsp), %xmm9; \
movupd 4*16(%rsp), %xmm10; \
movupd 5*16(%rsp), %xmm11; \
movupd 6*16(%rsp), %xmm12; \
movupd 7*16(%rsp), %xmm13; \
movupd 8*16(%rsp), %xmm14; \
movupd 9*16(%rsp), %xmm15; \
addq $(8+10*16), %rsp; \
popq %r15; \
popq %r14; \
popq %r13; \
popq %r12; \
popq %rdi; \
popq %rsi; \
popq %rbp; \
popq %rbx
#else
/* Unix API: callee-save regs are rbx, rbp, r12-r15 */
#define PUSH_CALLEE_SAVE_REGS \
pushq %rbx; \
pushq %rbp; \
pushq %r12; \
pushq %r13; \
pushq %r14; \
pushq %r15; \
subq $8, %rsp
#define POP_CALLEE_SAVE_REGS \
addq $8, %rsp; \
popq %r15; \
popq %r14; \
popq %r13; \
popq %r12; \
popq %rbp; \
popq %rbx
#endif
#ifdef SYS_mingw64
/* Calls from OCaml to C must reserve 32 bytes of extra stack space */
# define PREPARE_FOR_C_CALL subq $32, %rsp
# define CLEANUP_AFTER_C_CALL addq $32, %rsp
#else
# define PREPARE_FOR_C_CALL
# define CLEANUP_AFTER_C_CALL
#endif
.text
.globl G(caml_system__code_begin)
G(caml_system__code_begin):
/* Allocation */
FUNCTION(G(caml_call_gc))
CFI_STARTPROC
RECORD_STACK_FRAME(0)
LBL(caml_call_gc):
#ifndef SYS_mingw64
/* Touch the stack to trigger a recoverable segfault
if insufficient space remains */
subq $32768, %rsp
movq %rax, 0(%rsp)
addq $32768, %rsp
#endif
/* Build array of registers, save it into caml_gc_regs */
pushq %r13
pushq %r12
pushq %rbp
pushq %r11
pushq %r10
pushq %r9
pushq %r8
pushq %rcx
pushq %rdx
pushq %rsi
pushq %rdi
pushq %rbx
pushq %rax
STORE_VAR(%rsp, caml_gc_regs)
/* Save caml_young_ptr, caml_exception_pointer */
STORE_VAR(%r15, caml_young_ptr)
STORE_VAR(%r14, caml_exception_pointer)
/* Save floating-point registers */
subq $(16*8), %rsp
CFI_ADJUST(232)
movsd %xmm0, 0*8(%rsp)
movsd %xmm1, 1*8(%rsp)
movsd %xmm2, 2*8(%rsp)
movsd %xmm3, 3*8(%rsp)
movsd %xmm4, 4*8(%rsp)
movsd %xmm5, 5*8(%rsp)
movsd %xmm6, 6*8(%rsp)
movsd %xmm7, 7*8(%rsp)
movsd %xmm8, 8*8(%rsp)
movsd %xmm9, 9*8(%rsp)
movsd %xmm10, 10*8(%rsp)
movsd %xmm11, 11*8(%rsp)
movsd %xmm12, 12*8(%rsp)
movsd %xmm13, 13*8(%rsp)
movsd %xmm14, 14*8(%rsp)
movsd %xmm15, 15*8(%rsp)
/* Call the garbage collector */
PREPARE_FOR_C_CALL
call GCALL(caml_garbage_collection)
CLEANUP_AFTER_C_CALL
/* Restore caml_young_ptr, caml_exception_pointer */
LOAD_VAR(caml_young_ptr, %r15)
LOAD_VAR(caml_exception_pointer, %r14)
/* Restore all regs used by the code generator */
movsd 0*8(%rsp), %xmm0
movsd 1*8(%rsp), %xmm1
movsd 2*8(%rsp), %xmm2
movsd 3*8(%rsp), %xmm3
movsd 4*8(%rsp), %xmm4
movsd 5*8(%rsp), %xmm5
movsd 6*8(%rsp), %xmm6
movsd 7*8(%rsp), %xmm7
movsd 8*8(%rsp), %xmm8
movsd 9*8(%rsp), %xmm9
movsd 10*8(%rsp), %xmm10
movsd 11*8(%rsp), %xmm11
movsd 12*8(%rsp), %xmm12
movsd 13*8(%rsp), %xmm13
movsd 14*8(%rsp), %xmm14
movsd 15*8(%rsp), %xmm15
addq $(16*8), %rsp
popq %rax
popq %rbx
popq %rdi
popq %rsi
popq %rdx
popq %rcx
popq %r8
popq %r9
popq %r10
popq %r11
popq %rbp
popq %r12
popq %r13
CFI_ADJUST(-232)
/* Return to caller */
ret
CFI_ENDPROC
FUNCTION(G(caml_alloc1))
LBL(caml_alloc1):
subq $16, %r15
CMP_VAR(caml_young_limit, %r15)
jb LBL(100)
ret
LBL(100):
RECORD_STACK_FRAME(0)
subq $8, %rsp
call LBL(caml_call_gc)
addq $8, %rsp
jmp LBL(caml_alloc1)
FUNCTION(G(caml_alloc2))
LBL(caml_alloc2):
subq $24, %r15
CMP_VAR(caml_young_limit, %r15)
jb LBL(101)
ret
LBL(101):
RECORD_STACK_FRAME(0)
subq $8, %rsp
call LBL(caml_call_gc)
addq $8, %rsp
jmp LBL(caml_alloc2)
FUNCTION(G(caml_alloc3))
LBL(caml_alloc3):
subq $32, %r15
CMP_VAR(caml_young_limit, %r15)
jb LBL(102)
ret
LBL(102):
RECORD_STACK_FRAME(0)
subq $8, %rsp
call LBL(caml_call_gc)
addq $8, %rsp
jmp LBL(caml_alloc3)
FUNCTION(G(caml_allocN))
LBL(caml_allocN):
pushq %rax /* save desired size */
subq %rax, %r15
CMP_VAR(caml_young_limit, %r15)
jb LBL(103)
addq $8, %rsp /* drop desired size */
ret
LBL(103):
RECORD_STACK_FRAME(8)
call LBL(caml_call_gc)
popq %rax /* recover desired size */
jmp LBL(caml_allocN)
/* Call a C function from OCaml */
FUNCTION(G(caml_c_call))
LBL(caml_c_call):
/* Record lowest stack address and return address */
popq %r12
STORE_VAR(%r12, caml_last_return_address)
STORE_VAR(%rsp, caml_bottom_of_stack)
pushq %r12
#ifndef SYS_mingw64
/* Touch the stack to trigger a recoverable segfault
if insufficient space remains */
subq $32768, %rsp
movq %rax, 0(%rsp)
addq $32768, %rsp
#endif
/* Make the exception handler and alloc ptr available to the C code */
STORE_VAR(%r15, caml_young_ptr)
STORE_VAR(%r14, caml_exception_pointer)
/* Call the function (address in %rax) */
/* No need to PREPARE_FOR_C_CALL since the caller already
reserved the stack space if needed (cf. amd64/proc.ml) */
jmp *%rax
/* Start the OCaml program */
FUNCTION(G(caml_start_program))
CFI_STARTPROC
/* Save callee-save registers */
PUSH_CALLEE_SAVE_REGS
CFI_ADJUST(56)
/* Initial entry point is G(caml_program) */
leaq GCALL(caml_program)(%rip), %r12
/* Common code for caml_start_program and caml_callback* */
LBL(caml_start_program):
/* Build a callback link */
subq $8, %rsp /* stack 16-aligned */
PUSH_VAR(caml_gc_regs)
PUSH_VAR(caml_last_return_address)
PUSH_VAR(caml_bottom_of_stack)
CFI_ADJUST(32)
/* Setup alloc ptr and exception ptr */
LOAD_VAR(caml_young_ptr, %r15)
LOAD_VAR(caml_exception_pointer, %r14)
/* Build an exception handler */
lea LBL(108)(%rip), %r13
pushq %r13
pushq %r14
CFI_ADJUST(16)
movq %rsp, %r14
/* Call the OCaml code */
call *%r12
LBL(107):
/* Pop the exception handler */
popq %r14
popq %r12 /* dummy register */
CFI_ADJUST(-16)
LBL(109):
/* Update alloc ptr and exception ptr */
STORE_VAR(%r15,caml_young_ptr)
STORE_VAR(%r14,caml_exception_pointer)
/* Pop the callback link, restoring the global variables */
POP_VAR(caml_bottom_of_stack)
POP_VAR(caml_last_return_address)
POP_VAR(caml_gc_regs)
addq $8, %rsp
/* Restore callee-save registers. */
POP_CALLEE_SAVE_REGS
/* Return to caller. */
ret
LBL(108):
/* Exception handler*/
/* Mark the bucket as an exception result and return it */
orq $2, %rax
jmp LBL(109)
CFI_ENDPROC
/* Registers holding arguments of C functions. */
#ifdef SYS_mingw64
#define C_ARG_1 %rcx
#define C_ARG_2 %rdx
#define C_ARG_3 %r8
#define C_ARG_4 %r9
#else
#define C_ARG_1 %rdi
#define C_ARG_2 %rsi
#define C_ARG_3 %rdx
#define C_ARG_4 %rcx
#endif
/* Raise an exception from OCaml */
FUNCTION(G(caml_raise_exn))
TESTL_VAR($1, caml_backtrace_active)
jne LBL(110)
movq %r14, %rsp
popq %r14
ret
LBL(110):
movq %rax, %r12 /* Save exception bucket */
movq %rax, C_ARG_1 /* arg 1: exception bucket */
popq C_ARG_2 /* arg 2: pc of raise */
movq %rsp, C_ARG_3 /* arg 3: sp at raise */
movq %r14, C_ARG_4 /* arg 4: sp of handler */
/* PR#5700: thanks to popq above, stack is now 16-aligned */
PREPARE_FOR_C_CALL /* no need to cleanup after */
call GCALL(caml_stash_backtrace)
movq %r12, %rax /* Recover exception bucket */
movq %r14, %rsp
popq %r14
ret
/* Raise an exception from C */
FUNCTION(G(caml_raise_exception))
TESTL_VAR($1, caml_backtrace_active)
jne LBL(111)
movq C_ARG_1, %rax
LOAD_VAR(caml_exception_pointer, %rsp) /* Cut stack */
popq %r14 /* Recover previous exception handler */
LOAD_VAR(caml_young_ptr, %r15) /* Reload alloc ptr */
ret
LBL(111):
movq C_ARG_1, %r12 /* Save exception bucket */
/* arg 1: exception bucket */
LOAD_VAR(caml_last_return_address,C_ARG_2) /* arg 2: pc of raise */
LOAD_VAR(caml_bottom_of_stack,C_ARG_3) /* arg 3: sp of raise */
LOAD_VAR(caml_exception_pointer,C_ARG_4) /* arg 4: sp of handler */
subq $8, %rsp /* PR#5700: maintain stack alignment */
PREPARE_FOR_C_CALL /* no need to cleanup after */
call GCALL(caml_stash_backtrace)
movq %r12, %rax /* Recover exception bucket */
LOAD_VAR(caml_exception_pointer,%rsp)
popq %r14 /* Recover previous exception handler */
LOAD_VAR(caml_young_ptr,%r15) /* Reload alloc ptr */
ret
/* Callback from C to OCaml */
FUNCTION(G(caml_callback_exn))
/* Save callee-save registers */
PUSH_CALLEE_SAVE_REGS
/* Initial loading of arguments */
movq C_ARG_1, %rbx /* closure */
movq C_ARG_2, %rax /* argument */
movq 0(%rbx), %r12 /* code pointer */
jmp LBL(caml_start_program)
FUNCTION(G(caml_callback2_exn))
/* Save callee-save registers */
PUSH_CALLEE_SAVE_REGS
/* Initial loading of arguments */
movq C_ARG_1, %rdi /* closure -- no op with Unix conventions */
movq C_ARG_2, %rax /* first argument */
movq C_ARG_3, %rbx /* second argument */
leaq GCALL(caml_apply2)(%rip), %r12 /* code pointer */
jmp LBL(caml_start_program)
FUNCTION(G(caml_callback3_exn))
/* Save callee-save registers */
PUSH_CALLEE_SAVE_REGS
/* Initial loading of arguments */
movq C_ARG_2, %rax /* first argument */
movq C_ARG_3, %rbx /* second argument */
movq C_ARG_1, %rsi /* closure */
movq C_ARG_4, %rdi /* third argument */
leaq GCALL(caml_apply3)(%rip), %r12 /* code pointer */
jmp LBL(caml_start_program)
FUNCTION(G(caml_ml_array_bound_error))
leaq GCALL(caml_array_bound_error)(%rip), %rax
jmp LBL(caml_c_call)
.globl G(caml_system__code_end)
G(caml_system__code_end):
.data
.globl G(caml_system__frametable)
.align EIGHT_ALIGN
G(caml_system__frametable):
.quad 1 /* one descriptor */
.quad LBL(107) /* return address into callback */
.value -1 /* negative frame size => use callback link */
.value 0 /* no roots here */
.align EIGHT_ALIGN
#if defined(SYS_macosx)
.literal16
#elif defined(SYS_mingw64)
.section .rdata,"dr"
#else
.section .rodata.cst8,"a",@progbits
#endif
.globl G(caml_negf_mask)
.align SIXTEEN_ALIGN
G(caml_negf_mask):
.quad 0x8000000000000000, 0
.globl G(caml_absf_mask)
.align SIXTEEN_ALIGN
G(caml_absf_mask):
.quad 0x7FFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF
#if defined(SYS_linux)
/* Mark stack as non-executable, PR#4564 */
.section .note.GNU-stack,"",%progbits
#endif
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