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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 Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
/* 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 "caml/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 TEXT_SECTION(name) .text
#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) || defined(SYS_cygwin)
#define LBL(x) .L##x
#define G(r) r
#undef GREL
#define GCALL(r) r
#define TEXT_SECTION(name)
#define FUNCTION_ALIGN 4
#define EIGHT_ALIGN 8
#define SIXTEEN_ALIGN 16
#define FUNCTION(name) \
TEXT_SECTION(name); \
.globl name; \
.align FUNCTION_ALIGN; \
name:
#else /* Unix-like operating systems using ELF binaries */
#define LBL(x) .L##x
#define G(r) r
#define GREL(r) r@GOTPCREL
#define GCALL(r) r@PLT
#if defined(FUNCTION_SECTIONS)
#define TEXT_SECTION(name) .section .text.caml.##name,"ax",%progbits
#else
#define TEXT_SECTION(name)
#endif
#define FUNCTION_ALIGN 4
#define EIGHT_ALIGN 8
#define SIXTEEN_ALIGN 16
#define FUNCTION(name) \
TEXT_SECTION(name); \
.globl name; \
.type name,@function; \
.align FUNCTION_ALIGN; \
name:
#endif
#if defined(SYS_linux) || defined(SYS_gnu)
#define ENDFUNCTION(name) \
.size name, . - name
#else
#define ENDFUNCTION(name)
#endif
#include "../runtime/caml/asm.h"
#ifdef WITH_FRAME_POINTERS
#define FRAME_POINTER_SIZE 8
#else
#define FRAME_POINTER_SIZE 0
#endif
#define RETADDR_ENTRY_SIZE (FRAME_POINTER_SIZE + 8) /* fp? + retaddr */
#ifdef WITH_FRAME_POINTERS
#define ENTER_FUNCTION \
pushq %rbp; CFI_ADJUST(8); \
movq %rsp, %rbp;
#define LEAVE_FUNCTION \
popq %rbp; CFI_ADJUST(-8);
#else
#define ENTER_FUNCTION
#define LEAVE_FUNCTION
#endif
#define STACK_RETADDR_OFFSET(reg, ofs) \
(FRAME_POINTER_SIZE + ofs)(reg)
#define STACK_RETADDR(reg) STACK_RETADDR_OFFSET(reg, 0)
#define STACK_ARG_1(reg) STACK_RETADDR_OFFSET(reg, 8)
#define STACK_ARG_2(reg) STACK_RETADDR_OFFSET(reg, 16)
#ifdef DEBUG
#define IF_DEBUG(...) __VA_ARGS__
#else
#define IF_DEBUG(...)
#endif
/* struct stack_info */
#define Stack_sp 0
#define Stack_exception 8
#define Stack_handler 16
/* struct stack_handler */
#define Handler_value(REG) 0(REG)
#define Handler_exception(REG) 8(REG)
#define Handler_effect(REG) 16(REG)
#define Handler_parent 24
/* struct c_stack_link */
#if defined(SYS_mingw64) || defined (SYS_cygwin)
#define Cstack_stack 32
#define Cstack_sp 40
#define Cstack_prev 48
#define SIZEOF_C_STACK_LINK 56
#else
#define Cstack_stack 0
#define Cstack_sp 8
#define Cstack_prev 16
#define SIZEOF_C_STACK_LINK 24
#endif
/******************************************************************************/
/* DWARF */
/******************************************************************************/
/* These amd64-specific register numbers are taken from
Fig. 3.36 ("DWARF Register Number Mapping") of:
System V Application Binary Interface
AMD64 Architecture Processor Supplement
Version 1.0
https://github.com/hjl-tools/x86-psABI/wiki/x86-64-psABI-1.0.pdf */
#define DW_REG_rbx 3
#define DW_REG_rsp 7
#define DW_REG_r13 13
/******************************************************************************/
/* Access to the current domain state block. */
/******************************************************************************/
#define CAML_CONFIG_H_NO_TYPEDEFS
#include "../runtime/caml/config.h"
.set domain_curr_field, 0
#define DOMAIN_STATE(c_type, name) \
.equ domain_field_caml_##name, domain_curr_field ; \
.set domain_curr_field, domain_curr_field + 1
#include "../runtime/caml/domain_state.tbl"
#undef DOMAIN_STATE
#define Caml_state(var) (8*domain_field_caml_##var)(%r14)
/* Load address of global [label] in register [dst]. */
#if defined(__PIC__) && !defined(SYS_mingw64) && !defined(SYS_cygwin)
#define LEA_VAR(label,dst) \
movq GREL(label)(%rip), dst
#else
#define LEA_VAR(label,dst) \
leaq G(label)(%rip), dst
#endif
/******************************************************************************/
/* Stack switching operations */
/******************************************************************************/
/* Switch from OCaml to C stack. Clobbers %r10, %r11. */
#ifdef ASM_CFI_SUPPORTED
#define SWITCH_OCAML_TO_C_CFI \
CFI_REMEMBER_STATE; \
/* %rsp points to the c_stack_link. */ \
.cfi_escape DW_CFA_def_cfa_expression, 5, \
DW_OP_breg + DW_REG_rsp, Cstack_sp, DW_OP_deref, \
DW_OP_plus_uconst, RETADDR_ENTRY_SIZE
#else
#define SWITCH_OCAML_TO_C_CFI
#endif
#define SWITCH_OCAML_TO_C \
/* Fill in Caml_state->current_stack->sp */ \
movq Caml_state(current_stack), %r10; \
movq %rsp, Stack_sp(%r10); \
/* Fill in Caml_state->c_stack */ \
movq Caml_state(c_stack), %r11; \
movq %rsp, Cstack_sp(%r11); \
movq %r10, Cstack_stack(%r11); \
/* Switch to C stack */ \
movq %r11, %rsp; \
SWITCH_OCAML_TO_C_CFI
/* Switch from C to OCaml stack. Clobbers %r11. */
#define SWITCH_C_TO_OCAML \
/* Assert that %rsp == Caml_state->c_stack &&
Caml_state->c_stack->sp == Caml_state->current_stack->sp */ \
IF_DEBUG(cmpq %rsp, Caml_state(c_stack); je 8f; int3; 8: \
movq Caml_state(current_stack), %r11; \
movq Stack_sp(%r11), %r11; \
cmpq %r11, Cstack_sp(%rsp); je 8f; int3; 8:) \
movq Cstack_sp(%rsp), %rsp; \
CFI_RESTORE_STATE
/* Load Caml_state->exn_handler into %rsp and restores prior exn_handler.
Clobbers %r11. */
#define RESTORE_EXN_HANDLER_OCAML \
movq Caml_state(exn_handler), %rsp; \
CFI_DEF_CFA_OFFSET(16); \
leaq Caml_state(exn_handler), %r11; \
popq (%r11); CFI_ADJUST(-8)
/* When ThreadSanitizer instrumentation is enabled, the code must call
the C functions __tsan_func_entry and __tsan_func_exit to signal
function entries and exits. They follow the x86_64 calling
convention of the platform. For efficiency reasons, we don't always
save all caller-saved registers before calling them, but only the
registers in use. */
/* Calls __tsan_func_entry on the current return address. [offset] is the
distance from the current stack pointer to the saved return address, in
bytes. May clobber all caller-saved registers. */
#if defined(WITH_THREAD_SANITIZER)
#define TSAN_ENTER_FUNCTION(offset) \
/* arg 1: pc of raise */ \
movq STACK_RETADDR_OFFSET(%rsp, offset), C_ARG_1; \
SWITCH_OCAML_TO_C; \
C_call (GCALL(__tsan_func_entry)); \
SWITCH_C_TO_OCAML;
/* Calls __tsan_func_exit. May clobber all caller-saved registers. */
#define TSAN_EXIT_FUNCTION \
SWITCH_OCAML_TO_C; \
movq $0, C_ARG_1; \
C_call (GCALL(__tsan_func_exit)); \
SWITCH_C_TO_OCAML;
#else
#define TSAN_ENTER_FUNCTION(offset)
#define TSAN_EXIT_FUNCTION
#endif
/* Switch between OCaml stacks. Clobbers %r12.
Expects old stack in %rsi and target stack in %r10.
Leaves old stack in %rsi and target stack in %r10. */
#define SWITCH_OCAML_STACKS \
ENTER_FUNCTION \
/* Save OCaml SP and exn_handler in the stack info */ \
movq %rsp, Stack_sp(%rsi); \
movq Caml_state(exn_handler), %r12; \
movq %r12, Stack_exception(%rsi); \
/* switch stacks */ \
movq %r10, Caml_state(current_stack); \
movq Stack_sp(%r10), %rsp; \
CFI_DEF_CFA_OFFSET(8); \
/* restore exn_handler for new stack */ \
movq Stack_exception(%r10), %r12; \
movq %r12, Caml_state(exn_handler); \
LEAVE_FUNCTION
/* Updates the oldest saved frame pointer in the target fiber.
A fiber stack may need to grow, causing the reallocation of the entire fiber,
including stack_info and stack_handler structures.
caml_try_realloc_stack will not be able to update the linked list of
frame-pointers if it has been split (ie, in a continuation).
caml_resume and caml_reperform use this macro to update the oldest saved rbp
(highest one in the stack) in case the fiber was reallocated to reattach the
frame-pointer linked list.
REG: Stack_handler(target_fiber)
The frame pointer will be pushed into the stack immediately after these
instructions. The offset of the oldest saved rbp in a fiber from the stack
handler is 48 = 4 words (caml_runstack) + 2 words (rip and rbp).
*/
#ifdef WITH_FRAME_POINTERS
#define UPDATE_BASE_POINTER(REG) \
leaq -8(%rsp), %r11; \
movq %r11, -48(REG)
#else
#define UPDATE_BASE_POINTER(REG)
#endif
/******************************************************************************/
/* Save and restore all callee-save registers on stack.
Keep the stack 16-aligned. */
/******************************************************************************/
#if defined(SYS_mingw64) || defined(SYS_cygwin)
/* Win64 API: callee-save regs are rbx, rbp, rsi, rdi, r12-r15, xmm6-xmm15 */
#define PUSH_CALLEE_SAVE_REGS \
pushq %rbx; CFI_ADJUST (8); CFI_OFFSET(rbx, -16); \
pushq %rbp; CFI_ADJUST (8); CFI_OFFSET(rbp, -24); \
/* Allows debugger to walk the stack */ \
pushq %rsi; CFI_ADJUST (8); CFI_OFFSET(rsi, -32); \
pushq %rdi; CFI_ADJUST (8); CFI_OFFSET(rdi, -40); \
pushq %r12; CFI_ADJUST (8); CFI_OFFSET(r12, -48); \
pushq %r13; CFI_ADJUST (8); CFI_OFFSET(r13, -56); \
pushq %r14; CFI_ADJUST (8); CFI_OFFSET(r14, -64); \
pushq %r15; CFI_ADJUST (8); CFI_OFFSET(r15, -72); \
subq $(10*16), %rsp; CFI_ADJUST (10*16); \
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 $(10*16), %rsp; CFI_ADJUST (-10*16); \
popq %r15; CFI_ADJUST(-8); CFI_SAME_VALUE(r15); \
popq %r14; CFI_ADJUST(-8); CFI_SAME_VALUE(r14); \
popq %r13; CFI_ADJUST(-8); CFI_SAME_VALUE(r13); \
popq %r12; CFI_ADJUST(-8); CFI_SAME_VALUE(r12); \
popq %rdi; CFI_ADJUST(-8); CFI_SAME_VALUE(rdi); \
popq %rsi; CFI_ADJUST(-8); CFI_SAME_VALUE(rsi); \
popq %rbp; CFI_ADJUST(-8); CFI_SAME_VALUE(rbp); \
popq %rbx; CFI_ADJUST(-8); CFI_SAME_VALUE(rbx)
#define CALLEE_SAVE_REGS_SIZE (8 * 8 + 10 * 16)
#else
/* Unix API: callee-save regs are rbx, rbp, r12-r15 */
#define PUSH_CALLEE_SAVE_REGS \
pushq %rbx; CFI_ADJUST(8); CFI_OFFSET(rbx, -16); \
pushq %rbp; CFI_ADJUST(8); CFI_OFFSET(rbp, -24); \
pushq %r12; CFI_ADJUST(8); CFI_OFFSET(r12, -32); \
pushq %r13; CFI_ADJUST(8); CFI_OFFSET(r13, -40); \
pushq %r14; CFI_ADJUST(8); CFI_OFFSET(r14, -48); \
pushq %r15; CFI_ADJUST(8); CFI_OFFSET(r15, -56)
#define POP_CALLEE_SAVE_REGS \
popq %r15; CFI_ADJUST(-8); CFI_SAME_VALUE(r15); \
popq %r14; CFI_ADJUST(-8); CFI_SAME_VALUE(r14); \
popq %r13; CFI_ADJUST(-8); CFI_SAME_VALUE(r13); \
popq %r12; CFI_ADJUST(-8); CFI_SAME_VALUE(r12); \
popq %rbp; CFI_ADJUST(-8); CFI_SAME_VALUE(rbp); \
popq %rbx; CFI_ADJUST(-8); CFI_SAME_VALUE(rbx)
#define CALLEE_SAVE_REGS_SIZE (6 * 8)
#endif
#define C_call(target) call target
/******************************************************************************/
/* Registers holding arguments of C functions. */
/******************************************************************************/
#if defined(SYS_mingw64) || defined(SYS_cygwin)
#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
.text
#if defined(FUNCTION_SECTIONS)
TEXT_SECTION(caml_hot.code_begin)
.globl G(caml_hot.code_begin)
G(caml_hot.code_begin):
TEXT_SECTION(caml_hot.code_end)
.globl G(caml_hot.code_end)
G(caml_hot.code_end):
#endif
/******************************************************************************/
/* text section */
/******************************************************************************/
TEXT_SECTION(caml_system__code_begin)
.globl G(caml_system__code_begin)
G(caml_system__code_begin):
ret /* just one instruction, so that debuggers don't display
caml_system__code_begin instead of caml_call_gc */
/******************************************************************************/
/* Allocation */
/******************************************************************************/
/* Save all of the registers that may be in use to a free gc_regs bucket.
Returns: bucket in %r15. Clobbers %r11 (after saving it) */
#define SAVE_ALL_REGS \
/* First, save the young_ptr. */ \
movq %r15, Caml_state(young_ptr); \
/* Now, use %r15 to point to the gc_regs bucket */ \
/* We save %r11 first to allow it to be scratch */ \
movq Caml_state(gc_regs_buckets), %r15; \
movq %r11, 11*8(%r15); \
movq 0(%r15), %r11; /* next ptr */ \
movq %r11, Caml_state(gc_regs_buckets); \
movq %rax, 0*8(%r15); \
movq %rbx, 1*8(%r15); \
movq %rdi, 2*8(%r15); \
movq %rsi, 3*8(%r15); \
movq %rdx, 4*8(%r15); \
movq %rcx, 5*8(%r15); \
movq %r8, 6*8(%r15); \
movq %r9, 7*8(%r15); \
movq %r12, 8*8(%r15); \
movq %r13, 9*8(%r15); \
movq %r10, 10*8(%r15); \
/* %r11 is at 11*8(%r15); */ \
movq %rbp, 12*8(%r15); \
movsd %xmm0, (0+13)*8(%r15); \
movsd %xmm1, (1+13)*8(%r15); \
movsd %xmm2, (2+13)*8(%r15); \
movsd %xmm3, (3+13)*8(%r15); \
movsd %xmm4, (4+13)*8(%r15); \
movsd %xmm5, (5+13)*8(%r15); \
movsd %xmm6, (6+13)*8(%r15); \
movsd %xmm7, (7+13)*8(%r15); \
movsd %xmm8, (8+13)*8(%r15); \
movsd %xmm9, (9+13)*8(%r15); \
movsd %xmm10, (10+13)*8(%r15); \
movsd %xmm11, (11+13)*8(%r15); \
movsd %xmm12, (12+13)*8(%r15); \
movsd %xmm13, (13+13)*8(%r15); \
movsd %xmm14, (14+13)*8(%r15); \
movsd %xmm15, (15+13)*8(%r15)
/* Undo SAVE_ALL_REGS. Expects gc_regs bucket in %r15 */
#define RESTORE_ALL_REGS \
/* Restore %rax, freeing up the next ptr slot */ \
movq 0*8(%r15), %rax; \
movq Caml_state(gc_regs_buckets), %r11; \
movq %r11, 0(%r15); /* next ptr */ \
movq %r15, Caml_state(gc_regs_buckets); \
/* above: 0*8(%r15),%rax; */ \
movq 1*8(%r15),%rbx; \
movq 2*8(%r15),%rdi; \
movq 3*8(%r15),%rsi; \
movq 4*8(%r15),%rdx; \
movq 5*8(%r15),%rcx; \
movq 6*8(%r15),%r8; \
movq 7*8(%r15),%r9; \
movq 8*8(%r15),%r12; \
movq 9*8(%r15),%r13; \
movq 10*8(%r15),%r10; \
movq 11*8(%r15),%r11; \
movq 12*8(%r15),%rbp; \
movsd (0+13)*8(%r15),%xmm0; \
movsd (1+13)*8(%r15),%xmm1; \
movsd (2+13)*8(%r15),%xmm2; \
movsd (3+13)*8(%r15),%xmm3; \
movsd (4+13)*8(%r15),%xmm4; \
movsd (5+13)*8(%r15),%xmm5; \
movsd (6+13)*8(%r15),%xmm6; \
movsd (7+13)*8(%r15),%xmm7; \
movsd (8+13)*8(%r15),%xmm8; \
movsd (9+13)*8(%r15),%xmm9; \
movsd (10+13)*8(%r15),%xmm10; \
movsd (11+13)*8(%r15),%xmm11; \
movsd (12+13)*8(%r15),%xmm12; \
movsd (13+13)*8(%r15),%xmm13; \
movsd (14+13)*8(%r15),%xmm14; \
movsd (15+13)*8(%r15),%xmm15; \
movq Caml_state(young_ptr), %r15
/* Save non-callee saved registers that may be in use to a free gc_regs
bucket, except for %xmm8 to %xmm15 as they are not used to pass
arguments and return values in the System V amd64 ABI.
Returns: bucket in %r15. Clobbers %r11 (after saving it) */
#ifdef WITH_THREAD_SANITIZER
#define TSAN_SAVE_CALLER_REGS \
/* First, save the young_ptr. */ \
movq %r15, Caml_state(young_ptr); \
/* Now, use %r15 to point to the gc_regs bucket */ \
/* We save %r11 first to allow it to be scratch */ \
movq Caml_state(gc_regs_buckets), %r15; \
movq %r11, 11*8(%r15); \
movq 0(%r15), %r11; /* next ptr */ \
movq %r11, Caml_state(gc_regs_buckets); \
movq %rax, 0*8(%r15); \
movq %rdi, 2*8(%r15); \
movq %rsi, 3*8(%r15); \
movq %rdx, 4*8(%r15); \
movq %rcx, 5*8(%r15); \
movq %r8, 6*8(%r15); \
movq %r9, 7*8(%r15); \
movq %r10, 10*8(%r15); \
/* %r11 is at 11*8(%r15); */ \
movsd %xmm0, (0+13)*8(%r15); \
movsd %xmm1, (1+13)*8(%r15); \
movsd %xmm2, (2+13)*8(%r15); \
movsd %xmm3, (3+13)*8(%r15); \
movsd %xmm4, (4+13)*8(%r15); \
movsd %xmm5, (5+13)*8(%r15); \
movsd %xmm6, (6+13)*8(%r15); \
movsd %xmm7, (7+13)*8(%r15);
#else
#define TSAN_SAVE_CALLER_REGS
#endif
/* Restore registers saved by TSAN_SAVE_CALLER_REGS. Expects gc_regs bucket in
%r15 */
#ifdef WITH_THREAD_SANITIZER
#define TSAN_RESTORE_CALLER_REGS \
/* Restore %rax, freeing up the next ptr slot */ \
movq 0*8(%r15), %rax; \
movq Caml_state(gc_regs_buckets), %r11; \
movq %r11, 0(%r15); /* next ptr */ \
movq %r15, Caml_state(gc_regs_buckets); \
/* above: 0*8(%r15),%rax; */ \
movq 2*8(%r15),%rdi; \
movq 3*8(%r15),%rsi; \
movq 4*8(%r15),%rdx; \
movq 5*8(%r15),%rcx; \
movq 6*8(%r15),%r8; \
movq 7*8(%r15),%r9; \
movq 10*8(%r15),%r10; \
movq 11*8(%r15),%r11; \
movsd (0+13)*8(%r15),%xmm0; \
movsd (1+13)*8(%r15),%xmm1; \
movsd (2+13)*8(%r15),%xmm2; \
movsd (3+13)*8(%r15),%xmm3; \
movsd (4+13)*8(%r15),%xmm4; \
movsd (5+13)*8(%r15),%xmm5; \
movsd (6+13)*8(%r15),%xmm6; \
movsd (7+13)*8(%r15),%xmm7; \
movq Caml_state(young_ptr), %r15
#else
#define TSAN_RESTORE_CALLER_REGS
#endif
FUNCTION(G(caml_call_realloc_stack))
CFI_STARTPROC
CFI_SIGNAL_FRAME
ENTER_FUNCTION
SAVE_ALL_REGS
movq RETADDR_ENTRY_SIZE(%rsp), C_ARG_1 /* argument */
SWITCH_OCAML_TO_C
C_call (GCALL(caml_try_realloc_stack))
SWITCH_C_TO_OCAML
cmpq $0, %rax
jz 1f
RESTORE_ALL_REGS
LEAVE_FUNCTION
ret
1: RESTORE_ALL_REGS
LEA_VAR(caml_exn_Stack_overflow, %rax)
add $16, %rsp /* pop argument, retaddr */
jmp GCALL(caml_raise_exn)
CFI_ENDPROC
ENDFUNCTION(G(caml_call_realloc_stack))
FUNCTION(G(caml_call_gc))
CFI_STARTPROC
CFI_SIGNAL_FRAME
ENTER_FUNCTION
LBL(caml_call_gc):
SAVE_ALL_REGS
movq %r15, Caml_state(gc_regs)
TSAN_ENTER_FUNCTION(0)
SWITCH_OCAML_TO_C
C_call (GCALL(caml_garbage_collection))
SWITCH_C_TO_OCAML
TSAN_EXIT_FUNCTION
movq Caml_state(gc_regs), %r15
RESTORE_ALL_REGS
LEAVE_FUNCTION
ret
CFI_ENDPROC
ENDFUNCTION(G(caml_call_gc))
FUNCTION(G(caml_alloc1))
CFI_STARTPROC
ENTER_FUNCTION
subq $16, %r15
cmpq Caml_state(young_limit), %r15
jb LBL(caml_call_gc)
LEAVE_FUNCTION
ret
CFI_ENDPROC
ENDFUNCTION(G(caml_alloc1))
FUNCTION(G(caml_alloc2))
CFI_STARTPROC
ENTER_FUNCTION
subq $24, %r15
cmpq Caml_state(young_limit), %r15
jb LBL(caml_call_gc)
LEAVE_FUNCTION
ret
CFI_ENDPROC
ENDFUNCTION(G(caml_alloc2))
FUNCTION(G(caml_alloc3))
CFI_STARTPROC
ENTER_FUNCTION
subq $32, %r15
cmpq Caml_state(young_limit), %r15
jb LBL(caml_call_gc)
LEAVE_FUNCTION
ret
CFI_ENDPROC
ENDFUNCTION(G(caml_alloc3))
FUNCTION(G(caml_allocN))
CFI_STARTPROC
ENTER_FUNCTION
cmpq Caml_state(young_limit), %r15
jb LBL(caml_call_gc)
LEAVE_FUNCTION
ret
CFI_ENDPROC
ENDFUNCTION(G(caml_allocN))
/******************************************************************************/
/* Call a C function from OCaml */
/******************************************************************************/
/* Update [young_limit] when returning from non-noalloc extern calls.
Here is C code that can be used to generate RET_FROM_C_CALL for a
new back-end.
#include <stdatomic.h>
#include <stdint.h>
typedef struct { _Atomic(uint64_t) young_limit;
int64_t action_pending; } caml_domain_state;
void ret_from_c_call(caml_domain_state *dom_st)
{
if (__builtin_expect(dom_st->action_pending, 0))
atomic_store_explicit(&dom_st->young_limit, (uint64_t)-1,
memory_order_relaxed);
}
*/
#define RET_FROM_C_CALL \
/* Test the least-significant byte of action_pending */ \
cmpb $0, Caml_state(action_pending); \
jne 1f; \
ret; \
1: movq $-1, Caml_state(young_limit); \
ret
FUNCTION(G(caml_c_call))
CFI_STARTPROC
CFI_SIGNAL_FRAME
ENTER_FUNCTION
TSAN_SAVE_CALLER_REGS
TSAN_ENTER_FUNCTION(0)
TSAN_RESTORE_CALLER_REGS
LBL(caml_c_call):
/* Arguments:
C arguments : %rdi, %rsi, %rdx, %rcx, %r8, and %r9
C function : %rax */
/* Switch from OCaml to C */
SWITCH_OCAML_TO_C
/* Make the alloc ptr available to the C code */
movq %r15, Caml_state(young_ptr)
/* Call the function (address in %rax) */
C_call (*%rax)
/* Prepare for return to OCaml */
movq Caml_state(young_ptr), %r15
/* Load ocaml stack and restore global variables */
SWITCH_C_TO_OCAML
#ifdef WITH_THREAD_SANITIZER
/* Save non-callee-saved registers %rax and %xmm0 before C call */
pushq %rax; CFI_ADJUST(8);
subq $16, %rsp; CFI_ADJUST(16);
movupd %xmm0, (%rsp)
TSAN_EXIT_FUNCTION
movupd (%rsp), %xmm0
addq $16, %rsp; CFI_ADJUST(-16);
popq %rax; CFI_ADJUST(-8);
#endif
LEAVE_FUNCTION
/* Return to OCaml caller */
RET_FROM_C_CALL
CFI_ENDPROC
ENDFUNCTION(G(caml_c_call))
FUNCTION(G(caml_c_call_stack_args))
CFI_STARTPROC
CFI_SIGNAL_FRAME
ENTER_FUNCTION
/* Arguments:
C arguments : %rdi, %rsi, %rdx, %rcx, %r8, and %r9
C function : %rax
C stack args : begin=%r13 end=%r12 */
/* Switch from OCaml to C */
SWITCH_OCAML_TO_C
/* we use %rbx (otherwise unused) to enable backtraces */
movq %rsp, %rbx
#ifdef ASM_CFI_SUPPORTED
.cfi_escape DW_CFA_def_cfa_expression, 5, \
/* %rbp points to the c_stack_link structure */ \
DW_OP_breg + DW_REG_rbx, Cstack_sp, DW_OP_deref, \
DW_OP_plus_uconst, RETADDR_ENTRY_SIZE
#endif
/* Make the alloc ptr available to the C code */
movq %r15, Caml_state(young_ptr)
/* Copy arguments from OCaml to C stack */
#if defined(SYS_mingw64) || defined (SYS_cygwin)
addq $32, %rsp
#endif
LBL(105):
subq $8, %r12
cmpq %r13,%r12
jb LBL(106)
push (%r12); CFI_ADJUST(8)
jmp LBL(105)
LBL(106):
#if defined(SYS_mingw64) || defined (SYS_cygwin)
subq $32, %rsp
#endif
/* Call the function (address in %rax) */
C_call (*%rax)
/* Pop arguments back off the stack */
movq Caml_state(c_stack), %rsp
/* Prepare for return to OCaml */
movq Caml_state(young_ptr), %r15
/* Load ocaml stack and restore global variables */
SWITCH_C_TO_OCAML
/* Return to OCaml caller */
LEAVE_FUNCTION
RET_FROM_C_CALL
CFI_ENDPROC
ENDFUNCTION(G(caml_c_call_stack_args))
/******************************************************************************/
/* Start the OCaml program */
/******************************************************************************/
FUNCTION(G(caml_start_program))
CFI_STARTPROC
CFI_SIGNAL_FRAME
/* Save callee-save registers */
PUSH_CALLEE_SAVE_REGS
#if defined(WITH_THREAD_SANITIZER)
/* We can't use the TSAN_ENTER_FUNCTION macro as it assumes an OCaml stack,
and we are on a C stack. */
/* Save C_ARG_1 before C call */
pushq C_ARG_1; CFI_ADJUST(8)
/* Read return address */
movq (8 + CALLEE_SAVE_REGS_SIZE)(%rsp), C_ARG_1
C_call (GCALL(__tsan_func_entry))
popq C_ARG_1; CFI_ADJUST(-8)
#endif
/* Load Caml_state into r14 (was passed as an argument from C) */
movq C_ARG_1, %r14
/* Initial entry point is G(caml_program) */
LEA_VAR(caml_program, %r12)
#ifdef DEBUG
movq $0, %rax /* dummy */
movq $0, %rbx /* dummy */
movq $0, %rdi /* dummy */
movq $0, %rsi /* dummy */
#endif
/* Common code for caml_start_program and caml_callback* */
LBL(caml_start_program):
/* Load young_ptr into %r15 */
movq Caml_state(young_ptr), %r15
/* Build struct c_stack_link on the C stack */
subq $SIZEOF_C_STACK_LINK, %rsp; CFI_ADJUST(SIZEOF_C_STACK_LINK)
movq $0, Cstack_stack(%rsp)
movq $0, Cstack_sp(%rsp)
movq Caml_state(c_stack), %r10
movq %r10, Cstack_prev(%rsp)
movq %rsp, Caml_state(c_stack)
/* Load the OCaml stack. */
movq Caml_state(current_stack), %r11
movq Stack_sp(%r11), %r10
/* Store the stack pointer to allow DWARF unwind */
subq $16, %r10
movq %rsp, 0(%r10) /* C_STACK_SP */
/* Store the gc_regs for callbacks during a GC */
movq Caml_state(gc_regs), %r11
movq %r11, 8(%r10)
/* Build a handler for exceptions raised in OCaml on the OCaml stack. */
subq $16, %r10
lea LBL(109)(%rip), %r11
movq %r11, 8(%r10)
/* link in the previous exn_handler so that copying stacks works */
movq Caml_state(exn_handler), %r11
movq %r11, 0(%r10)
movq %r10, Caml_state(exn_handler)
/* Switch stacks and call the OCaml code */
movq %r10, %rsp
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
.cfi_escape DW_CFA_def_cfa_expression, 3 + 2, \
/* %rsp points to the exn handler on the OCaml stack */ \
/* %rsp + 16 contains the C_STACK_SP */ \
DW_OP_breg + DW_REG_rsp, 16 /* exn handler */, DW_OP_deref, \
DW_OP_plus_uconst, \
24 /* struct c_stack_link */ + \
6*8 /* callee save regs */ + \
8 /* ret addr */
#endif
call *%r12
LBL(108):
/* pop exn handler */
movq 0(%rsp), %r11
movq %r11, Caml_state(exn_handler)
leaq 16(%rsp), %r10
1: /* restore GC regs */
movq 8(%r10), %r11
movq %r11, Caml_state(gc_regs)
addq $16, %r10
/* Update alloc ptr */
movq %r15, Caml_state(young_ptr)
/* Return to C stack. */
movq Caml_state(current_stack), %r11
movq %r10, Stack_sp(%r11)
movq Caml_state(c_stack), %rsp
CFI_RESTORE_STATE
/* Pop the struct c_stack_link */
movq Cstack_prev(%rsp), %r10
movq %r10, Caml_state(c_stack)
addq $SIZEOF_C_STACK_LINK, %rsp; CFI_ADJUST(-SIZEOF_C_STACK_LINK)
#if defined(WITH_THREAD_SANITIZER)
/* We can't use the TSAN_EXIT_FUNCTION macro as it assumes an OCaml stack,
and we are on a C stack. */
/* Save %rax before C call */
pushq %rax; CFI_ADJUST(8)
movq $0, C_ARG_1
C_call (GCALL(__tsan_func_exit))
popq %rax; CFI_ADJUST(-8)
#endif
/* Restore callee-save registers. */
POP_CALLEE_SAVE_REGS
/* Return to caller. */
ret
LBL(109):
/* Exception handler*/
/* Mark the bucket as an exception result and return it */
orq $2, %rax
/* exn handler already popped here */
movq %rsp, %r10
jmp 1b
CFI_ENDPROC
ENDFUNCTION(G(caml_start_program))
/******************************************************************************/
/* Exceptions */
/******************************************************************************/
/* Raise an exception from OCaml */
FUNCTION(G(caml_raise_exn))
CFI_STARTPROC
ENTER_FUNCTION
LBL(caml_raise_exn):
testq $1, Caml_state(backtrace_active)
jne LBL(116)
RESTORE_EXN_HANDLER_OCAML
ret
LBL(116):
movq $0, Caml_state(backtrace_pos)
LBL(117):
movq %rsp, %r13 /* Save OCaml stack pointer */
movq %rax, %r12 /* Save exception bucket */
movq Caml_state(c_stack), %rsp
movq %rax, C_ARG_1 /* arg 1: exception bucket */
movq STACK_RETADDR(%r13), C_ARG_2 /* arg 2: pc of raise */
leaq STACK_ARG_1(%r13), C_ARG_3 /* arg 3: sp at raise */
movq Caml_state(exn_handler), C_ARG_4 /* arg 4: sp of handler */
C_call (GCALL(caml_stash_backtrace))
movq %r12, %rax /* Recover exception bucket */
RESTORE_EXN_HANDLER_OCAML
ret
CFI_ENDPROC
ENDFUNCTION(G(caml_raise_exn))
#if defined(WITH_THREAD_SANITIZER)
/* When TSan support is enabled, this routine should be called just before
raising an exception. It calls __tsan_func_exit for every OCaml frame about
to be exited due to the exception.
Takes no arguments, clobbers C_ARG_1, C_ARG_2, C_ARG_3 and potentially all
caller-saved registers of the C calling convention. */
FUNCTION(G(caml_tsan_exit_on_raise_asm))
CFI_STARTPROC
ENTER_FUNCTION
movq STACK_RETADDR(%rsp), C_ARG_1 /* arg 1: pc of raise */
leaq STACK_ARG_1(%rsp), C_ARG_2 /* arg 2: sp at raise */
movq Caml_state(exn_handler), C_ARG_3 /* arg 3: sp of handler */
SWITCH_OCAML_TO_C
C_call (GCALL(caml_tsan_exit_on_raise))
SWITCH_C_TO_OCAML
LEAVE_FUNCTION
ret
CFI_ENDPROC
ENDFUNCTION(G(caml_tsan_exit_on_raise_asm))
#endif
FUNCTION(G(caml_reraise_exn))
CFI_STARTPROC
ENTER_FUNCTION
testq $1, Caml_state(backtrace_active)
jne LBL(117)
RESTORE_EXN_HANDLER_OCAML
ret
CFI_ENDPROC
ENDFUNCTION(G(caml_reraise_exn))
/* Raise an exception from C */
FUNCTION(G(caml_raise_exception))
CFI_STARTPROC
ENTER_FUNCTION
movq C_ARG_1, %r14 /* Caml_state */
movq C_ARG_2, %rax
/* Load young_ptr into %r15 */
movq Caml_state(young_ptr), %r15
/* Discard the C stack pointer and reset to ocaml stack */
movq Caml_state(current_stack), %r10
movq Stack_sp(%r10), %rsp /* FIXME: CFI */
#if defined(WITH_THREAD_SANITIZER)
/* Call __tsan_func_exit for every OCaml stack frame exited due to the
exception */
movq STACK_RETADDR(%rsp), C_ARG_1 /* arg 1: pc of raise */
leaq STACK_ARG_1(%rsp), C_ARG_2 /* arg 2: sp at raise */
movq Caml_state(exn_handler), C_ARG_3 /* arg 3: sp of handler */
pushq %rax; CFI_ADJUST(8)
SWITCH_OCAML_TO_C
C_call (GCALL(caml_tsan_exit_on_raise))
SWITCH_C_TO_OCAML
popq %rax; CFI_ADJUST(-8)
#endif
jmp LBL(caml_raise_exn)
CFI_ENDPROC
ENDFUNCTION(G(caml_raise_exception))
/******************************************************************************/
/* Callback from C to OCaml */
/******************************************************************************/
FUNCTION(G(caml_callback_asm))
CFI_STARTPROC
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers C_ARG_1, C_ARG_2, C_ARG_3 before C call
*/
pushq C_ARG_1; CFI_ADJUST(8)
pushq C_ARG_2; CFI_ADJUST(8)
pushq C_ARG_3; CFI_ADJUST(8)
movq 24(%rsp), C_ARG_1 /* Read return address */
C_call (GCALL(__tsan_func_entry))
popq C_ARG_3; CFI_ADJUST(-8)
popq C_ARG_2; CFI_ADJUST(-8)
popq C_ARG_1; CFI_ADJUST(-8)
#endif
/* Save callee-save registers */
PUSH_CALLEE_SAVE_REGS
/* Initial loading of arguments */
movq C_ARG_1, %r14 /* Caml_state */
movq C_ARG_2, %rbx /* closure */
movq 0(C_ARG_3), %rax /* argument */
movq 0(%rbx), %r12 /* code pointer */
movq $0, %rdi /* dummy */
movq $0, %rsi /* dummy */
jmp LBL(caml_start_program)
CFI_ENDPROC
ENDFUNCTION(G(caml_callback_asm))
FUNCTION(G(caml_callback2_asm))
CFI_STARTPROC
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers C_ARG_1, C_ARG_2, C_ARG_3 before C call
*/
pushq C_ARG_1; CFI_ADJUST(8)
pushq C_ARG_2; CFI_ADJUST(8)
pushq C_ARG_3; CFI_ADJUST(8)
movq 24(%rsp), C_ARG_1 /* Read return address */
C_call (GCALL(__tsan_func_entry))
popq C_ARG_3; CFI_ADJUST(-8)
popq C_ARG_2; CFI_ADJUST(-8)
popq C_ARG_1; CFI_ADJUST(-8)
#endif
/* Save callee-save registers */
PUSH_CALLEE_SAVE_REGS
/* Initial loading of arguments */
movq C_ARG_1, %r14 /* Caml_state */
movq C_ARG_2, %rdi /* closure */
movq 0(C_ARG_3), %rax /* first argument */
movq 8(C_ARG_3), %rbx /* second argument */
LEA_VAR(caml_apply2, %r12) /* code pointer */
movq $0, %rsi /* dummy */
jmp LBL(caml_start_program)
CFI_ENDPROC
ENDFUNCTION(G(caml_callback2_asm))
FUNCTION(G(caml_callback3_asm))
CFI_STARTPROC
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers C_ARG_1, C_ARG_2, C_ARG_3 before C call
*/
pushq C_ARG_1; CFI_ADJUST(8)
pushq C_ARG_2; CFI_ADJUST(8)
pushq C_ARG_3; CFI_ADJUST(8)
movq 24(%rsp), C_ARG_1 /* Read return address */
C_call (GCALL(__tsan_func_entry))
popq C_ARG_3; CFI_ADJUST(-8)
popq C_ARG_2; CFI_ADJUST(-8)
popq C_ARG_1; CFI_ADJUST(-8)
#endif
/* Save callee-save registers */
PUSH_CALLEE_SAVE_REGS
/* Initial loading of arguments */
movq C_ARG_1, %r14 /* Caml_state */
movq 0(C_ARG_3), %rax /* first argument */
movq 8(C_ARG_3), %rbx /* second argument */
movq C_ARG_2, %rsi /* closure */
movq 16(C_ARG_3), %rdi /* third argument */
LEA_VAR(caml_apply3, %r12) /* code pointer */
jmp LBL(caml_start_program)
CFI_ENDPROC
ENDFUNCTION(G(caml_callback3_asm))
/******************************************************************************/
/* Fibers */
/*
* A continuation is a one word object that points to a fiber. A fiber [f] will
* point to its parent at Handler_parent(Stack_handler(f)). In the following,
* the [last_fiber] refers to the last fiber in the linked-list formed by the
* parent pointer.
*/
/******************************************************************************/
FUNCTION(G(caml_perform))
CFI_STARTPROC
/* %rax: effect to perform
%rbx: freshly allocated continuation */
movq Caml_state(current_stack), %rsi /* %rsi := old stack */
leaq 1(%rsi), %rdi /* %rdi (last_fiber) := Val_ptr(old stack) */
movq %rdi, 0(%rbx) /* Initialise continuation */
LBL(do_perform):
/* %rdi: last_fiber
%rsi: old stack */
#if defined(WITH_THREAD_SANITIZER)
/* Signal to TSan all stack frames exited by the perform. */
ENTER_FUNCTION
TSAN_SAVE_CALLER_REGS
movq STACK_RETADDR(%rsp), C_ARG_1 /* arg 1: pc of perform */
leaq STACK_ARG_1(%rsp), C_ARG_2 /* arg 2: sp at perform */
SWITCH_OCAML_TO_C
C_call (GCALL(caml_tsan_exit_on_perform))
SWITCH_C_TO_OCAML
TSAN_RESTORE_CALLER_REGS
LEAVE_FUNCTION
#endif
movq %rdi, 8(%rbx) /* Set the last fiber field in the continuation */
movq Stack_handler(%rsi), %r11 /* %r11 := old stack -> handler */
movq Handler_parent(%r11), %r10 /* %r10 := parent stack */
cmpq $0, %r10 /* parent is NULL? */
je LBL(112)
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers %rax, %rdi, %rsi, %r10, %r11 before C
call */
pushq %rax; CFI_ADJUST(8);
pushq %rdi; CFI_ADJUST(8);
pushq %rsi; CFI_ADJUST(8);
pushq %r10; CFI_ADJUST(8);
pushq %r11; CFI_ADJUST(8);
/* Match the TSan-enter made from caml_runstack */
TSAN_EXIT_FUNCTION
popq %r11; CFI_ADJUST(-8);
popq %r10; CFI_ADJUST(-8);
popq %rsi; CFI_ADJUST(-8);
popq %rdi; CFI_ADJUST(-8);
popq %rax; CFI_ADJUST(-8);
#endif
SWITCH_OCAML_STACKS /* preserves r11 and rsi */
/* We have to null the Handler_parent after the switch because the
Handler_parent is needed to unwind the stack for backtraces */
movq $0, Handler_parent(%r11) /* Set parent of performer to NULL */
movq Handler_effect(%r11), %rsi /* %rsi := effect handler */
jmp GCALL(caml_apply3)
LBL(112):
/* Switch back to original performer before raising Effect.Unhandled
(no-op unless this is a reperform) */
movq 0(%rbx), %r10 /* load performer stack from continuation */
subq $1, %r10 /* r10 := Ptr_val(r10) */
movq Caml_state(current_stack), %rsi
SWITCH_OCAML_STACKS
/* No parent stack. Raise Effect.Unhandled. */
ENTER_FUNCTION
#if defined(WITH_THREAD_SANITIZER)
/* We must let the TSan runtime know that we switched back to the
original performer stack. For that, we perform the necessary calls
to __tsan_func_entry via caml_tsan_entry_on_resume.
Note that from TSan's point of view, we just exited all stack
frames, including those of the main fiber. This is ok, because we
re-enter them immediately via caml_tsan_entry_on_resume below. */
TSAN_SAVE_CALLER_REGS
movq STACK_RETADDR(%rsp), C_ARG_1 /* arg 1: pc of perform */
leaq STACK_ARG_1(%rsp), C_ARG_2 /* arg 2: sp at perform */
movq %r10, C_ARG_3 /* arg 3: performer stack */
SWITCH_OCAML_TO_C
C_call (GCALL(caml_tsan_entry_on_resume))
SWITCH_C_TO_OCAML
TSAN_ENTER_FUNCTION(0)
TSAN_RESTORE_CALLER_REGS
#endif
movq %rax, C_ARG_1
LEA_VAR(caml_raise_unhandled_effect, %rax)
jmp LBL(caml_c_call)
CFI_ENDPROC
ENDFUNCTION(G(caml_perform))
FUNCTION(G(caml_reperform))
CFI_STARTPROC
/* %rax: effect to reperform
%rbx: continuation
%rdi: last_fiber */
movq Caml_state(current_stack), %rsi /* %rsi := old stack */
movq (Stack_handler-1)(%rdi), %r10
movq %rsi, Handler_parent(%r10) /* Append to last_fiber */
leaq 1(%rsi), %rdi /* %rdi (last_fiber) := Val_ptr(old stack) */
/* Need to update the oldest saved frame pointer here as the execution of
the handler may have caused the current fiber stack to reallocate. */
UPDATE_BASE_POINTER(%r10)
jmp LBL(do_perform)
CFI_ENDPROC
ENDFUNCTION(G(caml_reperform))
FUNCTION(G(caml_resume))
CFI_STARTPROC
/* %rax -> fiber, %rbx -> fun, %rdi -> arg, %rsi -> last_fiber */
leaq -1(%rax), %r10 /* %r10 (new stack) = Ptr_val(%rax) */
movq %rdi, %rax /* %rax := argument to the function in %rbx */
/* check if stack null, then already used */
testq %r10, %r10
jz 1f
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers %rax, %rsi and %r10 before C call */
ENTER_FUNCTION
pushq %rax; CFI_ADJUST(8);
pushq %rsi; CFI_ADJUST(8);
pushq %r10; CFI_ADJUST(8);
/* Necessary to include the caller of caml_resume in the TSan backtrace */
TSAN_ENTER_FUNCTION(24)
popq %r10; CFI_ADJUST(-8);
popq %rsi; CFI_ADJUST(-8);
popq %rax; CFI_ADJUST(-8);
TSAN_SAVE_CALLER_REGS
/* Signal to TSan all stack frames exited by the perform. */
movq Stack_sp(%r10), %r11
movq STACK_RETADDR(%r11), C_ARG_1 /* arg 1: pc of perform */
leaq STACK_ARG_1(%r11), C_ARG_2 /* arg 2: sp at perform */
movq %r10, C_ARG_3 /* arg 3: fiber */
SWITCH_OCAML_TO_C
C_call (GCALL(caml_tsan_entry_on_resume))
SWITCH_C_TO_OCAML
TSAN_RESTORE_CALLER_REGS
LEAVE_FUNCTION
#endif
/* Add current stack to the last fiber */
movq (Stack_handler-1)(%rsi), %rdi
movq Caml_state(current_stack), %rsi
movq %rsi, Handler_parent(%rdi)
/* Need to update the oldest saved frame pointer here as the current fiber
stack may have been reallocated or we may be resuming a computation
that was not originally run here. */
UPDATE_BASE_POINTER(%rdi)
SWITCH_OCAML_STACKS
jmp *(%rbx)
1: ENTER_FUNCTION
TSAN_ENTER_FUNCTION(0) /* Necessary to include the caller of caml_resume
in the TSan backtrace */
LEA_VAR(caml_raise_continuation_already_resumed, %rax)
jmp LBL(caml_c_call)
CFI_ENDPROC
ENDFUNCTION(G(caml_resume))
/* Run a function on a new stack,
then invoke either the value or exception handler */
FUNCTION(G(caml_runstack))
CFI_STARTPROC
CFI_SIGNAL_FRAME
ENTER_FUNCTION
#ifdef WITH_THREAD_SANITIZER
/* Save non-callee-saved registers %rax and %rdi before C call */
pushq %rax; CFI_ADJUST(8);
pushq %rdi; CFI_ADJUST(8);
/* Necessary to include the caller of caml_runstack in TSan backtrace */
TSAN_ENTER_FUNCTION(16)
popq %rdi; CFI_ADJUST(-8);
popq %rax; CFI_ADJUST(-8);
#endif
/* %rax -> fiber, %rbx -> fun, %rdi -> arg */
andq $-2, %rax /* %rax = Ptr_val(%rax) */
/* save old stack pointer and exception handler */
movq Caml_state(current_stack), %rcx
movq Caml_state(exn_handler), %r10
movq %rsp, Stack_sp(%rcx)
movq %r10, Stack_exception(%rcx)
/* Load new stack pointer and set parent */
movq Stack_handler(%rax), %r11
movq %rcx, Handler_parent(%r11)
movq %rax, Caml_state(current_stack)
movq Stack_sp(%rax), %r11
/* Create an exception handler on the target stack
after 16byte DWARF & gc_regs block (which is unused here) */
subq $32, %r11
leaq LBL(fiber_exn_handler)(%rip), %r10
movq %r10, 8(%r11)
/* link the previous exn_handler so that copying stacks works */
movq Stack_exception(%rax), %r10
movq %r10, 0(%r11)
movq %r11, Caml_state(exn_handler)
/* Switch to the new stack */
movq %r11, %rsp
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
.cfi_escape DW_CFA_def_cfa_expression, 3+3+2, \
DW_OP_breg + DW_REG_rsp, \
16 /* exn */ + \
8 /* gc_regs slot (unused) */ + \
8 /* C_STACK_SP for DWARF (unused) */ \
+ Handler_parent, DW_OP_deref, \
DW_OP_plus_uconst, Stack_sp, DW_OP_deref, \
DW_OP_plus_uconst, RETADDR_ENTRY_SIZE
#endif
movq %rdi, %rax /* first argument */
callq *(%rbx) /* closure in %rbx (second argument) */
LBL(frame_runstack):
leaq 32(%rsp), %r11 /* SP with exn handler popped */
movq Handler_value(%r11), %rbx
1: movq Caml_state(current_stack), C_ARG_1 /* arg to caml_free_stack */
/* restore parent stack and exn_handler into Caml_state */
movq Handler_parent(%r11), %r10
movq Stack_exception(%r10), %r11
movq %r10, Caml_state(current_stack)
movq %r11, Caml_state(exn_handler)
/* free old stack by switching directly to c_stack; is a no-alloc call */
movq Stack_sp(%r10), %r13 /* saved across C call */
CFI_RESTORE_STATE
CFI_REMEMBER_STATE
CFI_DEF_CFA_REGISTER(DW_REG_r13)
movq %rax, %r12 /* save %rax across C call */
movq Caml_state(c_stack), %rsp
C_call (GCALL(caml_free_stack))
/* switch directly to parent stack with correct return */
movq %r13, %rsp
CFI_RESTORE_STATE
/* signal to TSan that we exit caml_runstack (no registers to save here) */
TSAN_EXIT_FUNCTION
movq %r12, %rax
/* Invoke handle_value (or handle_exn) */
LEAVE_FUNCTION
jmp *(%rbx)
LBL(fiber_exn_handler):
leaq 16(%rsp), %r11
movq Handler_exception(%r11), %rbx
jmp 1b
CFI_ENDPROC
ENDFUNCTION(G(caml_runstack))
FUNCTION(G(caml_ml_array_bound_error))
CFI_STARTPROC
ENTER_FUNCTION
/* No registers require saving before C call to TSan */
TSAN_ENTER_FUNCTION(0)
LEA_VAR(caml_array_bound_error_asm, %rax)
jmp LBL(caml_c_call)
CFI_ENDPROC
ENDFUNCTION(G(caml_ml_array_bound_error))
FUNCTION(G(caml_assert_stack_invariants))
CFI_STARTPROC
movq Caml_state(current_stack), %r11
movq %rsp, %r10
subq %r11, %r10 /* %r10: number of bytes left on stack */
/* can be two words over: the return addresses */
cmp $((Stack_threshold_words + Stack_ctx_words - 2)*8), %r10
jge 1f
int3
1: ret
CFI_ENDPROC
ENDFUNCTION(G(caml_assert_stack_invariants))
TEXT_SECTION(caml_system__code_end)
.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 2 /* two descriptors */
.quad LBL(108) /* return address into callback */
.value -1 /* negative frame size => use callback link */
.value 0 /* no roots here */
.align EIGHT_ALIGN
.quad LBL(frame_runstack) /* return address into fiber_val_handler */
.value -1 /* negative frame size => use callback link */
.value 0 /* no roots here */
#if defined(SYS_macosx)
.literal16
#elif defined(SYS_mingw64) || defined(SYS_cygwin)
.section .rdata,"dr"
#else
.section .rodata.cst16,"aM",@progbits,16
#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) || defined(SYS_freebsd)
/* Mark stack as non-executable, PR#4564 */
.section .note.GNU-stack,"",%progbits
#endif
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