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|
/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Gallium, INRIA Rocquencourt */
/* Bill O'Farrell, IBM */
/* */
/* Copyright 2015 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* Copyright 2015 IBM (Bill O'Farrell with help from Tristan Amini). */
/* */
/* 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. */
/* */
/**************************************************************************/
#include "caml/m.h"
#include "caml/asm.h"
/* Special registers */
#define DOMAIN_STATE_PTR %r10
#define ALLOC_PTR %r11
#define TRAP_PTR %r13
#define TMP %r1
#define TMP2 %r12 /* callee-saved register, use with caution */
#define TMP3 %r0
/* Don't use TMP3 for indexed access in form of offset(TMP3) */
#define C_ARG_1 %r2
#define C_ARG_2 %r3
#define C_ARG_3 %r4
#define C_ARG_4 %r5
#define ADDITIONAL_ARG %r7
#define LBL(x) .L##x
#define G(r) r
#define GREL(r) r@GOT
#define GCALL(r) r@PLT
#if defined(FUNCTION_SECTIONS)
#define TEXT_SECTION(name) \
.section .text.caml.##name,"ax",@progbits
#else
#define TEXT_SECTION(name) \
.section .text
#endif
#if defined(FUNCTION_SECTIONS)
TEXT_SECTION(caml_hot.code_begin)
.globl caml_hot.code_begin
caml_hot.code_begin:
TEXT_SECTION(caml_hot.code_end)
.globl caml_hot.code_end
caml_hot.code_end:
#endif
#define FUNCTION(name) \
TEXT_SECTION(name); \
.globl name; \
TYPE_DIRECTIVE(name,@function) \
name:
#define ENDFUNCTION(name) \
SIZE_DIRECTIVE(name)
#define OBJECT(name) \
.align 8; \
.globl name; \
TYPE_DIRECTIVE(name,@object) \
name:
#define ENDOBJECT(name) \
SIZE_DIRECTIVE(name)
/* Stack space to be reserved by the caller of a C function */
#define RESERVED_STACK 160
/* special sleb128 constants, precalculated */
/* Cstack_sp + 160 = 8 + 160 = 168, encoded as sleb128 */
#define Cstack_sp_plus_160_sleb128_2byte 168, 1
/* struct c_stack_link + callee save regs = 24 + 8*8 = 88 */
#define start_program_sleb128_2byte 216, 0
/* exception handler + gc_regs slot + C_STACK_SP + Handler_parent
= 16 + 8 + 8 + 24 = 56 */
#define caml_runstack_sleb128_1byte 56
#define RETADDR_ENTRY_SIZE 8 /* retaddr */
/* Function prologue and epilogue */
#define ENTER_FUNCTION \
lay %r15, -8(%r15); \
CFI_ADJUST(8); \
stg %r14, 0(%r15)
#define LEAVE_FUNCTION \
lg %r14, 0(%r15); \
CFI_RESTORE(14); \
la %r15, 8(%r15); \
CFI_ADJUST(-8)
#define PREPARE_FOR_C_CALL CFI_REMEMBER_STATE
#define CLEANUP_AFTER_C_CALL CFI_RESTORE_STATE
/* 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 */
#define Cstack_stack (RESERVED_STACK + 0)
#define Cstack_sp (RESERVED_STACK + 8)
#define Cstack_prev (RESERVED_STACK + 16)
#define SIZEOF_C_STACK_LINK (RESERVED_STACK + 24)
/******************************************************************************/
/* DWARF */
/******************************************************************************/
/* These s390x-specific register numbers are taken from
Table 1.17 ("DWARF Register Number Mapping") of:
ELF Application Binary Interface
s390x Supplement
Version 1.6
https://github.com/IBM/s390x-abi/releases/download/v1.6/lzsabi_s390x.pdf
*/
#define DW_REG_r9 9
#define DW_REG_r12 12
#define DW_REG_r15 15
/******************************************************************************/
/* Access to the current domain state block. */
/******************************************************************************/
.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(%r10)
/* Allocation functions and GC interface.
Referenced from C code in runtime/startup_nat.c
*/
TEXT_SECTION(caml_system__code_begin)
.globl caml_system__code_begin
caml_system__code_begin:
#if defined(__PIC__)
#define LEA_VAR(label,dst) \
lgrl dst, GREL(label)
#else
#define LEA_VAR(label,dst) \
larl dst, G(label)
#endif
/******************************************************************************/
/* Stack switching operations */
/******************************************************************************/
#ifdef ASM_CFI_SUPPORTED
#define SWITCH_OCAML_TO_C_CFI \
CFI_REMEMBER_STATE; \
CFI_OFFSET(14, 0); \
/* %r15 points to the c_stack_link. */ \
.cfi_escape DW_CFA_def_cfa_expression, 3, \
DW_OP_breg + DW_REG_r15, Cstack_sp, DW_OP_deref
#else
#define SWITCH_OCAML_TO_C_CFI
#endif
/* Switch from OCaml to C stack. Clobbers %r1, %r12. */
#define SWITCH_OCAML_TO_C \
/* Fill in Caml_state->current_stack->sp */ \
lg TMP, Caml_state(current_stack); \
stg %r15, Stack_sp(TMP); \
/* Fill in Caml_state->c_stack */ \
lg TMP2, Caml_state(c_stack); \
stg TMP, Cstack_stack(TMP2); \
stg %r15, Cstack_sp(TMP2); \
/* Switch to C stack */ \
lgr %r15, TMP2; \
SWITCH_OCAML_TO_C_CFI
/* Switch from C to OCaml stack. */
#define SWITCH_C_TO_OCAML \
lg %r15, Cstack_sp(%r15); \
CFI_RESTORE_STATE
#define SWITCH_OCAML_STACKS(old_stack, new_stack) \
/* Save return address for old_stack */ \
ENTER_FUNCTION; \
/* Save OCaml SP and exn_handler in the stack info */ \
stg %r15, Stack_sp(old_stack); \
stg TRAP_PTR, Stack_exception(old_stack); \
/* switch stacks */ \
stg new_stack, Caml_state(current_stack); \
lg %r15, Stack_sp(new_stack); \
/* restore exn_handler for new stack */ \
lg TRAP_PTR, Stack_exception(new_stack); \
/* Restore return address for new_stack */ \
LEAVE_FUNCTION
/******************************************************************************/
/* Allocation */
/******************************************************************************/
/* Save all of the registers that may be in use to a free gc_regs bucket
and store ALLOC_PTR and TRAP_PTR back to Caml_state
At the end the saved registers are placed in Caml_state(gc_regs)
*/
#define SAVE_ALL_REGS \
/* First, save the young_ptr. */ \
stg ALLOC_PTR, Caml_state(young_ptr); \
stg TRAP_PTR, Caml_state(exn_handler); \
/* Now, use ALLOC_PTR to point to the gc_regs bucket */ \
lg ALLOC_PTR, Caml_state(gc_regs_buckets);\
lg %r0, 0(ALLOC_PTR); /* next ptr */ \
stg %r0, Caml_state(gc_regs_buckets); \
/* Save allocatable registers */ \
stmg %r2,%r9, (2*8)(ALLOC_PTR); \
stg %r12, 10*8(ALLOC_PTR); \
std %f0, (0+11)*8(ALLOC_PTR); \
std %f1, (1+11)*8(ALLOC_PTR); \
std %f2, (2+11)*8(ALLOC_PTR); \
std %f3, (3+11)*8(ALLOC_PTR); \
std %f4, (4+11)*8(ALLOC_PTR); \
std %f5, (5+11)*8(ALLOC_PTR); \
std %f6, (6+11)*8(ALLOC_PTR); \
std %f7, (7+11)*8(ALLOC_PTR); \
std %f8, (8+11)*8(ALLOC_PTR); \
std %f9, (9+11)*8(ALLOC_PTR); \
std %f10, (10+11)*8(ALLOC_PTR); \
std %f11, (11+11)*8(ALLOC_PTR); \
std %f12, (12+11)*8(ALLOC_PTR); \
std %f13, (13+11)*8(ALLOC_PTR); \
std %f14, (14+11)*8(ALLOC_PTR); \
std %f15, (15+11)*8(ALLOC_PTR); \
la ALLOC_PTR, 16(ALLOC_PTR); \
stg ALLOC_PTR, Caml_state(gc_regs); \
lg ALLOC_PTR, Caml_state(young_ptr);
/* Undo SAVE_ALL_REGS. Expects gc_regs bucket in %r11 */
#define RESTORE_ALL_REGS \
lg ALLOC_PTR, Caml_state(gc_regs); \
lay ALLOC_PTR, -16(ALLOC_PTR); \
/* Restore registers */ \
lmg %r2,%r9, (2*8)(ALLOC_PTR); \
lg %r12, 10*8(ALLOC_PTR); \
ld %f0, (0+11)*8(ALLOC_PTR); \
ld %f1, (1+11)*8(ALLOC_PTR); \
ld %f2, (2+11)*8(ALLOC_PTR); \
ld %f3, (3+11)*8(ALLOC_PTR); \
ld %f4, (4+11)*8(ALLOC_PTR); \
ld %f5, (5+11)*8(ALLOC_PTR); \
ld %f6, (6+11)*8(ALLOC_PTR); \
ld %f7, (7+11)*8(ALLOC_PTR); \
ld %f8, (8+11)*8(ALLOC_PTR); \
ld %f9, (9+11)*8(ALLOC_PTR); \
ld %f10, (10+11)*8(ALLOC_PTR); \
ld %f11, (11+11)*8(ALLOC_PTR); \
ld %f12, (12+11)*8(ALLOC_PTR); \
ld %f13, (13+11)*8(ALLOC_PTR); \
ld %f14, (14+11)*8(ALLOC_PTR); \
ld %f15, (15+11)*8(ALLOC_PTR); \
/* Put gc_regs struct back in bucket linked list */\
lg %r0, Caml_state(gc_regs_buckets); \
stg %r0, 0(ALLOC_PTR); /* next ptr */ \
stg ALLOC_PTR, Caml_state(gc_regs_buckets);\
/* Reload new allocation pointer & exn handler */ \
lg ALLOC_PTR, Caml_state(young_ptr); \
lg TRAP_PTR, Caml_state(exn_handler);
#if defined(WITH_THREAD_SANITIZER) /* { */
/* Setup a C call stack frame (which is the caller's duty), and save the
current value of the return address to the stack.
This is similar to ENTER_FUNCTION, but allocating more stack space. */
#define TSAN_SETUP_C_CALL \
lay %r15, -(RESERVED_STACK+8)(%r15); \
CFI_ADJUST(RESERVED_STACK+8); \
stg %r14, (RESERVED_STACK+0)(%r15)
/* Restore the value of the return address from the stack and undo the C call
stack frame. */
#define TSAN_CLEANUP_AFTER_C_CALL \
lg %r14, (RESERVED_STACK+0)(%r15); \
CFI_RESTORE(14); \
la %r15, (RESERVED_STACK+8)(%r15); \
CFI_ADJUST(-(RESERVED_STACK+8))
/* Invoke a C function, switching back and forth the OCaml and C stacks. */
#define TSAN_C_CALL(fun) \
SWITCH_OCAML_TO_C; \
TSAN_SETUP_C_CALL; \
brasl %r14, GCALL(fun); \
TSAN_CLEANUP_AFTER_C_CALL; \
SWITCH_C_TO_OCAML
/* Invoke __tsan_func_entry(return address in the caller) */
#define TSAN_ENTER_FUNCTION \
lgr C_ARG_1, %r14; /* arg1: return address in caller */ \
TSAN_C_CALL(__tsan_func_entry)
/* Invoke __tsan_func_exit(0) */
#define TSAN_EXIT_FUNCTION \
lgfi C_ARG_1, 0; \
TSAN_C_CALL(__tsan_func_exit)
/* This is similar to SAVE_ALL_REGS, but only saving the caller-saved
registers. */
#define TSAN_SAVE_CALLER_REGS \
/* First, save the young_ptr. */ \
stg ALLOC_PTR, Caml_state(young_ptr); \
stg TRAP_PTR, Caml_state(exn_handler); \
/* Now, use ALLOC_PTR to point to the gc_regs bucket */ \
lg ALLOC_PTR, Caml_state(gc_regs_buckets);\
lg %r0, 0(ALLOC_PTR); /* next ptr */ \
stg %r0, Caml_state(gc_regs_buckets); \
/* Save caller-saved registers */ \
stmg %r2,%r5, (2*8)(ALLOC_PTR); \
std %f0, (0+11)*8(ALLOC_PTR); \
std %f1, (1+11)*8(ALLOC_PTR); \
std %f2, (2+11)*8(ALLOC_PTR); \
std %f3, (3+11)*8(ALLOC_PTR); \
std %f4, (4+11)*8(ALLOC_PTR); \
std %f5, (5+11)*8(ALLOC_PTR); \
std %f6, (6+11)*8(ALLOC_PTR); \
std %f7, (7+11)*8(ALLOC_PTR); \
la ALLOC_PTR, 16(ALLOC_PTR); \
stg ALLOC_PTR, Caml_state(gc_regs); \
lg ALLOC_PTR, Caml_state(young_ptr)
/* This is similar to RESTORE_ALL_REGS, but only restoring the caller-saved
registers. */
#define TSAN_RESTORE_CALLER_REGS \
lg ALLOC_PTR, Caml_state(gc_regs); \
lay ALLOC_PTR, -16(ALLOC_PTR); \
/* Restore registers */ \
lmg %r2,%r5, (2*8)(ALLOC_PTR); \
ld %f0, (0+11)*8(ALLOC_PTR); \
ld %f1, (1+11)*8(ALLOC_PTR); \
ld %f2, (2+11)*8(ALLOC_PTR); \
ld %f3, (3+11)*8(ALLOC_PTR); \
ld %f4, (4+11)*8(ALLOC_PTR); \
ld %f5, (5+11)*8(ALLOC_PTR); \
ld %f6, (6+11)*8(ALLOC_PTR); \
ld %f7, (7+11)*8(ALLOC_PTR); \
/* Put gc_regs struct back in bucket linked list */\
lg %r0, Caml_state(gc_regs_buckets); \
stg %r0, 0(ALLOC_PTR); /* next ptr */ \
stg ALLOC_PTR, Caml_state(gc_regs_buckets);\
/* Reload new allocation pointer & exn handler */ \
lg ALLOC_PTR, Caml_state(young_ptr); \
lg TRAP_PTR, Caml_state(exn_handler)
#else /* } { */
#define TSAN_ENTER_FUNCTION
#define TSAN_EXIT_FUNCTION
#define TSAN_SAVE_CALLER_REGS
#define TSAN_RESTORE_CALLER_REGS
#endif /* } */
FUNCTION(G(caml_call_realloc_stack))
CFI_STARTPROC
CFI_SIGNAL_FRAME
ENTER_FUNCTION
CFI_OFFSET(14, -168)
SAVE_ALL_REGS
lgr C_ARG_1, %r12 /* requested size */
SWITCH_OCAML_TO_C
PREPARE_FOR_C_CALL
#ifdef ASM_CFI_SUPPORTED
.cfi_escape DW_CFA_def_cfa_expression, 4, DW_OP_breg + DW_REG_r15, \
Cstack_sp_plus_160_sleb128_2byte, DW_OP_deref
#endif
brasl %r14, GCALL(caml_try_realloc_stack)
CLEANUP_AFTER_C_CALL
SWITCH_C_TO_OCAML
cgfi %r2, 0
je LBL(120)
RESTORE_ALL_REGS
LEAVE_FUNCTION
br %r14
LBL(120):
RESTORE_ALL_REGS
LEAVE_FUNCTION
LEA_VAR(caml_exn_Stack_overflow, %r2)
brcl 15, GCALL(caml_raise_exn)
CFI_ENDPROC
ENDFUNCTION(G(caml_call_realloc_stack))
FUNCTION(G(caml_call_gc))
CFI_STARTPROC
LBL(caml_call_gc):
CFI_SIGNAL_FRAME
ENTER_FUNCTION
CFI_OFFSET(14, -168)
SAVE_ALL_REGS
TSAN_ENTER_FUNCTION
SWITCH_OCAML_TO_C
PREPARE_FOR_C_CALL
#ifdef ASM_CFI_SUPPORTED
.cfi_escape DW_CFA_def_cfa_expression, 4, DW_OP_breg + DW_REG_r15, \
Cstack_sp_plus_160_sleb128_2byte, DW_OP_deref
#endif
brasl %r14, GCALL(caml_garbage_collection)
CLEANUP_AFTER_C_CALL
SWITCH_C_TO_OCAML
TSAN_EXIT_FUNCTION
RESTORE_ALL_REGS
LEAVE_FUNCTION
br %r14
CFI_ENDPROC
ENDFUNCTION(G(caml_call_gc))
FUNCTION(G(caml_alloc1))
CFI_STARTPROC
lay ALLOC_PTR, -16(ALLOC_PTR)
clg ALLOC_PTR, Caml_state(young_limit)
jl LBL(caml_call_gc)
br %r14
CFI_ENDPROC
ENDFUNCTION(G(caml_alloc1))
FUNCTION(G(caml_alloc2))
CFI_STARTPROC
lay ALLOC_PTR, -24(ALLOC_PTR)
clg ALLOC_PTR, Caml_state(young_limit)
jl LBL(caml_call_gc)
br %r14
CFI_ENDPROC
ENDFUNCTION(G(caml_alloc2))
FUNCTION(G(caml_alloc3))
CFI_STARTPROC
lay ALLOC_PTR, -32(ALLOC_PTR)
clg ALLOC_PTR, Caml_state(young_limit)
jl LBL(caml_call_gc)
br %r14
CFI_ENDPROC
ENDFUNCTION(G(caml_alloc3))
FUNCTION(G(caml_allocN))
CFI_STARTPROC
clg ALLOC_PTR, Caml_state(young_limit)
jl LBL(caml_call_gc)
br %r14
CFI_ENDPROC
ENDFUNCTION(G(caml_allocN))
/******************************************************************************/
/* Call a C function from OCaml */
/******************************************************************************/
#define RET_FROM_C_CALL \
/* Test the least-significant byte of action_pending */ \
cli 7+Caml_state(action_pending), 0; \
ber %r14; \
lghi TMP, -1; \
stg TMP, Caml_state(young_limit); \
br %r14
FUNCTION(G(caml_c_call))
CFI_STARTPROC
CFI_SIGNAL_FRAME
ENTER_FUNCTION
CFI_OFFSET(14, -168)
TSAN_SAVE_CALLER_REGS
TSAN_ENTER_FUNCTION
TSAN_RESTORE_CALLER_REGS
LBL(caml_c_call):
/* Arguments:
C arguments : %r2, %r3, %r4, %r5, %r6
C function : ADDITIONAL_ARG */
/* Switch from OCaml to C */
SWITCH_OCAML_TO_C
/* Make the exception handler alloc ptr available to the C code */
stg ALLOC_PTR, Caml_state(young_ptr)
stg TRAP_PTR, Caml_state(exn_handler)
/* Call the function (address in ADDITIONAL_ARG) */
PREPARE_FOR_C_CALL
#ifdef ASM_CFI_SUPPORTED
.cfi_escape DW_CFA_def_cfa_expression, 4, DW_OP_breg + DW_REG_r15, \
Cstack_sp_plus_160_sleb128_2byte, DW_OP_deref
#endif
basr %r14, ADDITIONAL_ARG
CLEANUP_AFTER_C_CALL
/* Reload new allocation pointer & exn handler */
lg ALLOC_PTR, Caml_state(young_ptr)
lg TRAP_PTR, Caml_state(exn_handler)
/* Load ocaml stack and restore global variables */
SWITCH_C_TO_OCAML
#if defined(WITH_THREAD_SANITIZER)
/* Save return value registers. Since the called function could be
anything, it may have returned its result (if any) either in %r2
or %f0. */
lay %r15, -16(%r15)
CFI_ADJUST(16)
stg %r2, 0(%r15)
std %f0, 8(%r15)
TSAN_EXIT_FUNCTION
/* Restore return value registers */
ld %f0, 8(%r15)
lg %r2, 0(%r15)
la %r15, 16(%r15)
CFI_ADJUST(-16)
#endif
/* Return to OCaml caller */
LEAVE_FUNCTION
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
CFI_OFFSET(14, -168)
/* Arguments:
C arguments : %r2, %r3, %r4, %r5, %r6
C function : ADDITIONAL_ARG
C stack args : begin=%r9 end=%r8 */
/* Switch from OCaml to C */
SWITCH_OCAML_TO_C
/* Make the exception handler alloc ptr available to the C code */
stg ALLOC_PTR, Caml_state(young_ptr)
stg TRAP_PTR, Caml_state(exn_handler)
/* Store sp to restore after call */
lgr %r12, %r15
#ifdef ASM_CFI_SUPPORTED
.cfi_escape DW_CFA_def_cfa_expression, 3, \
/* %r12 points to the c_stack_link structure */ \
DW_OP_breg + DW_REG_r12, Cstack_sp, DW_OP_deref
#endif
/* Copy arguments from OCaml to C stack, always reserving
the 160 bytes at the bottom of the C stack. */
LBL(105):
lay %r8, -8(%r8)
clgr %r8, %r9
jl LBL(106)
lg %r0, 0(%r8)
lay %r15, -8(%r15)
stg %r0, RESERVED_STACK(%r15)
CFI_ADJUST(8)
brcl 15, LBL(105)
LBL(106):
/* Call the function (address in %r7) */
PREPARE_FOR_C_CALL
basr %r14, ADDITIONAL_ARG
CLEANUP_AFTER_C_CALL
/* Restore stack */
lgr %r15, %r12
/* Reload new allocation pointer & exn handler */
lg ALLOC_PTR, Caml_state(young_ptr)
lg TRAP_PTR, Caml_state(exn_handler)
/* Switch from C to OCaml */
SWITCH_C_TO_OCAML
/* Return */
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
#if defined(WITH_THREAD_SANITIZER)
lay %r15, -8(%r15)
CFI_ADJUST(8)
stg C_ARG_1, 0(%r15)
/* We can't use TSAN_ENTER_FUNCTION here, as it assumes to run on an
OCaml stack, yet we are still on a C stack at this point. */
lgr C_ARG_1, %r14
TSAN_SETUP_C_CALL
brasl %r14, GCALL(__tsan_func_entry)
TSAN_CLEANUP_AFTER_C_CALL
lg C_ARG_1, 0(%r15)
la %r15, 8(%r15)
CFI_ADJUST(-8)
#endif
/* Load Caml_state into TMP (was passed as an argument from C) */
lgr TMP3, C_ARG_1
/* Initial entry point is G(caml_program) */
LEA_VAR(caml_program, TMP)
/* Common code for caml_start_program and caml_callback* */
LBL(caml_start_program):
/* Allocate stack frame */
lay %r15, -RESERVED_STACK(%r15)
/* Save all callee-save registers + return address */
/* GPR 6..14 at sp + 0 ... sp + 64
FPR 10..15 at sp + 72 ... sp + 128 */
stmg %r6,%r14, 0(%r15)
CFI_OFFSET(14, 64 - RESERVED_STACK)
std %f8, 72(%r15)
std %f9, 80(%r15)
std %f10, 88(%r15)
std %f11, 96(%r15)
std %f12, 104(%r15)
std %f13, 112(%r15)
std %f14, 120(%r15)
std %f15, 128(%r15)
/* Load domain state pointer from argument */
lgr DOMAIN_STATE_PTR, TMP3
/* Reload allocation pointer */
lg ALLOC_PTR, Caml_state(young_ptr)
/* Build struct c_stack_link on the C stack */
lay %r15, -SIZEOF_C_STACK_LINK(%r15)
CFI_ADJUST(SIZEOF_C_STACK_LINK)
lg TMP3, Caml_state(c_stack)
lgfi TMP2, 0
stg TMP2, Cstack_stack(%r15)
stg TMP2, Cstack_sp(%r15)
stg TMP3, Cstack_prev(%r15)
stg %r15, Caml_state(c_stack)
/* Load the OCaml stack. */
lg %r8, Caml_state(current_stack)
lg %r8, Stack_sp(%r8)
/* Store the stack pointer to allow DWARF unwind */
lay %r8, -16(%r8)
stg %r15, 0(%r8) /* C_STACK_SP */
/* Store the gc_regs for callbacks during a GC */
lg %r9, Caml_state(gc_regs)
stg %r9, 8(%r8)
/* Build a handler for exceptions raised in OCaml on the OCaml stack. */
lay %r8, -16(%r8)
/* link in the previous exn_handler so that copying stacks works */
lg %r9, Caml_state(exn_handler)
stg %r9, 0(%r8)
larl %r9, LBL(trap_handler)
stg %r9, 8(%r8)
stg %r8, Caml_state(exn_handler)
lgr TRAP_PTR, %r8
/* Switch stacks and call the OCaml code */
lgr %r15, %r8
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
CFI_OFFSET(14, 0)
.cfi_escape DW_CFA_def_cfa_expression, 3 + 3, \
/* %r15 points to the exn handler on the OCaml stack */ \
/* %r15 + 16 contains the C_STACK_SP */ \
DW_OP_breg + DW_REG_r15, 16 /* exn handler */, DW_OP_deref, \
DW_OP_plus_uconst, start_program_sleb128_2byte
#endif
basr %r14, TMP
LBL(caml_retaddr):
/* pop exn handler */
lg %r8, 0(%r15)
la %r15, 16(%r15)
stg %r8, Caml_state(exn_handler)
LBL(return_result): /* restore GC regs */
lg %r9, 8(%r15)
la %r15, 16(%r15)
stg %r9, Caml_state(gc_regs)
/* Update alloc ptr */
stg ALLOC_PTR, Caml_state(young_ptr)
/* Return to C stack. */
lg %r8, Caml_state(current_stack)
stg %r15, Stack_sp(%r8)
lg %r15, Caml_state(c_stack)
CFI_RESTORE_STATE
/* Pop the struct c_stack_link */
lg %r8, Cstack_prev(%r15)
stg %r8, Caml_state(c_stack)
la %r15, SIZEOF_C_STACK_LINK(%r15)
CFI_ADJUST(SIZEOF_C_STACK_LINK)
#if defined(WITH_THREAD_SANITIZER)
/* We can't use TSAN_EXIT_FUNCTION here, as it assumes to run on an
OCaml stack, and we are back to a C stack at this point. */
lay %r15, -8(%r15)
CFI_ADJUST(8)
stg C_ARG_1, 0(%r15)
lgfi C_ARG_1, 0
TSAN_SETUP_C_CALL
brasl %r14, GCALL(__tsan_func_exit)
TSAN_CLEANUP_AFTER_C_CALL
lg C_ARG_1, 0(%r15)
la %r15, 8(%r15)
CFI_ADJUST(-8)
#endif
/* Restore callee-save registers. */
lmg %r6,%r14, 0(%r15)
CFI_RESTORE(14)
ld %f8, 72(%r15)
ld %f9, 80(%r15)
ld %f10, 88(%r15)
ld %f11, 96(%r15)
ld %f12, 104(%r15)
ld %f13, 112(%r15)
ld %f14, 120(%r15)
ld %f15, 128(%r15)
/* Return */
la %r15, RESERVED_STACK(%r15)
/* Return to caller. */
br %r14
LBL(trap_handler):
/* Exception handler*/
stg TRAP_PTR, Caml_state(exn_handler)
/* Mark the bucket as an exception result and return it */
oill %r2, 2
j LBL(return_result)
CFI_ENDPROC
ENDFUNCTION(G(caml_start_program))
/******************************************************************************/
/* Exceptions */
/******************************************************************************/
#define JUMP_TO_TRAP_PTR \
lgr %r15, TRAP_PTR; \
lg TMP, 8(%r15); \
lg TRAP_PTR, 0(%r15); \
la %r15, 16(%r15); \
br TMP;
/* Raise an exception from OCaml */
FUNCTION(G(caml_raise_exn))
CFI_STARTPROC
LBL(caml_raise_exn):
clghsi Caml_state(backtrace_active), 0
jne LBL(117)
LBL(116):
JUMP_TO_TRAP_PTR
LBL(117):
/* Zero backtrace_pos */
lgfi TMP, 0
stg TMP, Caml_state(backtrace_pos)
LBL(caml_reraise_exn_stash):
lgr %r9, %r2 /* Save exception bucket */
/* Stash the backtrace */
/* arg1: exception bucket, already in r2 */
lgr C_ARG_2, %r14 /* arg2: PC of raise */
lgr C_ARG_3, %r15 /* arg3: SP of raise */
lgr C_ARG_4, TRAP_PTR /* arg4: SP of handler */
/* Switch to C stack */
lg %r15, Caml_state(c_stack)
PREPARE_FOR_C_CALL
CFI_ADJUST(RESERVED_STACK)
brasl %r14, GCALL(caml_stash_backtrace)
CLEANUP_AFTER_C_CALL
/* Restore exception bucket and raise */
lgr %r2, %r9
brcl 15, LBL(116)
CFI_ENDPROC
ENDFUNCTION(G(caml_raise_exn))
FUNCTION(G(caml_reraise_exn))
CFI_STARTPROC
clghsi Caml_state(backtrace_active), 0
jne LBL(caml_reraise_exn_stash)
JUMP_TO_TRAP_PTR
CFI_ENDPROC
ENDFUNCTION(G(caml_reraise_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 a0, a1, a2 and potentially all
caller-saved registers of the C calling convention. */
FUNCTION(G(caml_tsan_exit_on_raise_asm))
CFI_STARTPROC
lgr C_ARG_1, %r14 /* arg1: pc of raise */
lgr C_ARG_2, %r15 /* arg2: sp of raise */
lgr C_ARG_3, TRAP_PTR /* arg3: sp of handler */
TSAN_C_CALL(caml_tsan_exit_on_raise)
br %r14
CFI_ENDPROC
ENDFUNCTION(G(caml_tsan_exit_on_raise_asm))
#endif
/* Raise an exception from C */
FUNCTION(G(caml_raise_exception))
CFI_STARTPROC
/* Load the domain state ptr */
lgr DOMAIN_STATE_PTR, C_ARG_1
/* Load the exception bucket */
lgr C_ARG_1, C_ARG_2
/* Reload trap ptr and alloc ptr */
lg TRAP_PTR, Caml_state(exn_handler)
lg ALLOC_PTR, Caml_state(young_ptr)
/* Discard the C stack pointer and reset to ocaml stack */
lg TMP, Caml_state(current_stack)
lg %r15, Stack_sp(TMP)
#if defined(WITH_THREAD_SANITIZER)
lgr C_ARG_2, %r15
lay %r15, -8(%r15)
CFI_ADJUST(8)
stg C_ARG_1, 0(%r15) /* preserve exception bucket */
/* Call __tsan_func_exit for every OCaml stack frame exited due to the
exception */
lg C_ARG_1, 0(C_ARG_2) /* arg1: pc of raise */
/* This stack address adjustment is required to compensate the
saving of r14 in SWITCH_OCAML_STACKS, which causes Stack_sp()
to be 8 bytes lower than expected. */
la C_ARG_2, 8(C_ARG_2) /* arg2: sp of raise */
lgr C_ARG_3, TRAP_PTR /* arg3: sp of handler */
TSAN_C_CALL(caml_tsan_exit_on_raise)
lg C_ARG_1, 0(%r15)
la %r15, 8(%r15)
CFI_ADJUST(-8)
#endif
/* Restore frame and link on return to OCaml */
LEAVE_FUNCTION
brcl 15, 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 r2, r3, r4 and r14 before C call */
lay %r15, -(RESERVED_STACK+32)(%r15)
CFI_ADJUST(RESERVED_STACK+32)
stg C_ARG_1, (RESERVED_STACK+0)(%r15)
stg C_ARG_2, (RESERVED_STACK+8)(%r15)
stg C_ARG_3, (RESERVED_STACK+16)(%r15)
stg %r14, (RESERVED_STACK+24)(%r15)
lgr C_ARG_1, %r14
brasl %r14, GCALL(__tsan_func_entry)
lg %r14, (RESERVED_STACK+24)(%r15)
lg C_ARG_3, (RESERVED_STACK+16)(%r15)
lg C_ARG_2, (RESERVED_STACK+8)(%r15)
lg C_ARG_1, (RESERVED_STACK+0)(%r15)
la %r15, (RESERVED_STACK+32)(%r15)
CFI_ADJUST(-(RESERVED_STACK+32))
#endif
/* Initial shuffling of arguments */
/* (%r2 = Caml_state, %r3 = closure, 0(%r4) = first arg) */
lgr TMP3, C_ARG_1 /* Caml_state */
lg C_ARG_1, 0(C_ARG_3) /* %r2 - first arg */
/* %r3 - closure environment */
lg TMP, 0(C_ARG_2) /* code pointer */
brcl 15, 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 r2, r3, r4 and r14 before C call */
lay %r15, -(RESERVED_STACK+32)(%r15)
CFI_ADJUST(RESERVED_STACK+32)
stg C_ARG_1, (RESERVED_STACK+0)(%r15)
stg C_ARG_2, (RESERVED_STACK+8)(%r15)
stg C_ARG_3, (RESERVED_STACK+16)(%r15)
stg %r14, (RESERVED_STACK+24)(%r15)
lgr C_ARG_1, %r14
brasl %r14, GCALL(__tsan_func_entry)
lg %r14, (RESERVED_STACK+24)(%r15)
lg C_ARG_3, (RESERVED_STACK+16)(%r15)
lg C_ARG_2, (RESERVED_STACK+8)(%r15)
lg C_ARG_1, (RESERVED_STACK+0)(%r15)
la %r15, (RESERVED_STACK+32)(%r15)
CFI_ADJUST(-(RESERVED_STACK+32))
#endif
/* Initial shuffling of arguments */
/* (%r2 = Caml_state, %r3 = closure, 0(%r4) = arg1, 8(%r4) = arg2) */
lgr TMP3, C_ARG_1 /* Caml_state */
lgr TMP, C_ARG_2
lg C_ARG_1, 0(C_ARG_3) /* first argument */
lg C_ARG_2, 8(C_ARG_3) /* second argument */
lgr C_ARG_3, TMP /* closure */
LEA_VAR(caml_apply2, TMP) /* code pointer */
brcl 15, 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 r2, r3, r4 and r14 before C call */
lay %r15, -(RESERVED_STACK+32)(%r15)
CFI_ADJUST(RESERVED_STACK+32)
stg C_ARG_1, (RESERVED_STACK+0)(%r15)
stg C_ARG_2, (RESERVED_STACK+8)(%r15)
stg C_ARG_3, (RESERVED_STACK+16)(%r15)
stg %r14, (RESERVED_STACK+24)(%r15)
lgr C_ARG_1, %r14
brasl %r14, GCALL(__tsan_func_entry)
lg %r14, (RESERVED_STACK+24)(%r15)
lg C_ARG_3, (RESERVED_STACK+16)(%r15)
lg C_ARG_2, (RESERVED_STACK+8)(%r15)
lg C_ARG_1, (RESERVED_STACK+0)(%r15)
la %r15, (RESERVED_STACK+32)(%r15)
CFI_ADJUST(-(RESERVED_STACK+32))
#endif
/* Initial shuffling of arguments */
/* (%r2 = Caml_state, %r3 = closure, 0(%r4) = arg1, 8(%r4) = arg2,
16(%r4) = arg3) */
lgr TMP3, C_ARG_1 /* Caml_state */
lgr C_ARG_4, C_ARG_2 /* closure */
lg C_ARG_1, 0(C_ARG_3) /* first argument */
lg C_ARG_2, 8(C_ARG_3) /* second argument */
lg C_ARG_3, 16(C_ARG_3) /* third argument */
LEA_VAR(caml_apply3, TMP) /* code pointer */
brcl 15, 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
/* %r2: effect to perform
%r3: freshly allocated continuation */
lg %r4, Caml_state(current_stack) /* %r4 := old stack */
lay %r5, 1(%r4) /* %r5 (last_fiber) := Val_ptr(old stack) */
stg %r5, 0(%r3) /* Initialise continuation */
LBL(do_perform):
/* %r2: effect to perform
%r3: continuation
%r4: old_stack
%r5: last_fiber */
#if defined(WITH_THREAD_SANITIZER)
/* Signal to TSan all stack frames exited by the perform. */
TSAN_SAVE_CALLER_REGS
lgr C_ARG_1, %r14 /* arg1: pc of perform */
lgr C_ARG_2, %r15 /* arg2: sp of perform */
TSAN_C_CALL(caml_tsan_exit_on_perform)
TSAN_RESTORE_CALLER_REGS
#endif
stg %r5, 8(%r3) /* Set the last fiber field in the continuation */
lg %r9, Stack_handler(%r4) /* %r9 := old stack -> handler */
lg %r8, Handler_parent(%r9)
clgfi %r8, 0 /* %r8 := parent stack; is parent NULL? */
je LBL(112)
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers r2-r5. r8 and r9 are callee-saved
and do not need to be preserved here. */
lay %r15, -32(%r15)
CFI_ADJUST(32)
stg C_ARG_1, 0(%r15)
stg C_ARG_2, 8(%r15)
stg C_ARG_3, 16(%r15)
stg C_ARG_4, 24(%r15)
/* Match the TSan-enter made from caml_runstack */
TSAN_EXIT_FUNCTION
lg C_ARG_4, 24(%r15)
lg C_ARG_3, 16(%r15)
lg C_ARG_2, 8(%r15)
lg C_ARG_1, 0(%r15)
la %r15, 32(%r15)
CFI_ADJUST(-32)
#endif
SWITCH_OCAML_STACKS(%r4, %r8)
/* We have to null the Handler_parent after the switch because the
Handler_parent is needed to unwind the stack for backtraces */
lgfi %r0, 0
stg %r0, Handler_parent(%r9) /* Set parent of performer to NULL */
lgr %r4, %r5 /* %r4 = last_fiber */
lg %r5, Handler_effect(%r9) /* %r5 := effect handler */
brcl 15, GCALL(caml_apply3)
LBL(112):
/* Switch back to original performer before raising Unhandled
(no-op unless this is a reperform) */
lg %r8, 0(%r3) /* load performer stack from continuation */
lay %r8, -1(%r8) /* r8 := Ptr_val(r8) */
lg %r9, Caml_state(current_stack)
SWITCH_OCAML_STACKS(%r9, %r8)
#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 will re-enter
them immediately via caml_tsan_entry_on_resume below. */
TSAN_SAVE_CALLER_REGS
lgr C_ARG_1, %r14 /* arg1: pc of perform */
lgr C_ARG_2, %r15 /* arg2: sp of perform */
lgr C_ARG_3, %r8 /* arg3: performer stack */
TSAN_C_CALL(caml_tsan_entry_on_resume)
TSAN_RESTORE_CALLER_REGS
#endif
/* No parent stack. Raise Unhandled. */
LEA_VAR(caml_raise_unhandled_effect, ADDITIONAL_ARG)
brcl 15, GCALL(caml_c_call)
CFI_ENDPROC
ENDFUNCTION(G(caml_perform))
FUNCTION(G(caml_reperform))
CFI_STARTPROC
/* %r2: effect to reperform
%r3: continuation
%r4: last_fiber */
lg TMP, (Stack_handler-1)(%r4)
lg %r4, Caml_state(current_stack) /* %r4 := old stack */
stg %r4, Handler_parent(TMP) /* Append to last_fiber */
lay %r5, 1(%r4) /* %r5 (last_fiber) := Val_ptr(old stack) */
brcl 15, LBL(do_perform)
CFI_ENDPROC
ENDFUNCTION(G(caml_reperform))
FUNCTION(G(caml_resume))
CFI_STARTPROC
/* %r2 -> new fiber, %r3 -> fun, %r4 -> arg, %r5 -> last_fiber */
lay %r2, -1(%r2) /* %r2 (new stack) = Ptr_val(%r2) */
lg %r6, 0(%r3) /* code pointer */
/* check if stack null, then already used */
cgfi %r2, 0
jz LBL(caml_resume_1)
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers r2-r5 */
lay %r15, -32(%r15)
CFI_ADJUST(32)
stg C_ARG_1, 0(%r15)
stg C_ARG_2, 8(%r15)
stg C_ARG_3, 16(%r15)
stg C_ARG_4, 24(%r15)
/* Necessary to include the caller of caml_resume in the TSan backtrace */
TSAN_ENTER_FUNCTION
lg C_ARG_4, 24(%r15)
lg C_ARG_3, 16(%r15)
lg C_ARG_2, 8(%r15)
lg C_ARG_1, 0(%r15)
la %r15, 32(%r15)
CFI_ADJUST(-32)
TSAN_SAVE_CALLER_REGS
/* Signal to TSan all stack frames exited by the perform. */
lgr C_ARG_3, %r2 /* arg3: fiber */
lg C_ARG_2, Stack_sp(%r2)
lg C_ARG_1, 0(C_ARG_2) /* arg1: pc of perform */
/* This stack address adjustment is required to compensate the
saving of r14 in SWITCH_OCAML_STACKS, which causes Stack_sp()
to be 8 bytes lower than expected. */
la C_ARG_2, 8(C_ARG_2) /* arg2: sp of raise */
TSAN_C_CALL(caml_tsan_entry_on_resume)
TSAN_RESTORE_CALLER_REGS
/* Reload lost value of %r6 */
lg %r6, 0(%r3) /* code pointer */
#endif
/* Add current stack to the end */
lg %r8, (Stack_handler-1)(%r5)
lg %r9, Caml_state(current_stack)
stg %r9, Handler_parent(%r8)
/* 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. */
SWITCH_OCAML_STACKS(%r9, %r2)
lgr %r2, %r4
br %r6
LBL(caml_resume_1):
LEA_VAR(caml_raise_continuation_already_resumed, ADDITIONAL_ARG)
brcl 15, GCALL(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
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers r2-r4 */
lay %r15, -24(%r15)
CFI_ADJUST(24)
stg C_ARG_1, 0(%r15)
stg C_ARG_2, 8(%r15)
stg C_ARG_3, 16(%r15)
/* Necessary to include the caller of caml_runstack in the TSan backtrace */
TSAN_ENTER_FUNCTION
lg C_ARG_3, 16(%r15)
lg C_ARG_2, 8(%r15)
lg C_ARG_1, 0(%r15)
la %r15, 24(%r15)
CFI_ADJUST(-24)
#endif
CFI_SIGNAL_FRAME
ENTER_FUNCTION
CFI_OFFSET(14, -168)
/* %r2 -> fiber, %r3 -> fun, %r4 -> arg */
lay %r2, -1(%r2) /* %r2 (new stack) = Ptr_val(%r2) */
lg %r5, 0(%r3) /* code pointer */
/* save old stack pointer and exception handler */
lg %r8, Caml_state(current_stack) /* %r8 = old stack */
stg %r15, Stack_sp(%r8)
stg TRAP_PTR, Stack_exception(%r8)
/* Load new stack pointer and set parent */
lg TMP, Stack_handler(%r2)
stg %r8, Handler_parent(TMP)
stg %r2, Caml_state(current_stack)
lg %r9, Stack_sp(%r2) /* %r9 = sp of new stack */
/* Create an exception handler on the target stack
after 16byte DWARF & gc_regs block (which is unused here) */
lay %r9, -32(%r9)
larl TMP, LBL(fiber_exn_handler)
stg TMP, 8(%r9)
/* link the previous exn_handler so that copying stacks works */
lg TMP, Stack_exception(%r2)
stg TMP, 0(%r9)
lgr TRAP_PTR, %r9
/* Switch to the new stack */
lgr %r15, %r9
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
.cfi_escape DW_CFA_def_cfa_expression, 3+3+2, \
DW_OP_breg + DW_REG_r15, \
caml_runstack_sleb128_1byte, \
DW_OP_deref, \
DW_OP_plus_uconst, Stack_sp, DW_OP_deref, \
DW_OP_plus_uconst, RETADDR_ENTRY_SIZE
#endif
/* Call the function on the new stack */
lgr %r2, %r4 /* first argument */
basr %r14, %r5 /* closure in %r3 (second argument) */
LBL(frame_runstack):
lay %r8, 32(%r15) /*%r8 = stack_handler */
lg %r7, Handler_value(%r8) /* saved across C call */
LBL(caml_runstack_1):
lgr %r12, %r2 /* save return across C call */
lg %r2, Caml_state(current_stack)
/* restore parent stack and exn_handler into Caml_state */
lg TMP, Handler_parent(%r8)
stg TMP, Caml_state(current_stack)
lg TRAP_PTR, Stack_exception(TMP)
stg TRAP_PTR, Caml_state(exn_handler)
/* free old stack by switching directly to c_stack; is a no-alloc call */
lg %r9, Stack_sp(TMP) /* saved across C call */
CFI_RESTORE_STATE
CFI_REMEMBER_STATE
CFI_DEF_CFA_REGISTER(DW_REG_r9)
lg %r15, Caml_state(c_stack)
PREPARE_FOR_C_CALL
CFI_ADJUST(RESERVED_STACK)
brasl %r14, GCALL(caml_free_stack)
CLEANUP_AFTER_C_CALL
/* switch directly to parent stack */
lgr %r15, %r9
CFI_RESTORE_STATE
#if defined(WITH_THREAD_SANITIZER)
/* Signal to TSan that we exit caml_runstack. Theoretically, no registers
need to be saved here, but TSAN_EXIT_FUNCTION uses SWITCH_OCAML_TO_C
which clobbers %r12 (TMP2), so we need to preserve it here. */
lay %r15, -8(%r15)
CFI_ADJUST(8)
stg %r12, 0(%r15)
TSAN_EXIT_FUNCTION
lg %r12, 0(%r15)
la %r15, 8(%r15)
CFI_ADJUST(-8)
#endif
lgr %r2, %r12
lgr %r3, %r7
lg TMP, 0(%r3) /* code pointer */
/* Invoke handle_value (or handle_exn) */
LEAVE_FUNCTION
br TMP
LBL(fiber_exn_handler):
lay %r8, 16(%r15)
lg %r7, Handler_exception(%r8)
brcl 15, LBL(caml_runstack_1)
CFI_ENDPROC
ENDFUNCTION(G(caml_runstack))
FUNCTION(G(caml_ml_array_bound_error))
CFI_STARTPROC
ENTER_FUNCTION
CFI_OFFSET(14, -168)
/* No registers require saving before C call to TSan */
TSAN_ENTER_FUNCTION
LEA_VAR(caml_array_bound_error_asm, ADDITIONAL_ARG)
/* Note the following jumps in the middle of caml_c_call, since stack
has already been adjusted. */
brcl 15, LBL(caml_c_call)
CFI_ENDPROC
ENDFUNCTION(G(caml_ml_array_bound_error))
TEXT_SECTION(caml_system__code_end)
.globl caml_system__code_end
caml_system__code_end:
/* Frametable - GC roots for callback */
/* Uses the same naming convention as ocamlopt generated modules. */
.section ".data"
OBJECT(caml_system.frametable)
.quad 2 /* two descriptors */
.quad LBL(caml_retaddr) /* return address into callback */
.short -1 /* negative size count => use callback link */
.short 0 /* no roots here */
.align 8
.quad LBL(frame_runstack) /* return address into fiber_val_handler */
.short -1 /* negative size count => use callback link */
.short 0 /* no roots here */
.align 8
ENDOBJECT(caml_system.frametable)
NONEXECSTACK_NOTE
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