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|
/**************************************************************************/
/* */
/* OCaml */
/* */
/* Nicolas Ojeda Bar <n.oje.bar@gmail.com> */
/* */
/* Copyright 2016 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, RISC-V processor, 64-bit mode */
/* Must be preprocessed by cpp */
#include "caml/m.h"
#define DOMAIN_STATE_PTR s11
#define TRAP_PTR s1
#define ALLOC_PTR s10
#define ADDITIONAL_ARG t2
#define STACK_ARG_BEGIN s3
#define STACK_ARG_END s4
#define TMP t0
#define TMP2 t1
#define C_ARG_1 a0
#define C_ARG_2 a1
#define C_ARG_3 a2
#define C_ARG_4 a3
/* DWARF
These RISC-V specific register numbers come from
Table 19. "DWARF register number encodings" of:
RISC-V ABIs Specification, Document Version 1.0
https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases/tag/v1.0
*/
#define DW_REG_s4 20
#define DW_REG_sp 2
.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)(DOMAIN_STATE_PTR)
#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
/* Globals and labels */
#define L(lbl) .L##lbl
#define FUNCTION(name) \
TEXT_SECTION(name); \
.align 2; \
.globl name; \
.type name, @function; \
name:; \
CFI_STARTPROC
#define END_FUNCTION(name) \
CFI_ENDPROC; \
.size name, .-name
#if defined(__PIC__)
.option pic
#define PLT(r) r@plt
#else
.option nopic
#define PLT(r) r
#endif
#define OBJECT(name) \
.data; \
.align 3; \
.globl name; \
.type name, @object; \
name:
#define END_OBJECT(name) \
.size name, .-name
#include "../runtime/caml/asm.h"
/* Function prologue and epilogue */
.macro ENTER_FUNCTION
CFI_OFFSET(ra, -8)
addi sp, sp, -16
sd ra, 8(sp)
CFI_ADJUST(16)
.endm
.macro LEAVE_FUNCTION
ld ra, 8(sp)
addi sp, sp, 16
CFI_ADJUST(-16)
.endm
/* Stack switching operations */
/* struct stack_info */
#define Stack_sp(reg) 0(reg)
#define Stack_sp_offset 0
#define Stack_exception(reg) 8(reg)
#define Stack_handler(reg) 16(reg)
#define Stack_handler_from_cont(reg) 15(reg)
/* struct c_stack_link */
#define Cstack_stack(reg) 0(reg)
#define Cstack_sp(reg) 8(reg)
#define Cstack_sp_offset 8
#define Cstack_prev(reg) 16(reg)
/* struct stack_handler */
#define Handler_value(reg) 0(reg)
#define Handler_exception(reg) 8(reg)
#define Handler_effect(reg) 16(reg)
#define Handler_parent(reg) 24(reg)
#define Handler_parent_offset 24
/* Switch from OCaml to C stack. */
.macro SWITCH_OCAML_TO_C
/* Fill in Caml_state->current_stack->sp */
ld TMP, Caml_state(current_stack)
sd sp, Stack_sp(TMP)
/* Fill in Caml_state->c_stack */
ld TMP2, Caml_state(c_stack)
sd TMP, Cstack_stack(TMP2)
sd sp, Cstack_sp(TMP2)
/* Switch to C stack */
mv sp, TMP2
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
/* sp points to the c_stack_link. */
.cfi_escape DW_CFA_def_cfa_expression, 5, \
DW_OP_breg + DW_REG_sp, Cstack_sp_offset, DW_OP_deref, \
DW_OP_plus_uconst, 16 /* fp + retaddr */
#endif
.endm
/* Switch from C to OCaml stack. */
.macro SWITCH_C_TO_OCAML
ld sp, Cstack_sp(sp)
CFI_RESTORE_STATE
.endm
/* 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)
*/
.macro SAVE_ALL_REGS
/* First, save the young_ptr & exn_handler */
sd ALLOC_PTR, Caml_state(young_ptr)
sd TRAP_PTR, Caml_state(exn_handler)
/* Now, use TMP to point to the gc_regs bucket */
ld TMP, Caml_state(gc_regs_buckets)
ld TMP2, 0(TMP) /* next ptr */
sd TMP2, Caml_state(gc_regs_buckets)
/* Save allocatable integer registers */
sd a0, (2*8)(TMP)
sd a1, (3*8)(TMP)
sd a2, (4*8)(TMP)
sd a3, (5*8)(TMP)
sd a4, (6*8)(TMP)
sd a5, (7*8)(TMP)
sd a6, (8*8)(TMP)
sd a7, (9*8)(TMP)
sd s2, (10*8)(TMP)
sd s3, (11*8)(TMP)
sd s4, (12*8)(TMP)
sd s5, (13*8)(TMP)
sd s6, (14*8)(TMP)
sd s7, (15*8)(TMP)
sd s8, (16*8)(TMP)
sd s9, (17*8)(TMP)
sd t2, (18*8)(TMP)
sd t3, (19*8)(TMP)
sd t4, (20*8)(TMP)
sd t5, (21*8)(TMP)
sd t6, (22*8)(TMP)
sd s0, (23*8)(TMP)
/* Save caller-save floating-point registers
(callee-saves are preserved by C functions) */
fsd ft0, (24*8)(TMP)
fsd ft1, (25*8)(TMP)
fsd ft2, (26*8)(TMP)
fsd ft3, (27*8)(TMP)
fsd ft4, (28*8)(TMP)
fsd ft5, (29*8)(TMP)
fsd ft6, (30*8)(TMP)
fsd ft7, (31*8)(TMP)
fsd fa0, (32*8)(TMP)
fsd fa1, (33*8)(TMP)
fsd fa2, (34*8)(TMP)
fsd fa3, (35*8)(TMP)
fsd fa4, (36*8)(TMP)
fsd fa5, (37*8)(TMP)
fsd fa6, (38*8)(TMP)
fsd fa7, (39*8)(TMP)
fsd ft8, (40*8)(TMP)
fsd ft9, (41*8)(TMP)
fsd ft10, (42*8)(TMP)
fsd ft11, (43*8)(TMP)
addi TMP, TMP, 16
sd TMP, Caml_state(gc_regs)
.endm
/* Undo SAVE_ALL_REGS by loading the registers saved in Caml_state(gc_regs)
and refreshing ALLOC_PTR & TRAP_PTR from Caml_state */
.macro RESTORE_ALL_REGS
/* Restore a0, a1, freeing up the next ptr slot */
ld TMP, Caml_state(gc_regs)
addi TMP, TMP, -16
/* Restore registers */
ld a0, (2*8)(TMP)
ld a1, (3*8)(TMP)
ld a2, (4*8)(TMP)
ld a3, (5*8)(TMP)
ld a4, (6*8)(TMP)
ld a5, (7*8)(TMP)
ld a6, (8*8)(TMP)
ld a7, (9*8)(TMP)
ld s2, (10*8)(TMP)
ld s3, (11*8)(TMP)
ld s4, (12*8)(TMP)
ld s5, (13*8)(TMP)
ld s6, (14*8)(TMP)
ld s7, (15*8)(TMP)
ld s8, (16*8)(TMP)
ld s9, (17*8)(TMP)
ld t2, (18*8)(TMP)
ld t3, (19*8)(TMP)
ld t4, (20*8)(TMP)
ld t5, (21*8)(TMP)
ld t6, (22*8)(TMP)
ld s0, (23*8)(TMP)
fld ft0, (24*8)(TMP)
fld ft1, (25*8)(TMP)
fld ft2, (26*8)(TMP)
fld ft3, (27*8)(TMP)
fld ft4, (28*8)(TMP)
fld ft5, (29*8)(TMP)
fld ft6, (30*8)(TMP)
fld ft7, (31*8)(TMP)
fld fa0, (32*8)(TMP)
fld fa1, (33*8)(TMP)
fld fa2, (34*8)(TMP)
fld fa3, (35*8)(TMP)
fld fa4, (36*8)(TMP)
fld fa5, (37*8)(TMP)
fld fa6, (38*8)(TMP)
fld fa7, (39*8)(TMP)
fld ft8, (40*8)(TMP)
fld ft9, (41*8)(TMP)
fld ft10, (42*8)(TMP)
fld ft11, (43*8)(TMP)
/* Put gc_regs struct back in bucket linked list */
ld TMP2, Caml_state(gc_regs_buckets)
sd TMP2, 0(TMP) /* next ptr */
sd TMP, Caml_state(gc_regs_buckets)
/* Reload new allocation pointer & exn handler */
ld ALLOC_PTR, Caml_state(young_ptr)
ld TRAP_PTR, Caml_state(exn_handler)
.endm
#if defined(WITH_THREAD_SANITIZER) /* { */
/* Invoke a C function, switching back and forth the OCaml and C stacks. */
.macro TSAN_C_CALL fun
SWITCH_OCAML_TO_C
ENTER_FUNCTION
call PLT(\fun)
LEAVE_FUNCTION
SWITCH_C_TO_OCAML
.endm
/* Invoke __tsan_func_entry(return address in the caller) */
.macro TSAN_ENTER_FUNCTION
mv a0, ra /* arg1: return address in caller */
TSAN_C_CALL __tsan_func_entry
.endm
/* Invoke __tsan_func_exit(0) */
.macro TSAN_EXIT_FUNCTION
mv a0, x0
TSAN_C_CALL __tsan_func_exit
.endm
/* This is similar to SAVE_ALL_REGS, but only saving the caller-saved
registers. */
.macro TSAN_SAVE_CALLER_REGS
/* First, save the young_ptr & exn_handler */
sd ALLOC_PTR, Caml_state(young_ptr)
sd TRAP_PTR, Caml_state(exn_handler)
/* Now, use TMP to point to the gc_regs bucket */
ld TMP, Caml_state(gc_regs_buckets)
ld TMP2, 0(TMP) /* next ptr */
sd TMP2, Caml_state(gc_regs_buckets)
/* Save allocatable integer registers */
sd a0, (2*8)(TMP)
sd a1, (3*8)(TMP)
sd a2, (4*8)(TMP)
sd a3, (5*8)(TMP)
sd a4, (6*8)(TMP)
sd a5, (7*8)(TMP)
sd a6, (8*8)(TMP)
sd a7, (9*8)(TMP)
sd t2, (18*8)(TMP)
sd t3, (19*8)(TMP)
sd t4, (20*8)(TMP)
sd t5, (21*8)(TMP)
sd t6, (22*8)(TMP)
/* Save caller-save floating-point registers
(callee-saves are preserved by C functions) */
fsd ft0, (24*8)(TMP)
fsd ft1, (25*8)(TMP)
fsd ft2, (26*8)(TMP)
fsd ft3, (27*8)(TMP)
fsd ft4, (28*8)(TMP)
fsd ft5, (29*8)(TMP)
fsd ft6, (30*8)(TMP)
fsd ft7, (31*8)(TMP)
fsd fa0, (32*8)(TMP)
fsd fa1, (33*8)(TMP)
fsd fa2, (34*8)(TMP)
fsd fa3, (35*8)(TMP)
fsd fa4, (36*8)(TMP)
fsd fa5, (37*8)(TMP)
fsd fa6, (38*8)(TMP)
fsd fa7, (39*8)(TMP)
fsd ft8, (40*8)(TMP)
fsd ft9, (41*8)(TMP)
fsd ft10, (42*8)(TMP)
fsd ft11, (43*8)(TMP)
addi TMP, TMP, 16
sd TMP, Caml_state(gc_regs)
.endm
/* This is similar to RESTORE_ALL_REGS, but only restoring the caller-saved
registers. */
.macro TSAN_RESTORE_CALLER_REGS
/* Restore a0, a1, freeing up the next ptr slot */
ld TMP, Caml_state(gc_regs)
addi TMP, TMP, -16
/* Restore registers */
ld a0, (2*8)(TMP)
ld a1, (3*8)(TMP)
ld a2, (4*8)(TMP)
ld a3, (5*8)(TMP)
ld a4, (6*8)(TMP)
ld a5, (7*8)(TMP)
ld a6, (8*8)(TMP)
ld a7, (9*8)(TMP)
ld t2, (18*8)(TMP)
ld t3, (19*8)(TMP)
ld t4, (20*8)(TMP)
ld t5, (21*8)(TMP)
ld t6, (22*8)(TMP)
fld ft0, (24*8)(TMP)
fld ft1, (25*8)(TMP)
fld ft2, (26*8)(TMP)
fld ft3, (27*8)(TMP)
fld ft4, (28*8)(TMP)
fld ft5, (29*8)(TMP)
fld ft6, (30*8)(TMP)
fld ft7, (31*8)(TMP)
fld fa0, (32*8)(TMP)
fld fa1, (33*8)(TMP)
fld fa2, (34*8)(TMP)
fld fa3, (35*8)(TMP)
fld fa4, (36*8)(TMP)
fld fa5, (37*8)(TMP)
fld fa6, (38*8)(TMP)
fld fa7, (39*8)(TMP)
fld ft8, (40*8)(TMP)
fld ft9, (41*8)(TMP)
fld ft10, (42*8)(TMP)
fld ft11, (43*8)(TMP)
/* Put gc_regs struct back in bucket linked list */
ld TMP2, Caml_state(gc_regs_buckets)
sd TMP2, 0(TMP) /* next ptr */
sd TMP, Caml_state(gc_regs_buckets)
/* Reload new allocation pointer & exn handler */
ld ALLOC_PTR, Caml_state(young_ptr)
ld TRAP_PTR, Caml_state(exn_handler)
.endm
#else /* } { */
.macro TSAN_ENTER_FUNCTION
.endm
.macro TSAN_EXIT_FUNCTION
.endm
.macro TSAN_SAVE_CALLER_REGS
.endm
.macro TSAN_RESTORE_CALLER_REGS
.endm
#endif /* } WITH_THREAD_SANITIZER */
/* Invoke the garbage collector. */
TEXT_SECTION(caml_system__code_begin)
.globl caml_system__code_begin
caml_system__code_begin:
FUNCTION(caml_call_realloc_stack)
CFI_SIGNAL_FRAME
/* Save return address */
ENTER_FUNCTION
/* Save all registers (including ALLOC_PTR & TRAP_PTR) */
SAVE_ALL_REGS
ld C_ARG_1, 16(sp) /* argument */
SWITCH_OCAML_TO_C
call PLT(caml_try_realloc_stack)
SWITCH_C_TO_OCAML
beqz a0, 1f
RESTORE_ALL_REGS
/* Free stack space and return to caller */
LEAVE_FUNCTION
ret
1: RESTORE_ALL_REGS
/* Raise the Stack_overflow exception */
LEAVE_FUNCTION
addi sp, sp, 16 /* pop argument */
la a0, caml_exn_Stack_overflow
j L(caml_raise_exn)
END_FUNCTION(caml_call_realloc_stack)
FUNCTION(caml_call_gc)
L(caml_call_gc):
CFI_SIGNAL_FRAME
/* Save return address */
ENTER_FUNCTION
/* Store all registers (including ALLOC_PTR & TRAP_PTR) */
SAVE_ALL_REGS
TSAN_ENTER_FUNCTION
SWITCH_OCAML_TO_C
/* Call the garbage collector */
call PLT(caml_garbage_collection)
SWITCH_C_TO_OCAML
TSAN_EXIT_FUNCTION
RESTORE_ALL_REGS
/* Free stack space and return to caller */
LEAVE_FUNCTION
ret
END_FUNCTION(caml_call_gc)
FUNCTION(caml_alloc1)
ld TMP, Caml_state(young_limit)
addi ALLOC_PTR, ALLOC_PTR, -16
bltu ALLOC_PTR, TMP, L(caml_call_gc)
ret
END_FUNCTION(caml_alloc1)
FUNCTION(caml_alloc2)
ld TMP, Caml_state(young_limit)
addi ALLOC_PTR, ALLOC_PTR, -24
bltu ALLOC_PTR, TMP, L(caml_call_gc)
ret
END_FUNCTION(caml_alloc2)
FUNCTION(caml_alloc3)
ld TMP, Caml_state(young_limit)
addi ALLOC_PTR, ALLOC_PTR, -32
bltu ALLOC_PTR, TMP, L(caml_call_gc)
ret
END_FUNCTION(caml_alloc3)
FUNCTION(caml_allocN)
ld TMP, Caml_state(young_limit)
sub ALLOC_PTR, ALLOC_PTR, ADDITIONAL_ARG
bltu ALLOC_PTR, TMP, L(caml_call_gc)
ret
END_FUNCTION(caml_allocN)
/* Call a C function from OCaml */
/* Function to call is in ADDITIONAL_ARG */
.macro RET_FROM_C_CALL
ld TMP, Caml_state(action_pending)
bnez TMP, 1f
ret
1: li TMP, -1
sd TMP, Caml_state(young_limit)
ret
.endm
FUNCTION(caml_c_call)
L(caml_c_call):
CFI_SIGNAL_FRAME
ENTER_FUNCTION
TSAN_SAVE_CALLER_REGS
TSAN_ENTER_FUNCTION
TSAN_RESTORE_CALLER_REGS
/* Switch form OCaml to C */
SWITCH_OCAML_TO_C
/* Make the exception handler alloc ptr available to the C code */
sd ALLOC_PTR, Caml_state(young_ptr)
sd TRAP_PTR, Caml_state(exn_handler)
/* Call the function */
jalr ADDITIONAL_ARG
/* Reload new allocation pointer & exn handler */
ld ALLOC_PTR, Caml_state(young_ptr)
ld TRAP_PTR, Caml_state(exn_handler)
/* Load ocaml stack */
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 a0
or fa0:fa1. */
addi sp, sp, -32
CFI_ADJUST(32)
sd a0, 0(sp)
fsd fa0, 16(sp)
fsd fa1, 24(sp)
TSAN_EXIT_FUNCTION
/* Restore return value registers */
fld fa1, 24(sp)
fld fa0, 16(sp)
ld a0, 0(sp)
addi sp, sp, 32
CFI_ADJUST(-32)
#endif
/* Return */
LEAVE_FUNCTION
RET_FROM_C_CALL
END_FUNCTION(caml_c_call)
FUNCTION(caml_c_call_stack_args)
CFI_SIGNAL_FRAME
/* Arguments:
C arguments : a0 to a7, fa0 to fa7
C function : ADDITIONAL_ARG
C stack args : begin=STACK_ARG_BEGIN
end=STACK_ARG_END */
ENTER_FUNCTION
/* Switch from OCaml to C */
SWITCH_OCAML_TO_C
/* Make the exception handler alloc ptr available to the C code */
sd ALLOC_PTR, Caml_state(young_ptr)
sd TRAP_PTR, Caml_state(exn_handler)
/* Store sp to restore after call */
mv s2, sp
/* Copy arguments from OCaml to C stack
NB: STACK_ARG_END - STACK_ARG_BEGIN is a multiple of 16 */
1: addi STACK_ARG_END, STACK_ARG_END, -16
bltu STACK_ARG_END, STACK_ARG_BEGIN, 2f
ld TMP, 0(STACK_ARG_END)
ld TMP2, 8(STACK_ARG_END)
addi sp, sp, -16
sd TMP, 0(sp)
sd TMP2, 8(sp)
CFI_ADJUST(16)
j 1b
2: /* Call the function */
jalr ADDITIONAL_ARG
/* Restore stack */
mv sp, s2
/* Reload new allocation pointer & exn handler */
ld ALLOC_PTR, Caml_state(young_ptr)
ld TRAP_PTR, Caml_state(exn_handler)
/* Switch from C to OCaml */
SWITCH_C_TO_OCAML
/* Return */
LEAVE_FUNCTION
RET_FROM_C_CALL
END_FUNCTION(caml_c_call_stack_args)
/* Start the OCaml program */
FUNCTION(caml_start_program)
CFI_SIGNAL_FRAME
#if defined(WITH_THREAD_SANITIZER)
addi sp, sp, -16
CFI_ADJUST(16)
sd a0, 0(sp)
/* We can't use the TSAN_ENTER_FUNCTION macro here, as it assumes to run
on an OCaml stack, yet we are still on a C stack at this point. */
mv a0, ra
ENTER_FUNCTION
call PLT(__tsan_func_entry)
LEAVE_FUNCTION
ld a0, 0(sp)
addi sp, sp, 16
CFI_ADJUST(-16)
#endif
/* domain state is passed as arg from C */
mv TMP, C_ARG_1
la TMP2, caml_program
/* Code shared with caml_callback* */
/* Address of domain state is in TMP */
/* Address of OCaml code to call is in TMP2 */
/* Arguments to the OCaml code are in a0...a7 */
L(jump_to_caml):
/* Set up stack frame and save callee-save registers */
CFI_OFFSET(s0, -208)
CFI_OFFSET(ra, -200)
addi sp, sp, -208
sd s0, 0(sp)
sd ra, 8(sp)
CFI_ADJUST(208)
sd s0, (2*8)(sp)
sd s1, (3*8)(sp)
sd s2, (4*8)(sp)
sd s3, (5*8)(sp)
sd s4, (6*8)(sp)
sd s5, (7*8)(sp)
sd s6, (8*8)(sp)
sd s7, (9*8)(sp)
sd s8, (10*8)(sp)
sd s9, (11*8)(sp)
sd s10, (12*8)(sp)
sd s11, (13*8)(sp)
fsd fs0, (14*8)(sp)
fsd fs1, (15*8)(sp)
fsd fs2, (16*8)(sp)
fsd fs3, (17*8)(sp)
fsd fs4, (18*8)(sp)
fsd fs5, (19*8)(sp)
fsd fs6, (20*8)(sp)
fsd fs7, (21*8)(sp)
fsd fs8, (22*8)(sp)
fsd fs9, (23*8)(sp)
fsd fs10, (24*8)(sp)
fsd fs11, (25*8)(sp)
/* Load domain state pointer from argument */
mv DOMAIN_STATE_PTR, TMP
/* Reload allocation pointer */
ld ALLOC_PTR, Caml_state(young_ptr)
/* Build (16-byte aligned) struct c_stack_link on the C stack */
ld t2, Caml_state(c_stack)
addi sp, sp, -32
CFI_ADJUST(32)
sd t2, Cstack_prev(sp)
sd x0, Cstack_stack(sp)
sd x0, Cstack_sp(sp)
sd sp, Caml_state(c_stack)
/* Load the OCaml stack */
ld t2, Caml_state(current_stack)
ld t2, Stack_sp(t2)
/* Store the gc_regs for callbacks during a GC */
ld t3, Caml_state(gc_regs)
addi t2, t2, -8
sd t3, 0(t2)
/* Store the stack pointer to allow DWARF unwind */
addi t2, t2, -8
sd sp, 0(t2) /* C_stack_sp */
/* Setup a trap frame to catch exceptions escaping the OCaml code */
ld t3, Caml_state(exn_handler)
la t4, L(trap_handler)
addi t2, t2, -16
sd t3, 0(t2)
sd t4, 8(t2)
mv TRAP_PTR, t2
/* Switch stacks and call the OCaml code */
mv sp, t2
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
.cfi_escape DW_CFA_def_cfa_expression, 3 + 2 + 2, \
/* sp points to the exn handler on the OCaml stack */ \
/* sp + 16 contains the C_STACK_SP */ \
DW_OP_breg + DW_REG_sp, 16 /* exn handler */, DW_OP_deref, \
/* 32 struct c_stack_link + pad */ \
/* 24*8 callee save regs */ \
/* 16 fp + ret addr */ \
/* need to split to get under 127 limit */ \
DW_OP_plus_uconst, 120, DW_OP_plus_uconst, 120
#endif
/* Call the OCaml code */
jalr TMP2
L(caml_retaddr):
/* Pop the trap frame, restoring Caml_state->exn_handler */
ld t2, 0(sp)
addi sp, sp, 16
CFI_ADJUST(-16)
sd t2, Caml_state(exn_handler)
L(return_result):
/* Restore GC regs */
ld t2, 0(sp)
ld t3, 8(sp)
addi sp, sp, 16
CFI_ADJUST(-16)
sd t3, Caml_state(gc_regs)
/* Update allocation pointer */
sd ALLOC_PTR, Caml_state(young_ptr)
/* Return to C stack */
ld t2, Caml_state(current_stack)
sd sp, Stack_sp(t2)
ld t3, Caml_state(c_stack)
mv sp, t3
CFI_RESTORE_STATE
/* Pop the struct c_stack_link */
ld t2, Cstack_prev(sp)
addi sp, sp, 32
CFI_ADJUST(-32)
sd t2, Caml_state(c_stack)
#if defined(WITH_THREAD_SANITIZER)
/* We can't use the TSAN_EXIT_FUNCTION macro here, as it assumes to run
on an OCaml stack, and we are back to a C stack at this point. */
addi sp, sp, -16
CFI_ADJUST(16)
sd a0, 0(sp)
mv a0, x0
ENTER_FUNCTION
call PLT(__tsan_func_exit)
LEAVE_FUNCTION
ld a0, 0(sp)
addi sp, sp, 16
CFI_ADJUST(-16)
#endif
/* Reload callee-save register and return address */
ld s0, (2*8)(sp)
ld s1, (3*8)(sp)
ld s2, (4*8)(sp)
ld s3, (5*8)(sp)
ld s4, (6*8)(sp)
ld s5, (7*8)(sp)
ld s6, (8*8)(sp)
ld s7, (9*8)(sp)
ld s8, (10*8)(sp)
ld s9, (11*8)(sp)
ld s10, (12*8)(sp)
ld s11, (13*8)(sp)
fld fs0, (14*8)(sp)
fld fs1, (15*8)(sp)
fld fs2, (16*8)(sp)
fld fs3, (17*8)(sp)
fld fs4, (18*8)(sp)
fld fs5, (19*8)(sp)
fld fs6, (20*8)(sp)
fld fs7, (21*8)(sp)
fld fs8, (22*8)(sp)
fld fs9, (23*8)(sp)
fld fs10, (24*8)(sp)
fld fs11, (25*8)(sp)
ld ra, 8(sp)
addi sp, sp, 208
CFI_ADJUST(-208)
/* Return to C caller */
ret
END_FUNCTION(caml_start_program)
/* The trap handler */
.align 2
L(trap_handler):
CFI_STARTPROC
/* Save exception pointer */
sd TRAP_PTR, Caml_state(exn_handler)
/* Encode exception pointer */
ori a0, a0, 2
/* Return it */
j L(return_result)
CFI_ENDPROC
/* Exceptions */
.macro JUMP_TO_TRAP_PTR
/* Cut stack at current trap handler */
mv sp, TRAP_PTR
/* Pop previous handler and jump to it */
ld TMP, 8(sp)
ld TRAP_PTR, 0(sp)
addi sp, sp, 16
jr TMP
.endm
/* Raise an exception from OCaml */
FUNCTION(caml_raise_exn)
L(caml_raise_exn):
/* Test if backtrace is active */
ld TMP, Caml_state(backtrace_active)
bnez TMP, 2f
1:
JUMP_TO_TRAP_PTR
2: /* Zero backtrace_pos */
sd x0, Caml_state(backtrace_pos)
L(caml_reraise_exn_stash):
/* Preserve exception bucket in callee-save register s2 */
mv s2, a0
/* Stash the backtrace */
/* arg1: exn bucket, already in a0 */
mv a1, ra /* arg2: pc of raise */
mv a2, sp /* arg3: sp of raise */
mv a3, TRAP_PTR /* arg4: sp of handler */
/* Switch to C stack */
ld TMP, Caml_state(c_stack)
mv sp, TMP
call PLT(caml_stash_backtrace)
/* Restore exception bucket and raise */
mv a0, s2
j 1b
END_FUNCTION(caml_raise_exn)
FUNCTION(caml_reraise_exn)
ld TMP, Caml_state(backtrace_active)
bnez TMP, L(caml_reraise_exn_stash)
JUMP_TO_TRAP_PTR
END_FUNCTION(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(caml_tsan_exit_on_raise_asm)
mv a0, ra /* arg1: pc of raise */
mv a1, sp /* arg2: sp of raise */
mv a2, TRAP_PTR /* arg3: sp of handler */
TSAN_C_CALL caml_tsan_exit_on_raise
ret
END_FUNCTION(caml_tsan_exit_on_raise_asm)
#endif
/* Raise an exception from C */
FUNCTION(caml_raise_exception)
/* Load the domain state ptr */
mv DOMAIN_STATE_PTR, C_ARG_1
/* Load the exception bucket */
mv a0, C_ARG_2
/* Reload trap ptr and alloc ptr */
ld TRAP_PTR, Caml_state(exn_handler)
ld ALLOC_PTR, Caml_state(young_ptr)
/* Discard the C stack pointer and reset to ocaml stack */
ld TMP, Caml_state(current_stack)
ld TMP, Stack_sp(TMP)
mv sp, TMP
#if defined(WITH_THREAD_SANITIZER)
addi sp, sp, -16
CFI_ADJUST(16)
sd a0, 0(sp) /* preserve exception bucket */
/* Call __tsan_func_exit for every OCaml stack frame exited due to the
exception */
mv a1, TMP
ld a0, 8(a1) /* arg1: pc of raise */
/* This stack address adjustment is required to compensate the
saving of ra in SWITCH_OCAML_STACKS, which causes Stack_sp()
to be 16 bytes lower than expected. */
addi a1, a1, 16 /* arg2: sp of raise */
mv a2, TRAP_PTR /* arg3: sp of handler */
TSAN_C_CALL caml_tsan_exit_on_raise
ld a0, 0(sp)
addi sp, sp, 16
CFI_ADJUST(-16)
#endif
/* Restore frame and link on return to OCaml */
LEAVE_FUNCTION
j L(caml_raise_exn)
END_FUNCTION(caml_raise_exception)
/* Callback from C to OCaml */
FUNCTION(caml_callback_asm)
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers a0, a1, a2 and ra before C call */
addi sp, sp, -32
CFI_ADJUST(32)
sd a0, 0(sp)
sd a1, 8(sp)
sd a2, 16(sp)
sd ra, 24(sp)
mv a0, ra
call PLT(__tsan_func_entry)
ld ra, 24(sp)
ld a2, 16(sp)
ld a1, 8(sp)
ld a0, 0(sp)
addi sp, sp, 32
CFI_ADJUST(-32)
#endif
/* Initial shuffling of arguments */
/* (a0 = Caml_state, a1 = closure, 0(a2) = first arg) */
mv TMP, a0
ld a0, 0(a2) /* a0 = first arg */
/* a1 = closure environment */
ld TMP2, 0(a1) /* code pointer */
j L(jump_to_caml)
END_FUNCTION(caml_callback_asm)
FUNCTION(caml_callback2_asm)
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers a0, a1, a2 and ra before C call */
addi sp, sp, -32
CFI_ADJUST(32)
sd a0, 0(sp)
sd a1, 8(sp)
sd a2, 16(sp)
sd ra, 24(sp)
mv a0, ra
call PLT(__tsan_func_entry)
ld ra, 24(sp)
ld a2, 16(sp)
ld a1, 8(sp)
ld a0, 0(sp)
addi sp, sp, 32
CFI_ADJUST(-32)
#endif
/* Initial shuffling of arguments */
/* (a0 = Caml_state, a1 = closure, 0(a2) = arg1, 8(a2) = arg2) */
mv TMP, a0
mv TMP2, a1
ld a0, 0(a2) /* a0 = first arg */
ld a1, 8(a2) /* a1 = second arg */
mv a2, TMP2 /* a2 = closure environment */
la TMP2, caml_apply2
j L(jump_to_caml)
END_FUNCTION(caml_callback2_asm)
FUNCTION(caml_callback3_asm)
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers a0, a1, a2 and ra before C call */
addi sp, sp, -32
CFI_ADJUST(32)
sd a0, 0(sp)
sd a1, 8(sp)
sd a2, 16(sp)
sd ra, 24(sp)
mv a0, ra
call PLT(__tsan_func_entry)
ld ra, 24(sp)
ld a2, 16(sp)
ld a1, 8(sp)
ld a0, 0(sp)
addi sp, sp, 32
CFI_ADJUST(-32)
#endif
/* Initial shuffling of arguments */
/* (a0 = Caml_state, a1 = closure, 0(a2) = arg1, 8(a2) = arg2,
16(a2) = arg3) */
mv TMP, a0
mv a3, a1 /* a3 = closure environment */
ld a0, 0(a2) /* a0 = first arg */
ld a1, 8(a2) /* a1 = second arg */
ld a2, 16(a2) /* a2 = third arg */
la TMP2, caml_apply3
j L(jump_to_caml)
END_FUNCTION(caml_callback3_asm)
/* Fibers */
/* Switch between OCaml stacks. Clobbers TMP and switches TRAP_PTR
Preserves old_stack and new_stack registers */
.macro SWITCH_OCAML_STACKS old_stack, new_stack
/* Save frame pointer and return address for old_stack */
ENTER_FUNCTION
/* Save OCaml SP and exn_handler in the stack info */
sd sp, Stack_sp(\old_stack)
sd TRAP_PTR, Stack_exception(\old_stack)
/* switch stacks */
sd \new_stack, Caml_state(current_stack)
ld TMP, Stack_sp(\new_stack)
mv sp, TMP
/* restore exn_handler for new stack */
ld TRAP_PTR, Stack_exception(\new_stack)
/* Restore frame pointer and return address for new_stack */
LEAVE_FUNCTION
.endm
/*
* 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(caml_perform)
/* a0: effect to perform
a1: freshly allocated continuation */
ld a2, Caml_state(current_stack) /* a2 := old stack */
addi a3, a2, 1 /* a3 := Val_ptr(old stack) */
sd a3, 0(a1) /* Initialize continuation */
L(do_perform):
/* a0: effect to perform
a1: continuation
a2: old_stack
a3: last_fiber */
#if defined(WITH_THREAD_SANITIZER)
/* Signal to TSan all stack frames exited by the perform. */
TSAN_SAVE_CALLER_REGS
mv a0, ra /* arg1: pc of perform */
mv a1, sp /* arg2: sp of perform */
TSAN_C_CALL caml_tsan_exit_on_perform
TSAN_RESTORE_CALLER_REGS
#endif
sd a3, 8(a1) /* Set the last fiber field in the continuation */
ld t3, Stack_handler(a2) /* t3 := old stack -> handler */
ld t4, Handler_parent(t3) /* t4 := parent stack */
beqz t4, 1f
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers a0-a3, t3 and t4 */
addi sp, sp, -48
CFI_ADJUST(48)
sd a0, 0(sp)
sd a1, 8(sp)
sd a2, 16(sp)
sd a3, 24(sp)
sd t3, 32(sp)
sd t4, 40(sp)
/* Match the TSan-enter made from caml_runstack */
TSAN_EXIT_FUNCTION
ld t4, 40(sp)
ld t3, 32(sp)
ld a3, 24(sp)
ld a2, 16(sp)
ld a1, 8(sp)
ld a0, 0(sp)
addi sp, sp, 48
CFI_ADJUST(-48)
#endif
SWITCH_OCAML_STACKS a2, t4
/* we have to null the Handler_parent after the switch because
the Handler_parent is needed to unwind the stack for backtraces */
sd x0, Handler_parent(t3) /* Set parent of performer to NULL */
ld TMP, Handler_effect(t3)
mv a2, a3 /* a2 := last_fiber */
mv a3, TMP /* a3 := effect handler */
tail PLT(caml_apply3)
1:
/* switch back to original performer before raising Effect.Unhandled
(no-op unless this is a reperform) */
ld t4, 0(a1) /* load performer stack from continuation */
addi t4, t4, -1 /* t4 := Ptr_val(t4) */
ld t3, Caml_state(current_stack)
SWITCH_OCAML_STACKS t3, t4
/* No parent stack. Raise Effect.Unhandled. */
#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
mv a0, ra /* arg1: pc of perform */
mv a1, sp /* arg2: sp of perform */
mv a2, t4 /* arg3: performer stack */
TSAN_C_CALL caml_tsan_entry_on_resume
TSAN_RESTORE_CALLER_REGS
#endif
la ADDITIONAL_ARG, caml_raise_unhandled_effect
j L(caml_c_call)
END_FUNCTION(caml_perform)
FUNCTION(caml_reperform)
/* a0: effect to perform
a1: continuation
a2: last_fiber */
ld TMP, Stack_handler_from_cont(a2)
ld a2, Caml_state(current_stack) /* a2 := old stack */
sd a2, Handler_parent(TMP) /* Append to last_fiber */
addi a3, a2, 1 /* a3 (last_fiber) := Val_ptr(old stack) */
j L(do_perform)
END_FUNCTION(caml_reperform)
FUNCTION(caml_resume)
/* a0: new fiber
a1: fun
a2: arg
a3: last_fiber */
addi a0, a0, -1 /* a0 = Ptr_val(a0) */
ld a4, 0(a1) /* code pointer */
/* Check if stack null, then already used */
beqz a0, 1f
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers a0-a4 */
addi sp, sp, -48
CFI_ADJUST(48)
sd a0, 0(sp)
sd a1, 8(sp)
sd a2, 16(sp)
sd a3, 24(sp)
sd a4, 32(sp)
/* Necessary to include the caller of caml_resume in the TSan backtrace */
TSAN_ENTER_FUNCTION
ld a4, 32(sp)
ld a3, 24(sp)
ld a2, 16(sp)
ld a1, 8(sp)
ld a0, 0(sp)
addi sp, sp, 48
CFI_ADJUST(-48)
TSAN_SAVE_CALLER_REGS
/* Signal to TSan all stack frames exited by the perform. */
mv a2, a0 /* arg3: fiber */
ld a1, Stack_sp(a0)
ld a0, 8(a1) /* arg1: pc of perform */
/* This stack address adjustment is required to compensate the
saving of ra in SWITCH_OCAML_STACKS, which causes Stack_sp()
to be 16 bytes lower than expected. */
addi a1, a1, 16 /* arg2: sp at perform */
TSAN_C_CALL caml_tsan_entry_on_resume
TSAN_RESTORE_CALLER_REGS
#endif
/* Add current stack to the end */
addi a3, a3, -1 /* a3 = Ptr_val(a3) */
ld t2, Stack_handler(a3)
ld t3, Caml_state(current_stack)
sd t3, Handler_parent(t2)
SWITCH_OCAML_STACKS t3, a0
mv a0, a2
jr a4
1: la ADDITIONAL_ARG, caml_raise_continuation_already_resumed
j L(caml_c_call)
END_FUNCTION(caml_resume)
/* Run a function on a new stack, then either
return the value or invoke exception handler */
FUNCTION(caml_runstack)
#if defined(WITH_THREAD_SANITIZER)
/* Save non-callee-saved registers a0-a2 */
addi sp, sp, -32
CFI_ADJUST(32)
sd a0, 0(sp)
sd a1, 8(sp)
sd a2, 16(sp)
/* Necessary to include the caller of caml_runstack in the TSan backtrace */
TSAN_ENTER_FUNCTION
ld a2, 16(sp)
ld a1, 8(sp)
ld a0, 0(sp)
addi sp, sp, 32
CFI_ADJUST(-32)
#endif
CFI_SIGNAL_FRAME
/* a0: fiber
a1: fun
a2: arg */
ENTER_FUNCTION
addi a0, a0, -1 /* a0 := Ptr_val(a0) */
ld a3, 0(a1) /* code pointer */
/* save old stack pointer and exception handler */
ld t2, Caml_state(current_stack) /* t2 := old stack */
sd sp, Stack_sp(t2)
sd TRAP_PTR, Stack_exception(t2)
/* Load new stack pointer and set parent */
ld TMP, Stack_handler(a0)
sd t2, Handler_parent(TMP)
sd a0, Caml_state(current_stack)
ld t3, Stack_sp(a0) /* t3 := sp of new stack */
/* Create an exception handler on the target stack
after 16byte DWARF & gc_regs block (which is unused here) */
addi t3, t3, -32
la TMP, L(fiber_exn_handler)
sd TMP, 8(t3)
/* link the previous exn_handler so that copying stacks works */
ld TMP, Stack_exception(a0)
sd TMP, 0(t3)
mv TRAP_PTR, t3
/* Switch to the new stack */
mv sp, t3
#ifdef ASM_CFI_SUPPORTED
CFI_REMEMBER_STATE
.cfi_escape DW_CFA_def_cfa_expression, 3+3+2, \
DW_OP_breg + DW_REG_sp, \
16 /* exn */ + \
8 /* gc_regs slot (unused) */ + \
8 /* C_STACK_SP for DWARF (unused) */ \
+ Handler_parent_offset, DW_OP_deref, \
DW_OP_plus_uconst, Stack_sp_offset, DW_OP_deref, \
DW_OP_plus_uconst, 16 /* fp + ret addr */
#endif
/* Call the function on the new stack */
mv a0, a2
jalr a3
L(frame_runstack):
addi t2, sp, 32 /* t2 := stack_handler */
ld s2, Handler_value(t2) /* saved across C call */
1:
mv s3, a0 /* save return across C call */
ld a0, Caml_state(current_stack) /* arg to caml_free_stack */
/* restore parent stack and exn_handler into Caml_state */
ld TMP, Handler_parent(t2)
sd TMP, Caml_state(current_stack)
ld TRAP_PTR, Stack_exception(TMP)
sd TRAP_PTR, Caml_state(exn_handler)
/* free old stack by switching directly to c_stack;
is a no-alloc call */
ld s4, Stack_sp(TMP) /* saved across C call */
CFI_RESTORE_STATE
CFI_REMEMBER_STATE
CFI_DEF_CFA_REGISTER(DW_REG_s4)
ld TMP, Caml_state(c_stack)
mv sp, TMP
call PLT(caml_free_stack)
/* switch directly to parent stack */
mv sp, s4
CFI_RESTORE_STATE
/* Signal to TSan that we exit caml_runstack (no registers to save here) */
TSAN_EXIT_FUNCTION
/* pick correct return value */
mv a0, s3
mv a1, s2
ld TMP, 0(s2) /* code pointer */
/* Invoke handle_value (or handle_exn) */
LEAVE_FUNCTION
jr TMP
L(fiber_exn_handler):
addi t2, sp, 16 /* t2 := stack_handler */
ld s2, Handler_exception(t2)
j 1b
END_FUNCTION(caml_runstack)
FUNCTION(caml_ml_array_bound_error)
/* Load address of [caml_array_bound_error_asm] in ADDITIONAL_ARG */
la ADDITIONAL_ARG, caml_array_bound_error_asm
/* Call that function */
j L(caml_c_call)
END_FUNCTION(caml_ml_array_bound_error)
TEXT_SECTION(caml_system__code_end)
.globl caml_system__code_end
caml_system__code_end:
/* GC roots for callback */
OBJECT(caml_system.frametable)
.quad 2 /* two descriptors */
.quad L(caml_retaddr) /* return address into callback */
.short -1 /* negative frame size => use callback link */
.short 0 /* no roots */
.align 3
.quad L(frame_runstack) /* return address into fiber handler */
.short -1 /* negative frame size => use callback link */
.short 0 /* no roots */
.align 3
END_OBJECT(caml_system.frametable)
/* Mark stack as non-executable */
.section .note.GNU-stack,"",%progbits
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