/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2001-2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#include "hipe_sparc_asm.h"
#include "hipe_literals.h"
#define ASM
#include "hipe_mode_switch.h"
.section ".text"
.align 4
/*
* Enter Erlang from C.
* Switch to a new register window.
* Create a new frame on the C stack.
* Save C return address in the frame.
* Retrieve the process pointer from the C argument registers.
*/
#define ENTER_FROM_C \
save %sp, -112, %sp; \
st %i7, [%sp+96]
/*
* Return to the calling C function.
* The return value is in %o0.
*
* .flush_exit saves NSP and other cached P state.
* .suspend_exit also saves RA.
*/
.suspend_exit:
/* save RA, so we can be resumed */
st RA, [P+P_NRA]
.flush_exit:
/* restore C return address (hoisted to avoid stall) */
ld [%sp+96], %i7
/* flush cached P state */
SAVE_CACHED_STATE
/* restore callee-save registers, drop frame, return */
jmp %i7+8 /* ret */
restore %g0, %o0, %o0 /* kills P, moves our %o0 to caller's %o0 */
/*
* int hipe_sparc_call_to_native(Process *p);
* Emulated code recursively calls native code.
*/
.global hipe_sparc_call_to_native
.type hipe_sparc_call_to_native, #function
.proc 04 /* ??? */
hipe_sparc_call_to_native:
ENTER_FROM_C
/* prepare to call the target */
ld [P+P_NCALLEE], TEMP_ARG0
/* get argument registers */
LOAD_ARG_REGS
/* cache some P state in registers */
RESTORE_CACHED_STATE
/* FALLTHROUGH
*
* We export this return address so that hipe_mode_switch() can discover
* when native code tailcalls emulated code.
* Note: this is SPARC, so the value in the return address register
* is the address of the call/jmpl instruction itself.
*/
.global nbif_return
nbif_return:
/* call the target */
jmpl TEMP_ARG0, RA
nop
/* FALLTHROUGH
*
* This is where native code returns to emulated code.
*/
st %o0, [P+P_ARG0] /* save retval */
ba .flush_exit
mov HIPE_MODE_SWITCH_RES_RETURN, %o0
/*
* int hipe_sparc_return_to_native(Process *p);
* Emulated code returns to its native code caller.
*/
.global hipe_sparc_return_to_native
.type hipe_sparc_return_to_native, #function
.proc 04 /* ??? */
hipe_sparc_return_to_native:
ENTER_FROM_C
/* restore return address */
ld [P+P_NRA], RA
/* cache some P state in registers */
RESTORE_CACHED_STATE
/*
* Return using the current return address.
* The parameters were popped at the original native-to-emulated
* call (hipe_call_from_native_is_recursive), so a plain ret suffices.
*/
jmp RA+8
ld [P+P_ARG0], %o0 /* delay slot: get return value */
/*
* int hipe_sparc_tailcall_to_native(Process *);
* Emulated code tailcalls native code.
*/
.global hipe_sparc_tailcall_to_native
.type hipe_sparc_tailcall_to_native, #function
.proc 04 /* ??? */
hipe_sparc_tailcall_to_native:
ENTER_FROM_C
/* prepare to call the target */
ld [P+P_NCALLEE], TEMP_ARG0
/* get argument registers */
LOAD_ARG_REGS
/* cache some P state in registers */
RESTORE_CACHED_STATE
/* call the target */
jmp TEMP_ARG0
ld [P+P_NRA], RA /* delay slot: restore return address */
/*
* int hipe_sparc_throw_to_native(Process *p);
* Emulated code throws an exception to its native code caller.
*/
.align 4
.global hipe_sparc_throw_to_native
.type hipe_sparc_throw_to_native, #function
.proc 04 /* ??? */
hipe_sparc_throw_to_native:
ENTER_FROM_C
/* prepare to invoke handler */
ld [P+P_NCALLEE], TEMP_ARG0 /* set by hipe_find_handler() */
/* cache some P state in registers */
RESTORE_CACHED_STATE
/* invoke the handler */
jmp TEMP_ARG0
nop
/*
* Native code calls emulated code via a stub
* which should look as follows:
*
* stub for f/N:
* sethi %hi(f's export entry address), TEMP_ARG0
* mov RA, TEMP_RA ! because the call below clobbers RA (%o7)
* or TEMP_ARG0, %lo(f's export entry address), TEMP_ARG0
* call nbif_callemu ! clobbers RA!
* mov N, TEMP_ARG1 ! delay slot: TEMP_ARG1 := ARITY
*
* XXX. Different stubs for different number of register parameters?
*/
.global nbif_callemu
nbif_callemu:
st TEMP_ARG0, [P+P_CALLEE_EXP]
st TEMP_ARG1, [P+P_ARITY]
st TEMP_RA, [P+P_NRA]
STORE_ARG_REGS
ba .flush_exit
mov HIPE_MODE_SWITCH_RES_CALL_EXPORTED, %o0
/*
* nbif_apply
*/
.global nbif_apply
nbif_apply:
STORE_ARG_REGS
ba .suspend_exit
mov HIPE_MODE_SWITCH_RES_APPLY, %o0
/*
* Native code calls an emulated-mode closure via a stub defined below.
*
* The closure is appended as the last actual parameter, and parameters
* beyond the first few passed in registers are pushed onto the stack in
* left-to-right order.
* Hence, the location of the closure parameter only depends on the number
* of parameters in registers, not the total number of parameters.
*/
#if NR_ARG_REGS >= 6
.global nbif_ccallemu6
nbif_ccallemu6:
st ARG5, [P+P_ARG5]
#if NR_ARG_REGS > 6
mov ARG6, ARG5
#else
ld [NSP+0], ARG5
#endif
/*FALLTHROUGH*/
#endif
#if NR_ARG_REGS >= 5
.global nbif_ccallemu5
nbif_ccallemu5:
st ARG4, [P+P_ARG4]
#if NR_ARG_REGS > 5
mov ARG5, ARG4
#else
ld [NSP+0], ARG4
#endif
/*FALLTHROUGH*/
#endif
#if NR_ARG_REGS >= 4
.global nbif_ccallemu4
nbif_ccallemu4:
st ARG3, [P+P_ARG3]
#if NR_ARG_REGS > 4
mov ARG4, ARG3
#else
ld [NSP+0], ARG3
#endif
/*FALLTHROUGH*/
#endif
#if NR_ARG_REGS >= 3
.global nbif_ccallemu3
nbif_ccallemu3:
st ARG2, [P+P_ARG2]
#if NR_ARG_REGS > 3
mov ARG3, ARG2
#else
ld [NSP+0], ARG2
#endif
/*FALLTHROUGH*/
#endif
#if NR_ARG_REGS >= 2
.global nbif_ccallemu2
nbif_ccallemu2:
st ARG1, [P+P_ARG1]
#if NR_ARG_REGS > 2
mov ARG2, ARG1
#else
ld [NSP+0], ARG1
#endif
/*FALLTHROUGH*/
#endif
#if NR_ARG_REGS >= 1
.global nbif_ccallemu1
nbif_ccallemu1:
st ARG0, [P+P_ARG0]
#if NR_ARG_REGS > 1
mov ARG1, ARG0
#else
ld [NSP+0], ARG0
#endif
/*FALLTHROUGH*/
#endif
.global nbif_ccallemu0
nbif_ccallemu0:
/* We use %o1 not ARG0 here because ARG0 is not
defined when NR_ARG_REGS == 0. */
#if NR_ARG_REGS == 0
ld [NSP+0], %o1 /* get the closure */
#endif
st %o1, [P+P_CLOSURE] /* save the closure */
ba .suspend_exit
mov HIPE_MODE_SWITCH_RES_CALL_CLOSURE, %o0
/*
* This is where native code suspends.
*/
.global nbif_suspend_0
nbif_suspend_0:
ba .suspend_exit
mov HIPE_MODE_SWITCH_RES_SUSPEND, %o0
/*
* Suspend from a receive (waiting for a message)
*/
.global nbif_suspend_msg
nbif_suspend_msg:
ba .suspend_exit
mov HIPE_MODE_SWITCH_RES_WAIT, %o0
/*
* Suspend from a receive with a timeout (waiting for a message)
* if (!(p->flags & F_TIMO)) { suspend }
* else { return 0; }
*/
.global nbif_suspend_msg_timeout
nbif_suspend_msg_timeout:
ld [P+P_FLAGS], %o1
/* this relies on F_TIMO (1<<2) fitting in a simm13 */
andcc %o1, F_TIMO, %g0
bz,a .suspend_exit
mov HIPE_MODE_SWITCH_RES_WAIT_TIMEOUT, %o0 /* delay slot */
/* timeout has occurred */
jmp RA+8
mov 0, %o0
/*
* This is the default exception handler for native code.
*/
.global nbif_fail
nbif_fail:
ba .flush_exit
mov HIPE_MODE_SWITCH_RES_THROW, %o0
.global nbif_0_gc_after_bif
.global nbif_1_gc_after_bif
.global nbif_2_gc_after_bif
.global nbif_3_gc_after_bif
nbif_0_gc_after_bif:
ba .gc_after_bif
mov 0, %o1 /* delay slot */
nbif_1_gc_after_bif:
ba .gc_after_bif
mov 1, %o1 /* delay slot */
nbif_2_gc_after_bif:
ba .gc_after_bif
mov 2, %o1 /* delay slot */
nbif_3_gc_after_bif:
mov 3, %o1
/*FALLTHROUGH*/
.gc_after_bif:
st %o1, [P+P_NARITY]
st TEMP_RA, [P+P_NRA]
st NSP, [P+P_NSP]
mov RA, TEMP_RA
mov 0, %o3 /* Pass 0 in arity */
mov 0, %o2 /* Pass NULL in regs */
mov %o0, %o1
call erts_gc_after_bif_call
mov P, %o0 /* delay slot */
mov TEMP_RA, RA
ld [P+P_NRA], TEMP_RA
jmp RA+8
st %g0, [P+P_NARITY] /* delay slot */
/*
* We end up here when a BIF called from native signals an
* exceptional condition.
* HP has not been read from P.
* NSP has not been saved in P.
* TEMP_LR contains a copy of LR
*/
.global nbif_0_simple_exception
nbif_0_simple_exception:
ba .nbif_simple_exception
mov 0, %o1 /* delay slot */
.global nbif_1_simple_exception
nbif_1_simple_exception:
ba .nbif_simple_exception
mov 1, %o1 /* delay slot */
.global nbif_2_simple_exception
nbif_2_simple_exception:
ba .nbif_simple_exception
mov 2, %o1 /* delay slot */
.global nbif_3_simple_exception
nbif_3_simple_exception:
mov 3, %o1
/*FALLTHROUGH*/
.nbif_simple_exception:
ld [P+P_FREASON], %o0
cmp %o0, FREASON_TRAP
beq .handle_trap
nop
/*
* Find and invoke catch handler (it must exist).
* HP has not been read from P.
* NSP has not been saved in P.
* TEMP_RA should contain the current call's return address.
* %o1 should contain the current call's arity.
*/
st NSP, [P+P_NSP]
st TEMP_RA, [P+P_NRA]
st %o1, [P+P_NARITY]
/* find and prepare to invoke the handler */
call hipe_handle_exception /* Note: hipe_handle_exception() conses */
mov P, %o0 /* delay slot */
/* prepare to invoke the handler */
ld [P+P_NCALLEE], %o0 /* set by hipe_find_handler() */
RESTORE_CACHED_STATE
/* now invoke the handler */
jmp %o0
nop
/*
* A BIF failed with freason TRAP:
* - the BIF's arity is in %o1
* - the native RA was saved in TEMP_RA before the BIF call
* - HP has not been read from P
* - NSP has not been saved in P
*/
.handle_trap:
mov HIPE_MODE_SWITCH_RES_TRAP, %o0
.bif_exit:
/* restore C return address (hoisted to avoid stall) */
ld [%sp+96], %i7
st NSP, [P+P_NSP]
st %o1, [P+P_NARITY]
st TEMP_RA, [P+P_NRA]
jmp %i7+8
restore %g0, %o0, %o0
/*
* nbif_stack_trap_ra: trap return address for maintaining
* the gray/white stack boundary
*/
.global nbif_stack_trap_ra
nbif_stack_trap_ra: /* a return address, not a function */
nop /* ditto */
nop /* ditto */
/* This only handles a single return value.
If we have more, we need to save them in the PCB. */
mov %o0, TEMP_ARG0 /* save retval */
st NSP, [P+P_NSP]
call hipe_handle_stack_trap /* must not cons */
mov P, %o0 /* delay slot */
mov %o0, RA /* original RA */
jmp RA+8 /* resume at original RA */
mov TEMP_ARG0, %o0 /* delay slot: restore retval */
/*
* hipe_sparc_inc_stack
* Caller saved its RA in TEMP_RA (== TEMP1) before calling us.
*/
.global hipe_sparc_inc_stack
hipe_sparc_inc_stack:
STORE_ARG_REGS
mov RA, TEMP_ARG0
st NSP, [P+P_NSP]
/* hipe_inc_nstack reads and writes NSP and NSP_LIMIT,
but does not access LR/RA, HP, or FCALLS. */
call hipe_inc_nstack
mov P, %o0 /* delay slot */
LOAD_ARG_REGS
/* this relies on LOAD_ARG_REGS not clobbering TEMP_ARG0 */
jmp TEMP_ARG0+8
ld [P+P_NSP], NSP /* delay slot */
#if defined(__linux__) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits
#endif
