forked from ariadne/libucontext
mips: add MIPS O32 ABI implementation (closes #2)
parent
01432abb3e
commit
add34ddac7
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@ -0,0 +1,94 @@
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#ifndef __ARCH_MIPS64_DEFS_H
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#define __ARCH_MIPS64_DEFS_H
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#define REG_SZ (4)
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#define REG_R0 (0)
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#define REG_R1 (1)
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#define REG_R2 (2)
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#define REG_R3 (3)
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#define REG_R4 (4)
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#define REG_R5 (5)
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#define REG_R6 (6)
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#define REG_R7 (7)
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#define REG_R8 (8)
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#define REG_R9 (9)
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#define REG_R10 (10)
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#define REG_R11 (11)
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#define REG_R12 (12)
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#define REG_R13 (13)
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#define REG_R14 (14)
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#define REG_R15 (15)
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#define REG_R16 (16)
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#define REG_R17 (17)
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#define REG_R18 (18)
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#define REG_R19 (19)
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#define REG_R20 (20)
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#define REG_R21 (21)
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#define REG_R22 (22)
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#define REG_R23 (23)
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#define REG_R24 (24)
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#define REG_R25 (25)
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#define REG_R26 (26)
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#define REG_R27 (27)
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#define REG_R28 (28)
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#define REG_R29 (29)
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#define REG_R30 (30)
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#define REG_R31 (31)
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/* $a0 is $4 */
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#define REG_A0 (4)
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/* stack pointer is actually $29 */
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#define REG_SP (29)
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/* frame pointer is actually $30 */
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#define REG_FP (30)
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/* $s0 ($16) is used as link register */
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#define REG_LNK (16)
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/* $t9 ($25) is used as entry */
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#define REG_ENTRY (25)
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/* offset to mc_gregs in ucontext_t */
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#define MCONTEXT_GREGS (40)
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/* offset to PC in ucontext_t */
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#define MCONTEXT_PC (32)
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/* offset to uc_link in ucontext_t */
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#define UCONTEXT_UC_LINK (4)
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/* offset to uc_stack.ss_sp in ucontext_t */
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#define UCONTEXT_STACK_PTR (8)
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/* offset to uc_stack.ss_size in ucontext_t */
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#define UCONTEXT_STACK_SIZE (12)
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/* setup frame, from MIPS N32/N64 calling convention manual */
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#define ALSZ 15
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#define ALMASK ~15
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#define FRAMESZ (((LOCALSZ * REG_SZ) + ALSZ) & ALMASK) // 16
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#define GPOFF (FRAMESZ - (LOCALSZ * REG_SZ)) // [16 - 16]
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#define SETUP_FRAME(__proc) \
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.frame $sp, FRAMESZ, $ra; \
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.mask 0x10000000, 0; \
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.fmask 0x00000000, 0; \
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.set noreorder; \
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.cpload $25; \
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.set reorder;
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#define PUSH_FRAME(__proc) \
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addiu $sp, -FRAMESZ; \
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.cprestore GPOFF;
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#define POP_FRAME(__proc) \
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addiu $sp, FRAMESZ
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#define ENT(__proc) .ent __proc, 0;
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#include <common-defs.h>
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#endif
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@ -0,0 +1,46 @@
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/*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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LOCALSZ = 1
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#include "defs.h"
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ALIAS(getcontext, __getcontext)
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FUNC(__getcontext)
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/* copy $gp, $sp, $fp to temporary registers so we don't clobber them */
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move $a2, $gp
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move $a3, $sp
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move $a1, $fp
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PUSH_FRAME(__getcontext)
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/* set registers */
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sw $s0, ((16 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $s1, ((17 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $s2, ((18 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $s3, ((19 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $s4, ((20 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $s5, ((21 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $s6, ((22 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $s7, ((23 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $a2, ((28 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $a3, ((29 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $a1, ((30 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $ra, ((31 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sw $ra, (MCONTEXT_PC)($a0)
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POP_FRAME(__getcontext)
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jr $ra
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END(__getcontext)
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@ -0,0 +1,100 @@
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/*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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LOCALSZ = 2
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#include "defs.h"
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A3_OFF = FRAMESZ + (3 * REG_SZ)
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/*
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* Because we have to fiddle with $gp, we have to implement this in
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* assembly rather than C. Annoying, that...
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*/
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ALIAS(makecontext, __makecontext)
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FUNC(__makecontext)
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PUSH_FRAME(__makecontext)
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/* store $a3 through $a7 to the stack frame. */
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sw $a3, A3_OFF($sp)
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/* set $zero in the mcontext to 1. */
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li $v0, 1
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sw $v0, ((0 * REG_SZ) + MCONTEXT_GREGS)($a0)
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/* ensure the stack is aligned on a quad-word boundary. */
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lw $t0, UCONTEXT_STACK_PTR($a0)
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lw $t2, UCONTEXT_STACK_SIZE($a0)
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addiu $t1, $sp, A3_OFF
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addu $t0, $t2
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and $t0, ALMASK
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blez $a2, no_more_arguments
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/* store register arguments. */
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addiu $t2, $a0, MCONTEXT_GREGS + (4 * REG_SZ)
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move $t3, $zero
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store_register_arg:
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addiu $t3, 1
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lw $v1, ($t1)
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addiu $t1, REG_SZ
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sw $v1, ($t2)
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addiu $t2, REG_SZ
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bgeu $t3, $a2, no_more_arguments
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bltu $t3, 4, store_register_arg
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/* make room for stack arguments. */
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subu $t2, $a2, $t3
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sll $t2, 3
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subu $t0, $t2
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and $t0, ALMASK
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/* store stack arguments. */
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move $t2, $t0
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store_stack_arg:
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addiu $t3, 1
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lw $v1, ($t1)
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addiu $t1, REG_SZ
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sw $v1, ($t2)
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addiu $t2, REG_SZ
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bltu $t3, $a2, store_stack_arg
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no_more_arguments:
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/* make room for $a0-$a3 storage */
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addiu $t0, -(4 * REG_SZ)
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/* trampoline setup. */
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la $t9, __start_context
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/* copy link pointer as $s0... */
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lw $v1, UCONTEXT_UC_LINK($a0)
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sw $v1, ((16 * REG_SZ) + MCONTEXT_GREGS)($a0)
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/* set our $sp */
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sw $t0, ((29 * REG_SZ) + MCONTEXT_GREGS)($a0)
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/* $gp is copied as $s1 */
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sw $gp, ((17 * REG_SZ) + MCONTEXT_GREGS)($a0)
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/* set our $ra */
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sw $t9, ((31 * REG_SZ) + MCONTEXT_GREGS)($a0)
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/* set our $pc */
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sw $a1, MCONTEXT_PC($a0)
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POP_FRAME(__makecontext)
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jr $ra
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END(__makecontext)
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@ -0,0 +1,50 @@
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/*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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LOCALSZ = 1
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#include "defs.h"
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ALIAS(setcontext, __setcontext)
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FUNC(__setcontext)
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PUSH_FRAME(__setcontext)
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/* move the context to $v0 */
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move $v0, $a0
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/* load the registers */
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lw $a0, ((4 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $a1, ((5 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $a2, ((6 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $a3, ((7 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $s0, ((16 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $s1, ((17 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $s2, ((18 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $s3, ((19 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $s4, ((20 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $s5, ((21 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $s6, ((22 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $s7, ((23 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $gp, ((28 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $sp, ((29 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $fp, ((30 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $ra, ((31 * REG_SZ) + MCONTEXT_GREGS)($v0)
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lw $t9, (MCONTEXT_PC)($v0)
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move $v0, $zero
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jr $t9
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POP_FRAME(__setcontext)
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END(__setcontext)
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@ -0,0 +1,34 @@
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/*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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LOCALSZ = 1
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#include "defs.h"
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FUNC(__start_context)
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move $gp, $s1
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/* we receive our initial ucontext in $s0, so if $s0 is nil, bail */
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beqz $s0, no_linked_context
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/* call setcontext */
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move $a0, $s0
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la $t9, __setcontext
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jr $t9
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no_linked_context:
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move $a0, $zero
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la $t9, exit
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jalr $t9
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nop
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END(__start_context)
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@ -0,0 +1,81 @@
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/*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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LOCALSZ = 2
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#include "defs.h"
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A1_OFFSET = FRAMESZ - (1 * REG_SZ)
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ALIAS(swapcontext, __swapcontext)
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FUNC(__swapcontext)
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/* copy $gp, $sp, $fp to temporary registers so we don't clobber them */
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move $a2, $gp
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move $a3, $sp
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PUSH_FRAME(__swapcontext)
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/* set registers */
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sd $s0, ((16 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $s1, ((17 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $s2, ((18 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $s3, ((19 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $s4, ((20 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $s5, ((21 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $s6, ((22 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $s7, ((23 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $a2, ((28 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $a3, ((29 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $fp, ((30 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $ra, ((31 * REG_SZ) + MCONTEXT_GREGS)($a0)
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sd $ra, (MCONTEXT_PC)($a0)
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/* copy new context address in $a1 to stack */
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sd $a1, A1_OFFSET($sp)
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/* load new context address into $v0 */
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ld $v0, A1_OFFSET($sp)
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/* load the registers */
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ld $a0, ((4 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $a1, ((5 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $a2, ((6 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $a3, ((7 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $s0, ((16 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $s1, ((17 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $s2, ((18 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $s3, ((19 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $s4, ((20 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $s5, ((21 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $s6, ((22 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $s7, ((23 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $gp, ((28 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $sp, ((29 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $fp, ((30 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $ra, ((31 * REG_SZ) + MCONTEXT_GREGS)($v0)
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ld $t9, (MCONTEXT_PC)($v0)
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move $v0, $zero
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jr $t9
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fail:
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la $t9, exit
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POP_FRAME(__swapcontext)
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move $v0, $zero
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jalr $t9
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END(__swapcontext)
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