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a3ae315a8f
Similar to powerpc, mips also issues rt_sigreturn for setcontext case the v0 value saved is not the one set by setcontext or makecontext. As for powerpc, it is intention is no really supported since setcontext is not async-signal-safe. Checked the context tests on mips64-linux-gnu and mips-linux-gnu. * sysdeps/unix/sysv/linux/mips/getcontext.S (__getcontext): Remove the magic flag store. * sysdeps/unix/sysv/linux/mips/makecontext.S (__makecontext): Likewise. * sysdeps/unix/sysv/linux/mips/swapcontext.S (__swapcontext): Likewise. * sysdeps/unix/sysv/linux/mips/setcontext.S (__setcontext): Remove rt_sigreturn call.
205 lines
4.4 KiB
ArmAsm
205 lines
4.4 KiB
ArmAsm
/* Modify saved context.
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Copyright (C) 2009-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <sys/asm.h>
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#include <sys/fpregdef.h>
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#include <sys/regdef.h>
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#include "ucontext_i.h"
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/* int makecontext (ucontext_t *ucp, (void *func) (), int argc, ...) */
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.text
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.set nomips16
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LOCALSZ = 0
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ARGSZ = 0
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MASK = 0x00000000
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#ifdef __PIC__
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LOCALSZ = 1 /* save gp */
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#endif
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#if _MIPS_SIM != _ABIO32
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ARGSZ = 5 /* save a3-a7 */
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# ifdef __PIC__
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MASK = 0x10000000
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# endif
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#endif
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FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
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GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
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#if _MIPS_SIM != _ABIO32
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A3OFF = FRAMESZ - (5 * SZREG) /* callee-allocated */
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A4OFF = FRAMESZ - (4 * SZREG)
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A5OFF = FRAMESZ - (3 * SZREG)
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A6OFF = FRAMESZ - (2 * SZREG)
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A7OFF = FRAMESZ - (1 * SZREG)
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NARGREGS = 8
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#else
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A3OFF = FRAMESZ + (3 * SZREG) /* caller-allocated */
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NARGREGS = 4
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#endif
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MCONTEXT_GREGSZ = 8
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#if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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MCONTEXT_GREGOFF = 4
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#else
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MCONTEXT_GREGOFF = 0
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#endif
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NESTED (__makecontext, FRAMESZ, ra)
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.mask MASK, -(ARGSZ * SZREG)
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.fmask 0x00000000, 0
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98:
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#ifdef __PIC__
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SETUP_GP
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#endif
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PTR_ADDIU sp, -FRAMESZ
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cfi_adjust_cfa_offset (FRAMESZ)
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#ifdef __PIC__
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SETUP_GP64_STACK (GPOFF, __makecontext)
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SAVE_GP (GPOFF)
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#endif
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#ifdef PROF
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.set noat
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move AT, ra
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jal _mcount
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.set at
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#endif
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/* Store args to be passed. */
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REG_S a3, A3OFF(sp)
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#if _MIPS_SIM != _ABIO32
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REG_S a4, A4OFF(sp)
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REG_S a5, A5OFF(sp)
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REG_S a6, A6OFF(sp)
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REG_S a7, A7OFF(sp)
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#endif
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/* Set up the stack. */
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PTR_L t0, STACK_SP(a0)
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PTR_L t2, STACK_SIZE(a0)
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PTR_ADDIU t1, sp, A3OFF
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PTR_ADDU t0, t2
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and t0, ALMASK
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blez a2, 2f /* no arguments */
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/* Store register arguments. */
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PTR_ADDIU t2, a0, MCONTEXT_GREGS + 4 * MCONTEXT_GREGSZ + MCONTEXT_GREGOFF
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move t3, zero
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0:
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addiu t3, 1
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REG_L v1, (t1)
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PTR_ADDIU t1, SZREG
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REG_S v1, (t2)
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PTR_ADDIU t2, MCONTEXT_GREGSZ
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bgeu t3, a2, 2f /* all done */
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bltu t3, NARGREGS, 0b /* next */
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/* Make room for stack arguments. */
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PTR_SUBU t2, a2, t3
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PTR_SLL t2, 3
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PTR_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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1:
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addiu t3, 1
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REG_L v1, (t1)
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PTR_ADDIU t1, SZREG
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REG_S v1, (t2)
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PTR_ADDIU t2, SZREG
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bltu t3, a2, 1b /* next */
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2:
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#if _MIPS_SIM == _ABIO32
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/* Make room for a0-a3 storage. */
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PTR_ADDIU t0, -(NARGSAVE * SZREG)
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#endif
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PTR_L v1, UCONTEXT_LINK(a0)
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#ifdef __PIC__
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PTR_ADDIU t9, 99f - 98b
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#else
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PTR_LA t9, 99f
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#endif
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/* sp */
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REG_S t0, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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/* s0 */
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REG_S v1, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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#ifdef __PIC__
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/* s1 */
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REG_S gp, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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#endif
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/* ra */
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REG_S t9, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
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REG_S a1, (MCONTEXT_GREGOFF + MCONTEXT_PC)(a0)
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#ifdef __PIC__
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RESTORE_GP64_STACK
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PTR_ADDIU sp, FRAMESZ
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cfi_adjust_cfa_offset (-FRAMESZ)
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#endif
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jr ra
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/* We need to terminate the FDE to stop unwinding if backtrace was
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called within a context created by makecontext. */
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cfi_endproc
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nop
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99:
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#ifdef __PIC__
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move gp, s1
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#endif
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move a0, zero
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beqz s0, 0f
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/* setcontext (ucp) */
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move a0, s0
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#ifdef __PIC__
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PTR_LA t9, JUMPTARGET (__setcontext)
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jalr t9
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# if _MIPS_SIM == _ABIO32
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move gp, s1
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# endif
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#else
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jal JUMPTARGET (__setcontext)
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#endif
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move a0, v0
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0:
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/* exit (a0) */
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#ifdef __PIC__
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PTR_LA t9, HIDDEN_JUMPTARGET (exit)
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jalr t9
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#else
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jal HIDDEN_JUMPTARGET (exit)
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#endif
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/* You don't exist, you won't feel anything. */
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1:
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lb zero, (zero)
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b 1b
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cfi_startproc
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PSEUDO_END (__makecontext)
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weak_alias (__makecontext, makecontext)
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