diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/makecontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/alpha/makecontext.S | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/makecontext.S b/sysdeps/unix/sysv/linux/alpha/makecontext.S new file mode 100644 index 0000000000..223117e26d --- /dev/null +++ b/sysdeps/unix/sysv/linux/alpha/makecontext.S @@ -0,0 +1,164 @@ +/* Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <ucontext-offsets.h> + + +ENTRY(__makecontext) + ldgp $29, 0($27) +#ifdef PROF + .set noat + lda AT, _mcount + jsr AT, (AT), _mcount + .set at +#endif + .prologue 1 + + /* Compute top of stack, including arguments. */ + ldq $1, UC_STACK+SS_SP($16) + ldq $2, UC_STACK+SS_SIZE($16) + addq $1, $2, $8 + subq $18, 6, $1 + cmovlt $1, 0, $1 + s8addq $1, 0, $2 + subq $8, $2, $8 + + /* Copy all parameters. Switch statement header here. */ + ldah $3, $jumptable($29) !gprelhigh + cmple $18, 6, $1 + mov $18, $2 + cmoveq $1, 7, $2 + s4addq $2, $3, $3 + ldl $4, $jumptable($3) !gprellow + addq $4, $29, $4 + jmp $31, ($4), $args1 + + .section .rodata + .align 2 +$jumptable: + .gprel32 $args0 + .gprel32 $args1 + .gprel32 $args2 + .gprel32 $args3 + .gprel32 $args4 + .gprel32 $args5 + .gprel32 $args6 + .gprel32 $argsN + .text + + /* Here we process arguments 7 through N. This is a straight + stack-to-stack copy. */ + .align 4 +$argsN: + subq $18, 6, $1 + lda $2, 0($8) + lda $3, 3*8($30) + .align 4 +1: + ldq $0, 0($3) + subq $1, 1, $1 + lda $3, 8($3) + stq $0, 0($2) + lda $2, 8($2) + bne $1, 1b + + /* Here we process arguments 6 through 0. This involves + copying into the register save areas of the ucontext. */ + .align 4 +$args6: + ldq $0, 2*8($30) + stq $0, UC_SIGCTX+SC_REGS+21*8($16) + unop + stq $0, UC_SIGCTX+SC_FPREGS+21*8($16) +$args5: + ldq $0, 1*8($30) + stq $0, UC_SIGCTX+SC_REGS+20*8($16) + unop + stq $0, UC_SIGCTX+SC_FPREGS+20*8($16) +$args4: + ldq $0, 0*8($30) + stq $0, UC_SIGCTX+SC_REGS+19*8($16) + unop + stq $0, UC_SIGCTX+SC_FPREGS+19*8($16) +$args3: + unop + stq $21, UC_SIGCTX+SC_REGS+18*8($16) + unop + stt $f21, UC_SIGCTX+SC_FPREGS+18*8($16) +$args2: + unop + stq $20, UC_SIGCTX+SC_REGS+17*8($16) + unop + stt $f20, UC_SIGCTX+SC_FPREGS+17*8($16) +$args1: + unop + stq $19, UC_SIGCTX+SC_REGS+16*8($16) + unop + stt $f19, UC_SIGCTX+SC_FPREGS+16*8($16) +$args0: + + /* Set up the registers ready to invoke __startcontext. + We seed $27 with the target function address, and $9 + with the link from ucp. */ + ldah $0, __startcontext($29) !gprelhigh + ldq $1, UC_LINK($16) + lda $0, __startcontext($0) !gprellow + stq $17, UC_SIGCTX+SC_REGS+27*8($16) + stq $8, UC_SIGCTX+SC_REGS+30*8($16) + stq $0, UC_SIGCTX+SC_PC($16) + stq $1, UC_SIGCTX+SC_REGS+9*8($16) + + /* No return value from makecontext. */ + ret + +END(__makecontext) +weak_alias (__makecontext, makecontext) + +/* This function is where a new makecontext "thread" begins life. + We have already set up $27 for calling the target function, and + we've set $9 to the UC_LINK of the parent context. + + If the function returns, we either jump to the linked context + (if non-null) or exit. */ + + .align 4 + .ent __startcontext +__startcontext: + .frame $31, 0, $31, 0 + .prologue 0 + + jsr $26, ($27), 0 + ldgp $29, 0($26) + mov $9, $16 + beq $9, 1f + +#ifdef PIC + bsr $26, __setcontext !samegp +1: mov $31, $16 + bsr $26, HIDDEN_JUMPTARGET(exit) !samegp +#else + jsr $26, __setcontext + ldgp $29, 0($26) +1: mov $31, $16 + jsr $26, HIDDEN_JUMPTARGET(exit) +#endif + + halt + + .end __startcontext |