diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/Makefile | 4 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/__start_context.S | 48 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/getcontext.S | 10 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/setcontext.S | 12 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/swapcontext.S | 20 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/ucontext_i.h | 6 |
6 files changed, 97 insertions, 3 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/Makefile b/sysdeps/unix/sysv/linux/x86_64/Makefile index e1b4a9561a..09745d82d4 100644 --- a/sysdeps/unix/sysv/linux/x86_64/Makefile +++ b/sysdeps/unix/sysv/linux/x86_64/Makefile @@ -44,3 +44,7 @@ $(objpfx)syscall-%.h $(objpfx)syscall-%.d: ../sysdeps/unix/sysv/linux/sys/syscal mv -f $(@:.h=.d)-t2 $(@:.h=.d) endif + +ifeq ($(subdir),stdlib) +sysdep_routines += __start_context +endif diff --git a/sysdeps/unix/sysv/linux/x86_64/__start_context.S b/sysdeps/unix/sysv/linux/x86_64/__start_context.S new file mode 100644 index 0000000000..ad4502ca0a --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/__start_context.S @@ -0,0 +1,48 @@ +/* Copyright (C) 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Jaeger <aj@suse.de>, 2002. + + 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> + +/* This is the helper code which gets called if a function which is + registered with 'makecontext' returns. In this case we have to + install the context listed in the uc_link element of the context + 'makecontext' manipulated at the time of the 'makecontext' call. + If the pointer is NULL the process must terminate. */ + + +ENTRY(__start_context) + /* This removes the parameters passed to the function given to + 'makecontext' from the stack. RBX contains the address + on the stack pointer for the next context. */ + movq %rbx, %rsp + + popq %rdi /* This is the next context. */ + testq %rdi, %rdi + je 2f /* If it is zero exit. */ + + call JUMPTARGET(__setcontext) + /* If this returns (which can happen if the syscall fails) we'll + exit the program with the return error value (-1). */ + +2: movq %rax,%rdi + call JUMPTARGET(exit) + /* The 'exit' call should never return. In case it does cause + the process to terminate. */ + hlt +END(__start_context) diff --git a/sysdeps/unix/sysv/linux/x86_64/getcontext.S b/sysdeps/unix/sysv/linux/x86_64/getcontext.S index e941f5d5fd..2f2c710040 100644 --- a/sysdeps/unix/sysv/linux/x86_64/getcontext.S +++ b/sysdeps/unix/sysv/linux/x86_64/getcontext.S @@ -33,7 +33,8 @@ ENTRY(__getcontext) - /* Save the preserved registers and the return address. */ + /* Save the preserved registers, the registers used for passing + args, and the return address. */ movq %rbx, oRBX(%rdi) movq %rbp, oRBP(%rdi) movq %r12, oR12(%rdi) @@ -41,6 +42,13 @@ ENTRY(__getcontext) movq %r14, oR14(%rdi) movq %r15, oR15(%rdi) + movq %rdi, oRDI(%rdi) + movq %rsi, oRSI(%rdi) + movq %rdx, oRDX(%rdi) + movq %rcx, oRCX(%rdi) + movq %r8, oR8(%rdi) + movq %r9, oR9(%rdi) + movq (%rsp), %rcx movq %rcx, oRIP(%rdi) leaq 8(%rsp), %rcx /* Exclude the return address. */ diff --git a/sysdeps/unix/sysv/linux/x86_64/setcontext.S b/sysdeps/unix/sysv/linux/x86_64/setcontext.S index eb46034a50..e3d770bcc6 100644 --- a/sysdeps/unix/sysv/linux/x86_64/setcontext.S +++ b/sysdeps/unix/sysv/linux/x86_64/setcontext.S @@ -55,7 +55,8 @@ ENTRY(__setcontext) ldmxcsr oMXCSR(%rdi) - /* Load the new stack pointer and the preserved registers. */ + /* Load the new stack pointer, the preserved registers and + registers used for passing args. */ movq oRSP(%rdi), %rsp movq oRBX(%rdi), %rbx movq oRBP(%rdi), %rbp @@ -69,6 +70,15 @@ ENTRY(__setcontext) movq oRIP(%rdi), %rcx pushq %rcx + movq oRSI(%rdi), %rsi + movq oRDX(%rdi), %rdx + movq oRCX(%rdi), %rcx + movq oR8(%rdi), %r8 + movq oR9(%rdi), %r9 + + /* Setup finally %rdi. */ + movq oRDI(%rdi), %rdi + /* Clear rax to indicate success. */ xorq %rax, %rax diff --git a/sysdeps/unix/sysv/linux/x86_64/swapcontext.S b/sysdeps/unix/sysv/linux/x86_64/swapcontext.S index 3dddb3cec2..4394e2ae9f 100644 --- a/sysdeps/unix/sysv/linux/x86_64/swapcontext.S +++ b/sysdeps/unix/sysv/linux/x86_64/swapcontext.S @@ -35,7 +35,8 @@ other than the PRESERVED state. */ ENTRY(__swapcontext) - /* Save the preserved registers and the return address. */ + /* Save the preserved registers, the registers used for passing args, + and the return address. */ movq %rbx, oRBX(%rdi) movq %rbp, oRBP(%rdi) movq %r12, oR12(%rdi) @@ -43,6 +44,13 @@ ENTRY(__swapcontext) movq %r14, oR14(%rdi) movq %r15, oR15(%rdi) + movq %rdi, oRDI(%rdi) + movq %rsi, oRSI(%rdi) + movq %rdx, oRDX(%rdi) + movq %rcx, oRCX(%rdi) + movq %r8, oR8(%rdi) + movq %r9, oR9(%rdi) + movq (%rsp), %rcx movq %rcx, oRIP(%rdi) leaq 8(%rsp), %rcx /* Exclude the return address. */ @@ -95,6 +103,16 @@ ENTRY(__swapcontext) movq oRIP(%rsi), %rcx pushq %rcx + /* Setup registers used for passing args. */ + movq oRDI(%rsi), %rdi + movq oRDX(%rsi), %rdx + movq oRCX(%rsi), %rcx + movq oR8(%rsi), %r8 + movq oR9(%rsi), %r9 + + /* Setup finally %rsi. */ + movq oRSI(%rsi), %rsi + /* Clear rax to indicate success. */ xorq %rax, %rax diff --git a/sysdeps/unix/sysv/linux/x86_64/ucontext_i.h b/sysdeps/unix/sysv/linux/x86_64/ucontext_i.h index 0a2283b82c..5451a308ee 100644 --- a/sysdeps/unix/sysv/linux/x86_64/ucontext_i.h +++ b/sysdeps/unix/sysv/linux/x86_64/ucontext_i.h @@ -29,11 +29,17 @@ #define oRBP 120 #define oRSP 160 #define oRBX 128 +#define oR8 40 +#define oR9 48 #define oR12 72 #define oR13 80 #define oR14 88 #define oR15 96 +#define oRDI 104 +#define oRSI 112 +#define oRDX 136 #define oRAX 144 +#define oRCX 152 #define oRIP 168 #define oFPREGS 208 #define oSIGMASK 280 |