/* Set up a context to call a function.
- Copyright (C) 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002-2020 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
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. */
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <shlib-compat.h>
ENTRY(__makecontext)
/* Set up the first 7 args to the function in its registers */
- addi r11,r3,_UC_REG_SPACE
- stw r11,_UC_REGS_PTR(r3)
+ lwz r11,_UC_REGS_PTR(r3)
stw r6,_UC_GREGS+(PT_R3*4)(r11)
stw r7,_UC_GREGS+(PT_R4*4)(r11)
stw r8,_UC_GREGS+(PT_R5*4)(r11)
/* Set the function's LR to point to the exitcode below. */
#ifdef PIC
mflr r0
- bl 1f
+ cfi_register(lr,r0)
+ /* Use this conditional form of branch and link to avoid destroying
+ the cpu link stack used to predict blr return addresses. */
+ bcl 20,31,1f
1: mflr r6
addi r6,r6,L(exitcode)-1b
mtlr r0
+ cfi_same_value (lr)
#else
lis r6,L(exitcode)@ha
addi r6,r6,L(exitcode)@l
blr
+ cfi_endproc
+ nop
/*
* If the function returns, it comes here. We put ucp->uc_link in
* r31, which is a callee-saved register. We have to continue with
L(exitcode):
mr. r3,r31
beq 4f
- bl JUMPTARGET(__setcontext)
+ bl __setcontext@local
4: bl HIDDEN_JUMPTARGET(exit)
b 4b
+ cfi_startproc
END(__makecontext)
-versioned_symbol (libc, __makecontext, makecontext, GLIBC_2_3_3)
+versioned_symbol (libc, __makecontext, makecontext, GLIBC_2_3_4)
+
+#if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
+
+ compat_text_section
+ENTRY(__novec_makecontext)
+ /* Set up the first 7 args to the function in its registers */
+ addi r11,r3,_UC_REG_SPACE
+ stw r11,_UC_REGS_PTR(r3)
+ stw r6,_UC_GREGS+(PT_R3*4)(r11)
+ stw r7,_UC_GREGS+(PT_R4*4)(r11)
+ stw r8,_UC_GREGS+(PT_R5*4)(r11)
+ stw r9,_UC_GREGS+(PT_R6*4)(r11)
+ stw r10,_UC_GREGS+(PT_R7*4)(r11)
+ lwz r8,8(r1)
+ lwz r9,12(r1)
+ stw r8,_UC_GREGS+(PT_R8*4)(r11)
+ stw r9,_UC_GREGS+(PT_R9*4)(r11)
+
+ /* Set the NIP to the start of the function */
+ stw r4,_UC_GREGS+(PT_NIP*4)(r11)
+
+ /* Set the function's r31 to ucp->uc_link for the exitcode below. */
+ lwz r7,_UC_LINK(r3)
+ stw r7,_UC_GREGS+(PT_R31*4)(r11)
+
+ /* Set the function's LR to point to the exitcode below. */
+#ifdef PIC
+ mflr r0
+ cfi_register(lr,r0)
+ /* Use this conditional form of branch and link to avoid destroying
+ the cpu link stack used to predict blr return addresses. */
+ bcl 20,31,1f
+1: mflr r6
+ addi r6,r6,L(novec_exitcode)-1b
+ mtlr r0
+ cfi_same_value (lr)
+#else
+ lis r6,L(novec_exitcode)@ha
+ addi r6,r6,L(novec_exitcode)@l
+#endif
+ stw r6,_UC_GREGS+(PT_LNK*4)(r11)
+
+ /*
+ * Set up the stack frame for the function.
+ * If we have more than 5 args to the function (8 args to makecontext),
+ * there will be some arguments on the stack which have to end up
+ * in registers. If there are more than 8 args to the function,
+ * we have to copy (argc - 8) args from our stack to the functions'
+ * stack (and allow space for them in the frame).
+ */
+ lwz r4,_UC_STACK_SP(r3)
+ lwz r8,_UC_STACK_SIZE(r3)
+ add r4,r4,r8
+ rlwinm r4,r4,0,0,27 /* round down to 16-byte boundary */
+ addi r7,r4,-16 /* stack frame for fn's caller */
+ cmpwi r5,8
+ blt 2f /* less than 8 args is easy */
+ lwz r10,16(r1)
+ stw r10,_UC_GREGS+(PT_R10*4)(r11)
+ beq 2f /* if exactly 8 args */
+ subi r9,r5,3
+ subi r5,r5,8
+ rlwinm r9,r9,2,0,27
+ subf r7,r9,r4
+ mtctr r5 /* copy the 9th and following args */
+ addi r6,r1,16
+ addi r8,r7,4
+3: lwzu r10,4(r6)
+ stwu r10,4(r8)
+ bdnz 3b
+2: stw r7,_UC_GREGS+(PT_R1*4)(r11)
+ li r6,0
+ stw r6,0(r7)
+
+ blr
+
+ cfi_endproc
+ nop
+/*
+ * If the function returns, it comes here. We put ucp->uc_link in
+ * r31, which is a callee-saved register. We have to continue with
+ * the context that r31 points to, or exit if it is 0.
+ */
+L(novec_exitcode):
+ mr. r3,r31
+ beq 4f
+ bl __novec_setcontext@local
+4: bl HIDDEN_JUMPTARGET(exit)
+ b 4b
+
+ cfi_startproc
+END(__novec_makecontext)
+ .previous
+
+compat_symbol (libc, __novec_makecontext, makecontext, GLIBC_2_3_3)
+#endif
#if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_3_3)
#define _ERRNO_H 1
#include <bits/errno.h>
+ compat_text_section
ENTRY (__makecontext_stub)
li r3,ENOSYS
- b JUMPTARGET(__syscall_error)
- END (__makecontext_stub)
+ b __syscall_error@local
+END (__makecontext_stub)
+ .previous
compat_symbol (libc, __makecontext_stub, makecontext, GLIBC_2_1)
projects / thirdparty / glibc.git / blobdiff