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- Implement context routines for ARM (#817276)

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This commit is contained in:
Jeff Law 2012-04-30 14:04:07 -06:00
parent 64e6774cce
commit a540ed36fe
2 changed files with 421 additions and 1 deletions
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411
glibc-rh817276.patch Normal file
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@ -0,0 +1,411 @@
diff -Nrup j1/sysdeps/unix/sysv/linux/arm/Makefile j2/sysdeps/unix/sysv/linux/arm/Makefile
--- j1/sysdeps/unix/sysv/linux/arm/Makefile 2012-01-08 22:47:04.000000000 -0700
+++ j2/sysdeps/unix/sysv/linux/arm/Makefile 2012-04-30 14:02:33.999589709 -0600
@@ -20,3 +20,7 @@ endif
ifeq ($(subdir),resource)
sysdep_routines += oldgetrlimit64
endif
+
+ifeq ($(subdir),stdlib)
+gen-as-const-headers += ucontext_i.sym
+endif
diff -Nrup j1/sysdeps/unix/sysv/linux/arm/eabi/getcontext.S j2/sysdeps/unix/sysv/linux/arm/eabi/getcontext.S
--- j1/sysdeps/unix/sysv/linux/arm/eabi/getcontext.S 1969-12-31 17:00:00.000000000 -0700
+++ j2/sysdeps/unix/sysv/linux/arm/eabi/getcontext.S 2012-04-30 14:02:34.000589703 -0600
@@ -0,0 +1,113 @@
+/* Copyright (C) 2012 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <rtld-global-offsets.h>
+
+#include "ucontext_i.h"
+
+ .syntax unified
+ .text
+
+/* int getcontext (ucontext_t *ucp) */
+
+ENTRY(__getcontext)
+ /* No need to save r0-r3, d0-d7, or d16-d31. */
+ add r1, r0, #MCONTEXT_ARM_R4
+ stmia r1, {r4-r11}
+
+ /* Save R13 separately as Thumb can't STM it. */
+ str r13, [r0, #MCONTEXT_ARM_SP]
+ str r14, [r0, #MCONTEXT_ARM_LR]
+ /* Return to LR */
+ str r14, [r0, #MCONTEXT_ARM_PC]
+ /* Return zero */
+ mov r2, #0
+ str r2, [r0, #MCONTEXT_ARM_R0]
+
+ /* Save ucontext_t * across the next call. */
+ mov r4, r0
+
+ /* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
+ mov r0, #SIG_BLOCK
+ mov r1, #0
+ add r2, r4, #UCONTEXT_SIGMASK
+ bl PLTJMP(__sigprocmask)
+
+ /* Store FP regs. Much of the FP code is copied from arm/eabi/setjmp.S. */
+
+#ifdef PIC
+ ldr r2, 1f
+ ldr r1, Lrtld_global_ro
+0: add r2, pc, r2
+ ldr r2, [r2, r1]
+ ldr r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
+#else
+ ldr r2, Lhwcap
+ ldr r2, [r2, #0]
+#endif
+
+ add r0, r4, #UCONTEXT_REGSPACE
+
+ tst r2, #HWCAP_ARM_VFP
+ beq Lno_vfp
+
+ /* Store the VFP registers.
+ Don't use VFP instructions directly because this code
+ is used in non-VFP multilibs. */
+ /* Following instruction is vstmia r0!, {d8-d15}. */
+ stc p11, cr8, [r0], #64
+ /* Store the floating-point status register. */
+ /* Following instruction is vmrs r1, fpscr. */
+ mrc p10, 7, r1, cr1, cr0, 0
+ str r1, [r0], #4
+Lno_vfp:
+
+ tst r2, #HWCAP_ARM_IWMMXT
+ beq Lno_iwmmxt
+
+ /* Save the call-preserved iWMMXt registers. */
+ /* Following instructions are wstrd wr10, [r0], #8 (etc.) */
+ stcl p1, cr10, [r0], #8
+ stcl p1, cr11, [r0], #8
+ stcl p1, cr12, [r0], #8
+ stcl p1, cr13, [r0], #8
+ stcl p1, cr14, [r0], #8
+ stcl p1, cr15, [r0], #8
+Lno_iwmmxt:
+
+ /* Restore the clobbered R4 and LR. */
+ ldr r14, [r4, #MCONTEXT_ARM_LR]
+ ldr r4, [r4, #MCONTEXT_ARM_R4]
+
+ mov r0, #0
+
+ DO_RET(r14)
+
+END(__getcontext)
+
+#ifdef PIC
+1: .long _GLOBAL_OFFSET_TABLE_ - 0b - 8
+Lrtld_global_ro:
+ .long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
+#else
+Lhwcap:
+ .long C_SYMBOL_NAME(_dl_hwcap)
+#endif
+
+
+weak_alias(__getcontext, getcontext)
diff -Nrup j1/sysdeps/unix/sysv/linux/arm/eabi/makecontext.c j2/sysdeps/unix/sysv/linux/arm/eabi/makecontext.c
--- j1/sysdeps/unix/sysv/linux/arm/eabi/makecontext.c 1969-12-31 17:00:00.000000000 -0700
+++ j2/sysdeps/unix/sysv/linux/arm/eabi/makecontext.c 2012-04-30 14:02:34.001589697 -0600
@@ -0,0 +1,73 @@
+/* Copyright (C) 2012 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdarg.h>
+#include <ucontext.h>
+
+/* Number of arguments that go in registers. */
+#define NREG_ARGS 4
+
+/* Take a context previously prepared via getcontext() and set to
+ call func() with the given int only args. */
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
+{
+ extern void __startcontext (void);
+ unsigned long *funcstack;
+ va_list vl;
+ unsigned long *regptr;
+ unsigned int reg;
+ int misaligned;
+
+ /* Start at the top of stack. */
+ funcstack = (unsigned long *) (ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+
+ /* Ensure the stack stays eight byte aligned. */
+ misaligned = ((unsigned long) funcstack & 4) != 0;
+
+ if ((argc > NREG_ARGS) && (argc & 1) != 0)
+ misaligned = !misaligned;
+
+ if (misaligned)
+ funcstack -= 1;
+
+ va_start (vl, argc);
+
+ /* Reserve space for the on-stack arguments. */
+ if (argc > NREG_ARGS)
+ funcstack -= (argc - NREG_ARGS);
+
+ ucp->uc_mcontext.arm_sp = (unsigned long) funcstack;
+ ucp->uc_mcontext.arm_pc = (unsigned long) func;
+
+ /* Exit to startcontext() with the next context in R4 */
+ ucp->uc_mcontext.arm_r4 = (unsigned long) ucp->uc_link;
+ ucp->uc_mcontext.arm_lr = (unsigned long) __startcontext;
+
+ /* The first four arguments go into registers. */
+ regptr = &(ucp->uc_mcontext.arm_r0);
+
+ for (reg = 0; (reg < argc) && (reg < NREG_ARGS); reg++)
+ *regptr++ = va_arg (vl, unsigned long);
+
+ /* And the remainder on the stack. */
+ for (; reg < argc; reg++)
+ *funcstack++ = va_arg (vl, unsigned long);
+
+ va_end (vl);
+}
+weak_alias (__makecontext, makecontext)
diff -Nrup j1/sysdeps/unix/sysv/linux/arm/eabi/setcontext.S j2/sysdeps/unix/sysv/linux/arm/eabi/setcontext.S
--- j1/sysdeps/unix/sysv/linux/arm/eabi/setcontext.S 1969-12-31 17:00:00.000000000 -0700
+++ j2/sysdeps/unix/sysv/linux/arm/eabi/setcontext.S 2012-04-30 14:02:34.049589449 -0600
@@ -0,0 +1,101 @@
+/* Copyright (C) 2012 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <rtld-global-offsets.h>
+
+#include "ucontext_i.h"
+
+ .syntax unified
+ .text
+
+/* int setcontext (const ucontext_t *ucp) */
+
+ENTRY(__setcontext)
+ mov r4, r0
+ add r0, r0, #UCONTEXT_REGSPACE
+
+ /* Restore the VFP registers. Copied from arm/eabi/__longjmp.S. */
+#ifdef PIC
+ ldr r2, 1f
+ ldr r1, Lrtld_global_ro
+0: add r2, pc, r2
+ ldr r2, [r2, r1]
+ ldr r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
+#else
+ ldr r2, Lhwcap
+ ldr r2, [r2, #0]
+#endif
+
+ tst r2, #HWCAP_ARM_VFP
+ beq Lno_vfp_sc
+
+ /* Following instruction is vldmia r0!, {d8-d15}. */
+ ldc p11, cr8, [r0], #64
+ /* Restore the floating-point status register. */
+ ldr r1, [r0], #4
+ /* Following instruction is fmxr fpscr, r1. */
+ mcr p10, 7, r1, cr1, cr0, 0
+Lno_vfp_sc:
+ tst r2, #HWCAP_ARM_IWMMXT
+ beq Lno_iwmmxt_sc
+
+ /* Restore the call-preserved iWMMXt registers. */
+ /* Following instructions are wldrd wr10, [r0], #8 (etc.) */
+ ldcl p1, cr10, [r0], #8
+ ldcl p1, cr11, [r0], #8
+ ldcl p1, cr12, [r0], #8
+ ldcl p1, cr13, [r0], #8
+ ldcl p1, cr14, [r0], #8
+ ldcl p1, cr15, [r0], #8
+Lno_iwmmxt_sc:
+
+ /* Now bring back the signal status. */
+ mov r0, #SIG_SETMASK
+ add r1, r4, #UCONTEXT_SIGMASK
+ mov r2, #0
+ bl PLTJMP(__sigprocmask)
+
+ /* Loading r0-r3 makes makecontext easier. */
+ add r14, r4, #MCONTEXT_ARM_R0
+ ldmia r14, {r0-r12}
+ ldr r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
+ add r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
+ ldmia r14, {r14, pc}
+
+END(setcontext)
+weak_alias(__setcontext, setcontext)
+
+ /* Called when a makecontext() context returns. Start the
+ context in R4 or fall through to exit(). */
+ENTRY(__startcontext)
+ movs r0, r4
+ bne PLTJMP(__setcontext)
+
+ @ New context was 0 - exit
+ b PLTJMP(_exit)
+END(__startcontext)
+
+#ifdef PIC
+1: .long _GLOBAL_OFFSET_TABLE_ - 0b - 8
+Lrtld_global_ro:
+ .long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
+#else
+Lhwcap:
+ .long C_SYMBOL_NAME(_dl_hwcap)
+#endif
+
diff -Nrup j1/sysdeps/unix/sysv/linux/arm/eabi/swapcontext.S j2/sysdeps/unix/sysv/linux/arm/eabi/swapcontext.S
--- j1/sysdeps/unix/sysv/linux/arm/eabi/swapcontext.S 1969-12-31 17:00:00.000000000 -0700
+++ j2/sysdeps/unix/sysv/linux/arm/eabi/swapcontext.S 2012-04-30 14:02:34.050589444 -0600
@@ -0,0 +1,63 @@
+/* Copyright (C) 2012 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+ .syntax unified
+ .text
+
+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
+
+ENTRY(swapcontext)
+
+ /* Have getcontext() do most of the work then fix up
+ LR afterwards. Save R3 to keep the stack aligned. */
+ push {r0,r1,r3,r14}
+ cfi_adjust_cfa_offset (16)
+ cfi_rel_offset (r0,0)
+ cfi_rel_offset (r1,4)
+ cfi_rel_offset (r3,8)
+ cfi_rel_offset (r14,12)
+
+ bl __getcontext
+ mov r4, r0
+
+ pop {r0,r1,r3,r14}
+ cfi_adjust_cfa_offset (-16)
+ cfi_restore (r0)
+ cfi_restore (r1)
+ cfi_restore (r3)
+ cfi_restore (r14)
+
+ /* Exit if getcontext() failed. */
+ cmp r4, #0
+ itt ne
+ movne r0, r4
+ RETINSTR(ne, r14)
+
+ /* Fix up LR and the PC. */
+ str r13,[r0, #MCONTEXT_ARM_SP]
+ str r14,[r0, #MCONTEXT_ARM_LR]
+ str r14,[r0, #MCONTEXT_ARM_PC]
+
+ /* And swap using swapcontext(). */
+ mov r0, r1
+ b __setcontext
+
+END(swapcontext)
diff -Nrup j1/sysdeps/unix/sysv/linux/arm/ucontext_i.sym j2/sysdeps/unix/sysv/linux/arm/ucontext_i.sym
--- j1/sysdeps/unix/sysv/linux/arm/ucontext_i.sym 1969-12-31 17:00:00.000000000 -0700
+++ j2/sysdeps/unix/sysv/linux/arm/ucontext_i.sym 2012-04-30 14:02:34.051589439 -0600
@@ -0,0 +1,30 @@
+#include <inttypes.h>
+#include <signal.h>
+#include <stddef.h>
+#include <sys/ucontext.h>
+
+SIG_BLOCK
+SIG_SETMASK
+
+-- Offsets of the fields in the ucontext_t structure.
+#define ucontext(member) offsetof (ucontext_t, member)
+#define mcontext(member) ucontext (uc_mcontext.member)
+
+UCONTEXT_FLAGS ucontext (uc_flags)
+UCONTEXT_LINK ucontext (uc_link)
+UCONTEXT_STACK ucontext (uc_stack)
+UCONTEXT_MCONTEXT ucontext (uc_mcontext)
+UCONTEXT_SIGMASK ucontext (uc_sigmask)
+
+UCONTEXT_REGSPACE ucontext (uc_regspace)
+
+MCONTEXT_TRAP_NO mcontext (trap_no)
+MCONTEXT_ERROR_CODE mcontext (error_code)
+MCONTEXT_OLDMASK mcontext (oldmask)
+MCONTEXT_ARM_R0 mcontext (arm_r0)
+MCONTEXT_ARM_R4 mcontext (arm_r4)
+MCONTEXT_ARM_SP mcontext (arm_sp)
+MCONTEXT_ARM_LR mcontext (arm_lr)
+MCONTEXT_ARM_PC mcontext (arm_pc)
+MCONTEXT_ARM_CPSR mcontext (arm_cpsr)
+MCONTEXT_FAULT_ADDRESS mcontext (fault_address)

11
glibc.spec
View File

@ -28,7 +28,7 @@
Summary: The GNU libc libraries
Name: glibc
Version: %{glibcversion}
Release: 34%{?dist}
Release: 35%{?dist}
# GPLv2+ is used in a bunch of programs, LGPLv2+ is used for libraries.
# Things that are linked directly into dynamically linked programs
# and shared libraries (e.g. crt files, lib*_nonshared.a) have an additional
@ -112,6 +112,7 @@ Patch1042: %{name}-rh801650-1.patch
Patch1043: %{name}-rh801650-2.patch
Patch1046: %{name}-rh806403.patch
Patch1048: %{name}-rh804792.patch
Patch1049: %{name}-rh817276.patch
#
# Patches submitted, but not yet approved upstream.
@ -455,6 +456,11 @@ rm -rf %{glibcportsdir}
%patch2051 -p1
%patch2052 -p1
pushd ../%{glibcportsdir}
%patch1049 -p1
popd
# A lot of programs still misuse memcpy when they have to use
# memmove. The memcpy implementation below is not tolerant at
# all.
@ -1306,6 +1312,9 @@ rm -f *.filelist*
%endif
%changelog
* Mon Apr 30 2012 Jeff Law <law@redhat.com> - 2.15-35
- Implement context routines for ARM (#817276)
* Fri Apr 13 2012 Jeff Law <law@redhat.com> - 2.15-34
- Issue a warning if FORTIFY_CHECKING is requested, but disabled.