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-rw-r--r--sysdeps/unix/sysv/linux/x86_64/Makefile2
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/clone.S4
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/sigaction.c104
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym3
4 files changed, 16 insertions, 97 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/Makefile b/sysdeps/unix/sysv/linux/x86_64/Makefile
index bdad5063df..0f20367236 100644
--- a/sysdeps/unix/sysv/linux/x86_64/Makefile
+++ b/sysdeps/unix/sysv/linux/x86_64/Makefile
@@ -10,6 +10,6 @@ ifeq ($(subdir),stdlib)
sysdep_routines += __start_context
endif
-ifeq ($(subdir),csu)
+ifeq ($(subdir),stdlib)
gen-as-const-headers += ucontext_i.sym
endif
diff --git a/sysdeps/unix/sysv/linux/x86_64/clone.S b/sysdeps/unix/sysv/linux/x86_64/clone.S
index db42f209c9..8a12b09035 100644
--- a/sysdeps/unix/sysv/linux/x86_64/clone.S
+++ b/sysdeps/unix/sysv/linux/x86_64/clone.S
@@ -89,9 +89,6 @@ L(pseudo_end):
ret
L(thread_start):
- cfi_startproc;
- /* Clearing frame pointer is insufficient, use CFI. */
- cfi_undefined (rip);
/* Clear the frame pointer. The ABI suggests this be done, to mark
the outermost frame obviously. */
xorl %ebp, %ebp
@@ -116,7 +113,6 @@ L(thread_start):
/* Call exit with return value from function call. */
movq %rax, %rdi
call HIDDEN_JUMPTARGET (_exit)
- cfi_endproc;
cfi_startproc;
PSEUDO_END (BP_SYM (__clone))
diff --git a/sysdeps/unix/sysv/linux/x86_64/sigaction.c b/sysdeps/unix/sysv/linux/x86_64/sigaction.c
index ab10123858..d6f4558cef 100644
--- a/sysdeps/unix/sysv/linux/x86_64/sigaction.c
+++ b/sysdeps/unix/sysv/linux/x86_64/sigaction.c
@@ -1,5 +1,5 @@
/* POSIX.1 `sigaction' call for Linux/x86-64.
- Copyright (C) 2001, 2002, 2003, 2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2005 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
@@ -33,14 +33,17 @@
translate it here. */
#include <kernel_sigaction.h>
-#include "ucontext_i.h"
-
/* We do not globally define the SA_RESTORER flag so do it here. */
#define SA_RESTORER 0x04000000
/* Using the hidden attribute here does not change the code but it
helps to avoid warnings. */
+#if defined HAVE_HIDDEN && defined HAVE_VISIBILITY_ATTRIBUTE \
+ && !defined HAVE_BROKEN_VISIBILITY_ATTRIBUTE
extern void restore_rt (void) asm ("__restore_rt") attribute_hidden;
+#else
+static void restore_rt (void) asm ("__restore_rt");
+#endif
/* If ACT is not NULL, change the action for SIG to *ACT.
@@ -92,95 +95,18 @@ weak_alias (__libc_sigaction, sigaction)
signal handlers work right. Important are both the names
(__restore_rt) and the exact instruction sequence.
If you ever feel the need to make any changes, please notify the
- appropriate GDB maintainer.
-
- The unwind information starts a byte before __restore_rt, so that
- it is found when unwinding, to get an address the unwinder assumes
- will be in the middle of a call instruction. See the Linux kernel
- (the i386 vsyscall, in particular) for an explanation of the complex
- unwind information used here in order to get the traditional CFA.
- We do not restore cs - it's only stored as two bytes here so that's
- a bit tricky. We don't use the gas cfi directives, so that we can
- reliably add .cfi_signal_frame. */
-
-#define do_cfa_expr \
- " .byte 0x0f\n" /* DW_CFA_def_cfa_expression */ \
- " .uleb128 2f-1f\n" /* length */ \
- "1: .byte 0x77\n" /* DW_OP_breg7 */ \
- " .sleb128 " CFI_STRINGIFY (oRSP) "\n" \
- " .byte 0x06\n" /* DW_OP_deref */ \
- "2:"
-
-#define do_expr(regno, offset) \
- " .byte 0x10\n" /* DW_CFA_expression */ \
- " .uleb128 " CFI_STRINGIFY (regno) "\n" \
- " .uleb128 2f-1f\n" /* length */ \
- "1: .byte 0x77\n" /* DW_OP_breg7 */ \
- " .sleb128 " CFI_STRINGIFY (offset) "\n" \
- "2:"
+ appropriate GDB maintainer. */
#define RESTORE(name, syscall) RESTORE2 (name, syscall)
# define RESTORE2(name, syscall) \
-asm \
- ( \
- /* `nop' for debuggers assuming `call' should not disalign the code. */ \
- " nop\n" \
- ".align 16\n" \
- ".LSTART_" #name ":\n" \
- " .type __" #name ",@function\n" \
- "__" #name ":\n" \
- " movq $" #syscall ", %rax\n" \
- " syscall\n" \
- ".LEND_" #name ":\n" \
- ".section .eh_frame,\"a\",@progbits\n" \
- ".LSTARTFRAME_" #name ":\n" \
- " .long .LENDCIE_" #name "-.LSTARTCIE_" #name "\n" \
- ".LSTARTCIE_" #name ":\n" \
- " .long 0\n" /* CIE ID */ \
- " .byte 1\n" /* Version number */ \
- " .string \"zRS\"\n" /* NUL-terminated augmentation string */ \
- " .uleb128 1\n" /* Code alignment factor */ \
- " .sleb128 -8\n" /* Data alignment factor */ \
- " .uleb128 16\n" /* Return address register column (rip) */ \
- /* Augmentation value length */ \
- " .uleb128 .LENDAUGMNT_" #name "-.LSTARTAUGMNT_" #name "\n" \
- ".LSTARTAUGMNT_" #name ":\n" \
- " .byte 0x1b\n" /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ \
- ".LENDAUGMNT_" #name ":\n" \
- " .align 8\n" \
- ".LENDCIE_" #name ":\n" \
- " .long .LENDFDE_" #name "-.LSTARTFDE_" #name "\n" /* FDE len */ \
- ".LSTARTFDE_" #name ":\n" \
- " .long .LSTARTFDE_" #name "-.LSTARTFRAME_" #name "\n" /* CIE */ \
- /* `LSTART_' is subtracted 1 as debuggers assume a `call' here. */ \
- " .long (.LSTART_" #name "-1)-.\n" /* PC-relative start addr. */ \
- " .long .LEND_" #name "-(.LSTART_" #name "-1)\n" \
- " .uleb128 0\n" /* FDE augmentation length */ \
- do_cfa_expr \
- do_expr (8 /* r8 */, oR8) \
- do_expr (9 /* r9 */, oR9) \
- do_expr (10 /* r10 */, oR10) \
- do_expr (11 /* r11 */, oR11) \
- do_expr (12 /* r12 */, oR12) \
- do_expr (13 /* r13 */, oR13) \
- do_expr (14 /* r14 */, oR14) \
- do_expr (15 /* r15 */, oR15) \
- do_expr (5 /* rdi */, oRDI) \
- do_expr (4 /* rsi */, oRSI) \
- do_expr (6 /* rbp */, oRBP) \
- do_expr (3 /* rbx */, oRBX) \
- do_expr (1 /* rdx */, oRDX) \
- do_expr (0 /* rax */, oRAX) \
- do_expr (2 /* rcx */, oRCX) \
- do_expr (7 /* rsp */, oRSP) \
- do_expr (16 /* rip */, oRIP) \
- /* libgcc-4.1.1 has only `DWARF_FRAME_REGISTERS == 17'. */ \
- /* do_expr (49 |* rflags *|, oEFL) */ \
- /* `cs'/`ds'/`fs' are unaligned and a different size. */ \
- /* gas: Error: register save offset not a multiple of 8 */ \
- " .align 8\n" \
- ".LENDFDE_" #name ":\n" \
- " .previous\n" \
+asm \
+ ( \
+ ".align 16\n" \
+ CFI_STARTPROC "\n" \
+ "__" #name ":\n" \
+ " movq $" #syscall ", %rax\n" \
+ " syscall\n" \
+ CFI_ENDPROC "\n" \
);
/* The return code for realtime-signals. */
RESTORE (restore_rt, __NR_rt_sigreturn)
diff --git a/sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym b/sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym
index af3e0e544b..b3cfe9aa4c 100644
--- a/sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym
+++ b/sysdeps/unix/sysv/linux/x86_64/ucontext_i.sym
@@ -18,8 +18,6 @@ oRSP mreg (RSP)
oRBX mreg (RBX)
oR8 mreg (R8)
oR9 mreg (R9)
-oR10 mreg (R10)
-oR11 mreg (R11)
oR12 mreg (R12)
oR13 mreg (R13)
oR14 mreg (R14)
@@ -30,7 +28,6 @@ oRDX mreg (RDX)
oRAX mreg (RAX)
oRCX mreg (RCX)
oRIP mreg (RIP)
-oEFL mreg (EFL)
oFPREGS mcontext (fpregs)
oSIGMASK ucontext (uc_sigmask)
oFPREGSMEM ucontext (__fpregs_mem)
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-03 03:13:10 +0000