zyppe/anolis-glibc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

update to glibc-2.28-151.el8.src.rpm

Browse source 
Signed-off-by: Liwei Ge <geliwei@openanolis.org>
This commit is contained in:
Liwei Ge 2021-06-16 16:09:23 +08:00
parent ba6a26df65
commit 37da1d0798
284 changed files with 62546 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

120
glibc-rh1855790-1.patch Normal file
View file

@ -0,0 +1,120 @@
commit 15eab1e3e89129ab3ed03f5bdc3415b26e9caeb9
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Sat Feb 1 05:44:55 2020 -0800
i386: Don't unnecessarily save and restore EAX, ECX and EDX [BZ# 25262]
On i386, since EAX, ECX and EDX are caller-saved, there are no need
to save and restore EAX, ECX and EDX in getcontext, setcontext and
swapcontext. They just need to clear EAX on success. The extra
scratch registers are needed to enable CET.
Tested on i386.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
---
diff --git a/sysdeps/unix/sysv/linux/i386/getcontext.S b/sysdeps/unix/sysv/linux/i386/getcontext.S
index 26ca08a..6637596 100644
--- a/sysdeps/unix/sysv/linux/i386/getcontext.S
+++ b/sysdeps/unix/sysv/linux/i386/getcontext.S
@@ -26,13 +26,7 @@ ENTRY(__getcontext)
/* Load address of the context data structure. */
movl 4(%esp), %eax
- /* Return value of getcontext. EAX is the only register whose
- value is not preserved. */
- movl $0, oEAX(%eax)
-
- /* Save the 32-bit register values and the return address. */
- movl %ecx, oECX(%eax)
- movl %edx, oEDX(%eax)
+ /* Save the preserved register values and the return address. */
movl %edi, oEDI(%eax)
movl %esi, oESI(%eax)
movl %ebp, oEBP(%eax)
diff --git a/sysdeps/unix/sysv/linux/i386/setcontext.S b/sysdeps/unix/sysv/linux/i386/setcontext.S
index a604fca..7565d7d 100644
--- a/sysdeps/unix/sysv/linux/i386/setcontext.S
+++ b/sysdeps/unix/sysv/linux/i386/setcontext.S
@@ -65,22 +65,19 @@ ENTRY(__setcontext)
cfi_offset (esi, oESI)
cfi_offset (ebp, oEBP)
cfi_offset (ebx, oEBX)
- cfi_offset (edx, oEDX)
- cfi_offset (ecx, oECX)
movl oESP(%eax), %esp
/* Push the return address on the new stack so we can return there. */
pushl %ecx
- /* Load the values of all the 32-bit registers (except ESP).
- Since we are loading from EAX, it must be last. */
+ /* Load the values of all the preserved registers (except ESP). */
movl oEDI(%eax), %edi
movl oESI(%eax), %esi
movl oEBP(%eax), %ebp
movl oEBX(%eax), %ebx
- movl oEDX(%eax), %edx
- movl oECX(%eax), %ecx
- movl oEAX(%eax), %eax
+
+ /* All done, return 0 for success. */
+ xorl %eax, %eax
/* End FDE here, we fall into another context. */
cfi_endproc
diff --git a/sysdeps/unix/sysv/linux/i386/swapcontext.S b/sysdeps/unix/sysv/linux/i386/swapcontext.S
index 431f22c..ce27d51 100644
--- a/sysdeps/unix/sysv/linux/i386/swapcontext.S
+++ b/sysdeps/unix/sysv/linux/i386/swapcontext.S
@@ -26,13 +26,7 @@ ENTRY(__swapcontext)
/* Load address of the context data structure we save in. */
movl 4(%esp), %eax
- /* Return value of swapcontext. EAX is the only register whose
- value is not preserved. */
- movl $0, oEAX(%eax)
-
- /* Save the 32-bit register values and the return address. */
- movl %ecx, oECX(%eax)
- movl %edx, oEDX(%eax)
+ /* Save the preserved register values and the return address. */
movl %edi, oEDI(%eax)
movl %esi, oESI(%eax)
movl %ebp, oEBP(%eax)
@@ -91,15 +85,14 @@ ENTRY(__swapcontext)
/* Push the return address on the new stack so we can return there. */
pushl %ecx
- /* Load the values of all the 32-bit registers (except ESP).
- Since we are loading from EAX, it must be last. */
+ /* Load the values of all the preserved registers (except ESP). */
movl oEDI(%eax), %edi
movl oESI(%eax), %esi
movl oEBP(%eax), %ebp
movl oEBX(%eax), %ebx
- movl oEDX(%eax), %edx
- movl oECX(%eax), %ecx
- movl oEAX(%eax), %eax
+
+ /* All done, return 0 for success. */
+ xorl %eax, %eax
/* The following 'ret' will pop the address of the code and jump
to it. */
diff --git a/sysdeps/unix/sysv/linux/i386/ucontext_i.sym b/sysdeps/unix/sysv/linux/i386/ucontext_i.sym
index b11a550..1dfe03d 100644
--- a/sysdeps/unix/sysv/linux/i386/ucontext_i.sym
+++ b/sysdeps/unix/sysv/linux/i386/ucontext_i.sym
@@ -21,9 +21,6 @@ oESI mreg (ESI)
oEBP mreg (EBP)
oESP mreg (ESP)
oEBX mreg (EBX)
-oEDX mreg (EDX)
-oECX mreg (ECX)
-oEAX mreg (EAX)
oEIP mreg (EIP)
oFPREGS mcontext (fpregs)
oSIGMASK ucontext (uc_sigmask)