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libgcc-5.4.0 stack checking

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git-svn-id: svn://kolibrios.org@6519 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Sergey Semyonov (Serge) 2016-09-09 14:48:39 +00:00
parent 3c24fb5fae
commit 18d5943171
2 changed files with 76 additions and 9 deletions
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25
contrib/toolchain/gcc/5x/libgcc/Makefile
View File

@ -72,34 +72,33 @@ EH_MODEL = dw2
CUSTOM_CRTSTUFF = yes CUSTOM_CRTSTUFF = yes
crtbegin.o: $(srcdir)/config/i386/cygming-crtbegin.c #crtbegin.o: config/i386/cygming-crtbegin.c
$(crt_compile) -fno-omit-frame-pointer -c $< # $(crt_compile) -fno-omit-frame-pointer -c $<
crtbeginS.o: $(srcdir)/config/i386/cygming-crtbegin.c #crtbeginS.o: config/i386/cygming-crtbegin.c
$(crt_compile) -fno-omit-frame-pointer -c $< -DCRTSTUFFS_O # $(crt_compile) -fno-omit-frame-pointer -c $< -DCRTSTUFFS_O
# We intentionally use a implementation-reserved init priority of 0, # We intentionally use a implementation-reserved init priority of 0,
# so allow the warning. # so allow the warning.
crtend.o: $(srcdir)/config/i386/cygming-crtend.c #crtend.o: config/i386/cygming-crtend.c
$(crt_compile) -fno-omit-frame-pointer -Wno-error -c $< # $(crt_compile) -fno-omit-frame-pointer -Wno-error -c $<
# This is an endfile, Use -minline-all-stringops to ensure # This is an endfile, Use -minline-all-stringops to ensure
# that __builtin_memset doesn't refer to the lib function memset(). # that __builtin_memset doesn't refer to the lib function memset().
crtfastmath.o: $(srcdir)/config/i386/crtfastmath.c crtfastmath.o: config/i386/crtfastmath.c
$(gcc_compile) -mfxsr -msse -c $< $(gcc_compile) -mfxsr -msse -c $<
LIB1ASMSRC = i386/cygwin.S LIB1ASMSRC = i386/chkstk.S
LIB1ASMFUNCS = _chkstk _chkstk_ms LIB1ASMFUNCS = _chkstk _chkstk_ms
DFP_ENABLE = true DFP_ENABLE = true
@ -217,6 +216,14 @@ lib2funcs := $(filter-out $(LIB2FUNCS_EXCLUDE) $(LIB1ASMFUNCS),$(lib2funcs))
LIB2_DIVMOD_FUNCS := $(filter-out $(LIB2FUNCS_EXCLUDE) $(LIB1ASMFUNCS), \ LIB2_DIVMOD_FUNCS := $(filter-out $(LIB2FUNCS_EXCLUDE) $(LIB1ASMFUNCS), \
$(LIB2_DIVMOD_FUNCS)) $(LIB2_DIVMOD_FUNCS))
# Build "libgcc1" (assembly) components.
lib1asmfuncs-o = $(patsubst %,%$(objext),$(LIB1ASMFUNCS))
$(lib1asmfuncs-o): %$(objext): config/$(LIB1ASMSRC)
$(gcc_compile) -DL$* -xassembler-with-cpp -c $< -o $@
libgcc-objects += $(lib1asmfuncs-o)
# Build lib2funcs. For the static library also include LIB2FUNCS_ST. # Build lib2funcs. For the static library also include LIB2FUNCS_ST.
lib2funcs-o = $(patsubst %,%$(objext),$(lib2funcs) $(LIB2FUNCS_ST)) lib2funcs-o = $(patsubst %,%$(objext),$(lib2funcs) $(LIB2FUNCS_ST))

60
contrib/toolchain/gcc/5x/libgcc/config/i386/chkstk.S Normal file
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@ -0,0 +1,60 @@
.section .text
#ifdef L_chkstk
.global ___chkstk
.global __alloca
___chkstk:
__alloca:
pushl %ecx /* save temp */
leal 8(%esp), %ecx /* point past return addr */
subl %eax, %ecx
cmpl %fs:8, %ecx # check low stack limit
jb 1f
movl %esp, %eax /* save old stack pointer */
movl %ecx, %esp /* decrement stack */
movl (%eax), %ecx /* recover saved temp */
movl 4(%eax), %eax /* recover return address */
/* Push the return value back. Doing this instead of just
jumping to %eax preserves the cached call-return stack
used by most modern processors. */
pushl %eax
ret
1:
int3 #trap to debugger
.ascii "Stack overflow"
#endif
#ifdef L_chkstk_ms
.global ___chkstk_ms
___chkstk_ms:
pushl %ecx /* save temp */
pushl %eax
cmpl $0x1000, %eax /* > 4k ?*/
leal 12(%esp), %ecx /* point past return addr */
jb 2f
1:
subl $0x1000, %ecx /* yes, move pointer down 4k*/
cmpl %fs:8, %ecx /* check low stack limit */
jb 3f
orl $0x0, (%ecx) /* probe there */
subl $0x1000, %eax /* decrement count */
cmpl $0x1000, %eax
ja 1b /* and do it again */
2:
subl %eax, %ecx
orl $0x0, (%ecx) /* less than 4k, just peek here */
popl %eax
popl %ecx
ret
3:
int3 #trap to debugger
.ascii "Stack overflow"
#endif