mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
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3e7774ea5a
FreeBSD (and Darwin) use the carry flag for syscall syscall status. That means that in the assembler for do_syscall_for_client_WRK they have a call to LibVEX_GuestAMD64_put_rflag_c (amd64) or LibVEX_GuestX86_put_eflag_c (x86). These also call WRK functions. The problem is that do_syscall_for_client_WRK has carefully crafted labels correspinding to IP addresses. If a signal interrupts processdings, IP can be compared to these addresses so that VG_(fixup_guest_state_after_syscall_interrupted) can work out how to resume the syscall. But if IP is in the save carry flag functions, the address is not recognized and VG_(fixup_guest_state_after_syscall_interrupted) fails. The crash in the title happens because the interrupted syscall does not reset its status, and on the next syscall it is expected that the status be idle. To fix this I added global variables that get set to 1 just before calling the save carry flag functions, and cleared just after. VG_(fixup_guest_state_after_syscall_interrupted) can then check this and work out which section we are in and resume the syscall correctly. Also: Start a new NEWS section for 3.20 Add a regtest for this and also a similar one for Bug 445032 (x86-freebsd only, new subdir). I saw that this problem also probably exists with macOS, so I made the same changes there (not yet tested)
43 lines
986 B
Makefile
43 lines
986 B
Makefile
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include $(top_srcdir)/Makefile.tool-tests.am
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dist_noinst_SCRIPTS = filter_stderr test.sh filter_452275
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EXTRA_DIST = \
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auxv.vgtest \
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auxv.stderr.exp \
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auxv.stderr.exp-32on64 \
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auxv.stderr.exp-freebsd13 \
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osrel.vgtest \
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osrel.stderr.exp \
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osrel.stdout.exp \
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swapcontext.vgtest \
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swapcontext.stderr.exp \
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swapcontext.stdout.exp \
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fexecve_hw1.vgtest \
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fexecve_hw1.stdout.exp \
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fexecve_hw1.stderr.exp \
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fexecve_hw2.vgtest \
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fexecve_hw2.stdout.exp \
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fexecve_hw2.stderr.exp \
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fexecve_script1.vgtest \
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fexecve_script1.stderr.exp \
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fexecve_script2.vgtest \
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fexecve_script2.stdout.exp \
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fexecve_script2.stderr.exp \
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fexecve_txt.vgtest \
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fexecve_txt.stderr.exp \
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452275.vgtest \
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452275.stderr.out
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check_PROGRAMS = \
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auxv osrel swapcontext hello_world fexecve 452275
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AM_CFLAGS += $(AM_FLAG_M3264_PRI)
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AM_CXXFLAGS += $(AM_FLAG_M3264_PRI)
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auxv_CFLAGS = ${AM_CFLAGS}
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osrel_CFLAGS = ${AM_CFLAGS}
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swapcontext_CFLAGS = ${AM_CFLAGS}
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hello_world_SOURCES = hello_world.cpp
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