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This will let us specify something like 'sys_xyz/foo' instead of 'sys_xyz' in the syscall table, where the 'foo' qualifier conveys some extra information to the C code. The intent is to allow things like sys_execve/ptregs to indicate that sys_execve() touches pt_regs. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/2de06e33dce62556b3ec662006fcb295504e296e.1454022279.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
66 lines
1.5 KiB
Bash
66 lines
1.5 KiB
Bash
#!/bin/sh
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in="$1"
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out="$2"
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syscall_macro() {
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abi="$1"
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nr="$2"
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entry="$3"
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# Entry can be either just a function name or "function/qualifier"
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real_entry="${entry%%/*}"
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qualifier="${entry:${#real_entry}}" # Strip the function name
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qualifier="${qualifier:1}" # Strip the slash, if any
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echo "__SYSCALL_${abi}($nr, $real_entry, $qualifier)"
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}
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emit() {
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abi="$1"
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nr="$2"
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entry="$3"
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compat="$4"
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if [ "$abi" == "64" -a -n "$compat" ]; then
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echo "a compat entry for a 64-bit syscall makes no sense" >&2
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exit 1
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fi
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if [ -z "$compat" ]; then
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if [ -n "$entry" ]; then
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syscall_macro "$abi" "$nr" "$entry"
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fi
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else
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echo "#ifdef CONFIG_X86_32"
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if [ -n "$entry" ]; then
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syscall_macro "$abi" "$nr" "$entry"
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fi
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echo "#else"
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syscall_macro "$abi" "$nr" "$compat"
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echo "#endif"
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fi
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}
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grep '^[0-9]' "$in" | sort -n | (
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while read nr abi name entry compat; do
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abi=`echo "$abi" | tr '[a-z]' '[A-Z]'`
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if [ "$abi" == "COMMON" -o "$abi" == "64" ]; then
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# COMMON is the same as 64, except that we don't expect X32
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# programs to use it. Our expectation has nothing to do with
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# any generated code, so treat them the same.
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emit 64 "$nr" "$entry" "$compat"
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elif [ "$abi" == "X32" ]; then
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# X32 is equivalent to 64 on an X32-compatible kernel.
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echo "#ifdef CONFIG_X86_X32_ABI"
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emit 64 "$nr" "$entry" "$compat"
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echo "#endif"
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elif [ "$abi" == "I386" ]; then
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emit "$abi" "$nr" "$entry" "$compat"
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else
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echo "Unknown abi $abi" >&2
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exit 1
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fi
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done
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) > "$out"
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