119 lines
4.8 KiB
Diff
119 lines
4.8 KiB
Diff
commit ecab2afea46099b4e7dfd551462689224afdbe3a
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Author: Stan Cox <scox@redhat.com>
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Date: Wed Dec 1 16:19:22 2021 -0500
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Handle user supplied sdt probe argument template
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User supplied templates were erroneously removed by commit eaa15b047,
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which complicated the template expansion. To do the above the
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expansion of STAP_PROBE_ASM(provider, fooprobe,
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STAP_PROBE_ASM_TEMPLATE(3)) adds an unused argument:
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STAP_PROBE_ASM(provider, fooprobe, /*template expansion*/ "%[SDT..]..",
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"use _SDT_ASM_TEMPLATE") A supplied template
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STAP_PROBE_ASM(provider, fooprobe, "4@%rdx 8@%rax") is left alone. If
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the varargs has 2 args (the fake "use ..") then macro expansion
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inserts the expanded string, otherwise "4@.." becomes an ascii op.
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diff --git a/includes/sys/sdt.h b/includes/sys/sdt.h
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index 28d236d91..24d5e01c3 100644
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--- a/includes/sys/sdt.h
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+++ b/includes/sys/sdt.h
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@@ -290,7 +290,7 @@ __extension__ extern unsigned long long __sdt_unsp;
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_SDT_ASM_1(.purgem _SDT_TYPE_) \
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_SDT_ASM_1(.purgem _SDT_TYPE)
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-#define _SDT_ASM_BODY(provider, name, pack_args, args) \
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+#define _SDT_ASM_BODY(provider, name, pack_args, args, ...) \
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_SDT_DEF_MACROS \
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_SDT_ASM_1(990: _SDT_NOP) \
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_SDT_ASM_3( .pushsection .note.stapsdt,_SDT_ASM_AUTOGROUP,"note") \
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@@ -417,9 +417,9 @@ __extension__ extern unsigned long long __sdt_unsp;
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counted, so we don't have to worry about the behavior of macros
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called without any arguments. */
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-#ifdef SDT_USE_VARIADIC
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#define _SDT_NARG(...) __SDT_NARG(__VA_ARGS__, 12,11,10,9,8,7,6,5,4,3,2,1,0)
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#define __SDT_NARG(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12, N, ...) N
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+#ifdef SDT_USE_VARIADIC
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#define _SDT_PROBE_N(provider, name, N, ...) \
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_SDT_PROBE(provider, name, N, (__VA_ARGS__))
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#define STAP_PROBEV(provider, name, ...) \
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@@ -468,9 +468,15 @@ __extension__ extern unsigned long long __sdt_unsp;
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Note that these can use operand templates like %0 or %[name],
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and likewise they must write %%reg for a literal operand of %reg. */
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+#define _SDT_ASM_BODY_1(p,n,...) _SDT_ASM_BODY(p,n,_SDT_ASM_SUBSTR,(__VA_ARGS__))
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+#define _SDT_ASM_BODY_2(p,n,...) _SDT_ASM_BODY(p,n,/*_SDT_ASM_STRING */,__VA_ARGS__)
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+#define _SDT_ASM_BODY_N2(p,n,no,...) _SDT_ASM_BODY_ ## no(p,n,__VA_ARGS__)
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+#define _SDT_ASM_BODY_N1(p,n,no,...) _SDT_ASM_BODY_N2(p,n,no,__VA_ARGS__)
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+#define _SDT_ASM_BODY_N(p,n,...) _SDT_ASM_BODY_N1(p,n,_SDT_NARG(0, __VA_ARGS__),__VA_ARGS__)
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+
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#if __STDC_VERSION__ >= 199901L
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# define STAP_PROBE_ASM(provider, name, ...) \
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- _SDT_ASM_BODY(provider, name, /*_SDT_ASM_STRING */, __VA_ARGS__) \
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+ _SDT_ASM_BODY_N(provider, name, __VA_ARGS__) \
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_SDT_ASM_BASE
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# define STAP_PROBE_ASM_OPERANDS(n, ...) _SDT_ASM_OPERANDS_##n(__VA_ARGS__)
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#else
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@@ -478,7 +484,7 @@ __extension__ extern unsigned long long __sdt_unsp;
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_SDT_ASM_BODY(provider, name, /* _SDT_ASM_STRING */, (args)) \
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_SDT_ASM_BASE
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#endif
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-#define STAP_PROBE_ASM_TEMPLATE(n) _SDT_ASM_TEMPLATE_##n
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+#define STAP_PROBE_ASM_TEMPLATE(n) _SDT_ASM_TEMPLATE_##n,"use _SDT_ASM_TEMPLATE_"
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/* DTrace compatible macro names. */
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diff --git a/testsuite/systemtap.base/sdt_casm.c b/testsuite/systemtap.base/sdt_casm.c
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index 1cff23c5f..9b357086c 100644
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--- a/testsuite/systemtap.base/sdt_casm.c
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+++ b/testsuite/systemtap.base/sdt_casm.c
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@@ -3,6 +3,7 @@
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int main()
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{
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int x = 42;
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+ int y = 43;
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__asm__ __volatile__ (
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STAP_PROBE_ASM(testsuite, probe0, STAP_PROBE_ASM_TEMPLATE(0))
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);
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@@ -10,5 +11,9 @@ int main()
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STAP_PROBE_ASM(testsuite, probe1, STAP_PROBE_ASM_TEMPLATE(1))
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:: STAP_PROBE_ASM_OPERANDS(1, x)
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);
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+ // Create a template to test explicit template support
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+ __asm__ __volatile__ (
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+ STAP_PROBE_ASM(testsuite, probe2, -4@%[ARG1] -4@%[ARG2])
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+ :: [ARG1] "rm" (x), [ARG2] "rm" (y));
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return 0;
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}
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diff --git a/testsuite/systemtap.base/sdt_casm.exp b/testsuite/systemtap.base/sdt_casm.exp
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index 5791cb2b9..0cd1cb517 100644
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--- a/testsuite/systemtap.base/sdt_casm.exp
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+++ b/testsuite/systemtap.base/sdt_casm.exp
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@@ -18,7 +18,8 @@ proc cleanup_handler { verbose } {
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set script $srcdir/$subdir/$test.stp
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set ::result_string {PASS: probe0
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-PASS: probe1}
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+PASS: probe1
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+PASS: probe2}
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set asm_flags [sdt_includes]
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set asm_flags "$asm_flags additional_flags=-std=c99"
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diff --git a/testsuite/systemtap.base/sdt_casm.stp b/testsuite/systemtap.base/sdt_casm.stp
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index 4f2539c93..530a79175 100644
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--- a/testsuite/systemtap.base/sdt_casm.stp
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+++ b/testsuite/systemtap.base/sdt_casm.stp
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@@ -10,3 +10,11 @@ probe process.mark("probe1")
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else
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printf("FAIL: %s (%d != 42)\n", $$name, $arg1)
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}
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+
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+probe process.mark("probe2")
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+{
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+ if ($arg1 == 42 && $arg2 == 43)
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+ printf("PASS: %s\n", $$name)
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+ else
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+ printf("FAIL: %s (%d/%d != 42/43)\n", $$name, $arg1, $arg2)
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+}
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