derek.holloway
7502bf64a4
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83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/* Copyright 2018-2024 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* The idea here is to, via use of the dwarf assembler, create a function
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which occupies two non-contiguous address ranges.
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foo_cold and foo will be combined into a single function foo with a
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function bar in between these two ranges.
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This test case was motivated by a bug in which a function which
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occupied two non-contiguous address ranges was calling another
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function which resides in between these ranges. So we end up with
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a situation in which the low/start address of our constructed foo
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(in this case) will be less than any of the addresses in bar, but
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the high/end address of foo will be greater than any of bar's
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addresses.
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This situation was causing a problem in the caching code of
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find_pc_partial_function: When the low and high addresses of foo
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are placed in the cache, the simple check that was used to see if
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the cache was applicable would (incorrectly) succeed when presented
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with an address in bar. I.e. an address in bar presented as an
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input to find_pc_partial_function could produce the answer "this
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address belongs to foo". */
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volatile int e = 0;
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void bar (void);
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void foo_cold (void);
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void baz (void);
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void
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baz (void)
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{
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asm ("baz_label: .globl baz_label");
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} /* baz end */
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void
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foo_cold (void)
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{ /* foo_cold prologue */
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asm ("foo_cold_label: .globl foo_cold_label");
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baz (); /* foo_cold baz call */
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asm ("foo_cold_label2: .globl foo_cold_label2");
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} /* foo_cold end */
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void
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bar (void)
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{
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asm ("bar_label: .globl bar_label");
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} /* bar end */
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void
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foo (void)
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{ /* foo prologue */
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asm ("foo_label: .globl foo_label");
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bar (); /* foo bar call */
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asm ("foo_label2: .globl foo_label2");
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if (e) foo_cold (); /* foo foo_cold call */
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asm ("foo_label3: .globl foo_label3");
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} /* foo end */
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int
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main (void)
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{ /* main prologue */
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asm ("main_label: .globl main_label");
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foo (); /* main foo call */
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asm ("main_label2: .globl main_label2");
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return 0; /* main return */
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} /* main end */
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