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authorTom de Vries <tdevries@suse.de>2025-01-22 10:46:08 +0100
committerTom de Vries <tdevries@suse.de>2025-01-22 10:46:08 +0100
commit4cbf39144c78ec78a6924466993b6788ae8d1511 (patch)
treefe8c6ad51905a66333ffbe5e1d17a55338fdf237 /sim/bpf
parentc80eb5cbe7d32bcd9fbdb89f34b5882e64408173 (diff)
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[gdb/testsuite] Fix gdb.base/branch-to-self.exp on arm-linuxHEADmaster
On arm-linux (ubuntu 24.04 with gcc 13.3.0) with target board unix/-marm and test-case gdb.base/branch-to-self.exp I run into: ... (gdb) continue^M Continuing.^M ^M Breakpoint 2, main () at branch-to-self.c:38^M 38 for (;;); /* loop-line */^M (gdb) PASS: $exp: single-step: continue to breakpoint: hit breakpoint si^M 0x0040058c 38 for (;;); /* loop-line */^M (gdb) FAIL: $exp: single-step: si ... In contrast, on the same machine but with debian testing and gcc 14.2.0 we have: ... (gdb) continue^M Continuing.^M ^M Breakpoint 2, main () at branch-to-self.c:38^M 38 for (;;); /* loop-line */^M (gdb) PASS: $exp: single-step: continue to breakpoint: hit breakpoint si^M ^M Breakpoint 2, main () at branch-to-self.c:38^M 38 for (;;); /* loop-line */^M (gdb) PASS: $exp: single-step: stepi ... The difference is in the instruction(s) generated for the loop. In the passing case, we have: ... 588: eafffffe b 588 <main+0x24> ... and in the failing case: ... 588: e320f000 nop {0} 58c: eafffffd b 588 <main+0x24> ... The purpose of this part of the test-case is to: - generate a branch instruction that jumps to itself, and - set a breakpoint on it, and check that stepi-ing from that breakpoint triggers the breakpoint again. As we can see, in the failing case we failed to generate a branch instruction that jumps to itself, and consequently we cannot expect to hit the breakpoint again after issuing a single si. Fix this by issuing stepi until we hit the breakpoint. Tested on arm-linux. Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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