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From: "tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org> To: gdb-prs@sourceware.org Subject: [Bug rust/30090] Using TUI on musl libc with Rust program, finish failed a bounds check Date: Thu, 09 Feb 2023 18:39:31 +0000 [thread overview] Message-ID: <bug-30090-4717-L42vyxXex2@http.sourceware.org/bugzilla/> (raw) In-Reply-To: <bug-30090-4717@http.sourceware.org/bugzilla/> https://sourceware.org/bugzilla/show_bug.cgi?id=30090 --- Comment #14 from Tom Tromey <tromey at sourceware dot org> --- Ok, I think I'll just have to xfail the actual result here. Basically, gdb has to rely on programs using the platform ABI to extract return values. However, my test function doesn't seem to be doing this. amd64-tdep.c thinks my type should be returned entirely in $rax, but really it's being returned in a combo of $eax and $edx. (gdb) disassemble return_some Dump of assembler code for function _ZN6finish11return_some17hc6e727e1fe11047cE: 0x000055555555c400 <+0>: push %rax 0x000055555555c401 <+1>: movl $0x61,0x4(%rsp) 0x000055555555c409 <+9>: movl $0x1,(%rsp) 0x000055555555c410 <+16>: mov (%rsp),%eax 0x000055555555c413 <+19>: mov 0x4(%rsp),%edx ^^^ here you can see eax/edx being set. 0x000055555555c417 <+23>: pop %rcx 0x000055555555c418 <+24>: ret (gdb) info regist rax 0x1 1 rbx 0x1 1 rcx 0x6100000001 416611827713 rdx 0x61 97 The caller does: 0x000055555555c420 <+0>: sub $0x18,%rsp 0x000055555555c424 <+4>: call 0x55555555c400 <_ZN6finish11return_some17hc6e727e1fe11047cE> => 0x000055555555c429 <+9>: mov %eax,0x8(%rsp) 0x000055555555c42d <+13>: mov %edx,0xc(%rsp) .. i.e., you can see it moving out of edx. Now, arguably this is maybe some reading of the ABI. amd64-tdep knows that rdx is the second integer register. But, it seems to me that since the entire structure is 8 bytes, it should probably all be stuffed into rax. -- You are receiving this mail because: You are on the CC list for the bug.
next prev parent reply other threads:[~2023-02-09 18:39 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-02-06 22:29 [Bug rust/30090] New: " sourceware.897 at alm dot website 2023-02-06 22:31 ` [Bug rust/30090] " sourceware.897 at alm dot website 2023-02-07 18:12 ` tromey at sourceware dot org 2023-02-07 22:32 ` sourceware.897 at alm dot website 2023-02-07 22:48 ` sourceware.897 at alm dot website 2023-02-08 4:32 ` tromey at sourceware dot org 2023-02-08 4:41 ` sourceware.897 at alm dot website 2023-02-08 23:50 ` tromey at sourceware dot org 2023-02-09 1:32 ` sourceware.897 at alm dot website 2023-02-09 1:39 ` sourceware.897 at alm dot website 2023-02-09 1:40 ` sourceware.897 at alm dot website 2023-02-09 2:03 ` sourceware.897 at alm dot website 2023-02-09 17:22 ` tromey at sourceware dot org 2023-02-09 17:49 ` tromey at sourceware dot org 2023-02-09 18:39 ` tromey at sourceware dot org [this message] 2023-02-09 18:58 ` tromey at sourceware dot org 2023-02-09 19:29 ` tromey at sourceware dot org 2023-02-27 18:19 ` cvs-commit at gcc dot gnu.org 2023-02-27 18:20 ` tromey at sourceware dot org
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