On Tue, Apr 17, 2012 at 5:13 PM, Dmitry V. Levin <[email protected]> wrote: > On Tue, Apr 17, 2012 at 05:03:20PM -0700, H.J. Lu wrote: >> On Tue, Apr 17, 2012 at 4:58 PM, Dmitry V. Levin <[email protected]> wrote: >> > On Tue, Apr 17, 2012 at 11:05:04AM -0700, H.J. Lu wrote: >> >> Hi, >> >> >> >> This patch adds ia32 support to x32 strace. Tested on Linux/x32. >> > [...] >> >> @@ -868,15 +874,14 @@ get_scno(struct tcb *tcp) >> >> } >> >> # endif >> >> # ifdef X32 >> >> - if (currpers == 0 || currpers == 1) { >> >> - fprintf(stderr, "syscall_%lu (...) in unsupported %s " >> >> - "mode of process PID=%d\n", scno, >> >> - currpers == 0 ? "64-bit" : "32-bit", tcp->pid); >> >> + if (currpers == 0) { >> >> + fprintf(stderr, "syscall_%lu (...) in unsupported 64-bit " >> >> + "mode of process PID=%d\n", scno, tcp->pid); >> >> return 0; >> >> } >> >> -# else >> >> - update_personality(tcp, currpers); >> >> + else if (currpers == 1) >> >> # endif >> >> + update_personality(tcp, currpers); >> >> #elif defined(IA64) >> >> # define IA64_PSR_IS ((long)1 << 34) >> >> if (upeek(tcp, PT_CR_IPSR, &psr) >= 0) >> > >> > This part of the change seems to be wrong: if strace supports two >> > personalities >> > on X32, it should be able to switch to any of them, not just to >> > currpers == 1. Looks like additional currpers translation is needed for >> > the X32 case. >> >> currpers is set the same value for both x32 and x86-64 strace, >> >> 0: x86-64 >> 1: ia32 >> 2. x32 >> >> For x32 strace, when currpers == 1, we call update_personality to update >> personality. When currpers == 2, we do nothing since the current >> personality is x32. > > We have to handle the case when currpers == 2 and current_personality == 1. > Supposing that currpers == 2 on X32 translates to current_personality == 0, > we have to call update_personality(tcp, 0) in that case. >
Here is the updated patch to set currpers == 0 for x32. Thanks. -- H.J.
strace-ia32-2.patch
Description: Binary data
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