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truss: fix handling of 64-bit arguments/return values for compat32 

Deciding whether to combine two values to a 64-bit one should be based on
the process ABI, and not dependent on whether truss is compiled for an
LP64 ABI. This is a follow-up cleanup for D27625. I found this while
looking for uses of the `__LP64__` macro (since using this is wrong for
CHERI systems).

Test Plan: truss still works. Since I tested on AMD64 and all syscalls
in the trace have their quad argument last there was no difference
in the output. Should fix output for compat32 on MIPS64 though.

Reviewed By:	jhb
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D27637
This commit is contained in:
Alex Richardson 2021-06-16 16:29:57 +01:00
parent 1a3a57d745
commit 8ba2e89e98
1 changed files with 17 additions and 23 deletions
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36
usr.bin/truss/syscalls.c
View File

@ -1908,32 +1908,29 @@ print_arg(struct syscall_arg *sc, unsigned long *args, register_t *retval,
fputs(" ]", fp);
break;
}
#ifdef __LP64__
case Quad:
fprintf(fp, "%ld", args[sc->offset]);
break;
case QuadHex:
fprintf(fp, "0x%lx", args[sc->offset]);
break;
#else
case Quad:
case QuadHex: {
unsigned long long ll;
uint64_t value;
size_t pointer_size =
trussinfo->curthread->proc->abi->pointer_size;
if (pointer_size == 4) {
#if _BYTE_ORDER == _LITTLE_ENDIAN
ll = (unsigned long long)args[sc->offset + 1] << 32 |
value = (uint64_t)args[sc->offset + 1] << 32 |
args[sc->offset];
#else
ll = (unsigned long long)args[sc->offset] << 32 |
value = (uint64_t)args[sc->offset] << 32 |
args[sc->offset + 1];
#endif
} else {
value = (uint64_t)args[sc->offset];
}
if ((sc->type & ARG_MASK) == Quad)
fprintf(fp, "%lld", ll);
fprintf(fp, "%jd", (intmax_t)value);
else
fprintf(fp, "0x%llx", ll);
fprintf(fp, "0x%jx", (intmax_t)value);
break;
}
#endif
case PQuadHex: {
uint64_t val;
@ -3015,11 +3012,9 @@ print_syscall_ret(struct trussinfo *trussinfo, int error, register_t *retval)
fprintf(trussinfo->outfile, " ERR#%d '%s'\n",
sysdecode_freebsd_to_abi_errno(t->proc->abi->abi, error),
strerror(error));
}
#ifndef __LP64__
else if (sc->decode.ret_type == 2) {
} else if (sc->decode.ret_type == 2 &&
t->proc->abi->pointer_size == 4) {
off_t off;
#if _BYTE_ORDER == _LITTLE_ENDIAN
off = (off_t)retval[1] << 32 | retval[0];
#else
@ -3027,11 +3022,10 @@ print_syscall_ret(struct trussinfo *trussinfo, int error, register_t *retval)
#endif
fprintf(trussinfo->outfile, " = %jd (0x%jx)\n", (intmax_t)off,
(intmax_t)off);
}
#endif
else
} else {
fprintf(trussinfo->outfile, " = %jd (0x%jx)\n",
(intmax_t)retval[0], (intmax_t)retval[0]);
}
}
void