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Fix Quad handling on 64-bit architectures. On 64-bit machines, a Quad

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also occupies a single slot. There's no need for any special handling
of Quads. While here, remove the silly make_quad() function. We have
the 2 longs on 32-bit machines already lined up in the argument array,
so we can fetch the Quad with a simple cast.

Before:
  lseek(1,0x123456789,0xd0d0d0d0d0d0d0d0) = 4886718345 (0x123456789)
After:
  lseek(1,0x123456789,SEEK_SET)           = 4886718345 (0x123456789)
This commit is contained in:
Marcel Moolenaar 2004-09-05 05:27:30 +00:00
parent b5d47ff592
commit 10aeefc913
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=134799
1 changed files with 17 additions and 22 deletions
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39
usr.bin/truss/syscalls.c
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@ -73,11 +73,19 @@ struct syscall syscalls[] = {
{ "readlink", 1, 3,
{ { String, 0 } , { Readlinkres | OUT, 1 }, { Int, 2 }}},
{ "lseek", 2, 3,
#ifdef __LP64__
{ { Int, 0 }, {Quad, 2 }, { Whence, 3 }}},
#else
{ { Int, 0 }, {Quad, 2 }, { Whence, 4 }}},
#endif
{ "linux_lseek", 2, 3,
{ { Int, 0 }, {Int, 1 }, { Whence, 2 }}},
{ "mmap", 2, 6,
#ifdef __LP64__
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}, {Mmapflags, 3}, {Int, 4}, {Quad, 5}}},
#else
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}, {Mmapflags, 3}, {Int, 4}, {Quad, 6}}},
#endif
{ "mprotect", 1, 3,
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}}},
{ "open", 1, 3,
@ -233,22 +241,6 @@ get_string(int procfd, void *offset, int max) {
}
/*
* Gag. This is really unportable. Multiplication is more portable.
* But slower, from the code I saw.
*/
static long long
make_quad(unsigned long p1, unsigned long p2) {
union {
long long ll;
unsigned long l[2];
} t;
t.l[0] = p1;
t.l[1] = p2;
return t.ll;
}
/*
* Remove a trailing '|' in a string, useful for fixup after decoding
* a "flags" argument.
@ -327,16 +319,19 @@ print_arg(int fd, struct syscall_args *sc, unsigned long *args, long retval) {
tmp2 += sprintf(tmp2, "]");
}
break;
#ifdef __LP64__
case Quad:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
#else
case Quad:
{
unsigned long long t;
unsigned long l1, l2;
l1 = args[sc->offset];
l2 = args[sc->offset+1];
t = make_quad(l1, l2);
asprintf(&tmp, "0x%llx", t);
unsigned long long ll;
ll = *(unsigned long long *)(args + sc->offset);
asprintf(&tmp, "0x%llx", ll);
break;
}
#endif
case Ptr:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;