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Replace pointer casts with calls to (read|write)(16|32|64)le.

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This stops UBSan from giving runtime misaligned address errors
and might eventually allow building on a non-little-endian host.
This commit is contained in:
Edmund Grimley Evans
2015-11-19 18:21:14 +00:00
parent 5d496b1695
commit 553242c18a
5 changed files with 185 additions and 170 deletions
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25
x86_64-gen.c
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@ -214,11 +214,10 @@ void orex(int ll, int r, int r2, int b)
/* output a symbol and patch all calls to it */
void gsym_addr(int t, int a)
{
int n, *ptr;
while (t) {
ptr = (int *)(cur_text_section->data + t);
n = *ptr; /* next value */
*ptr = a - t - 4;
unsigned char *ptr = cur_text_section->data + t;
uint32_t n = read32le(ptr); /* next value */
write32le(ptr, a - t - 4);
t = n;
}
}
@ -248,7 +247,7 @@ ST_FUNC int oad(int c, int s)
ind1 = ind + 4;
if (ind1 > cur_text_section->data_allocated)
section_realloc(cur_text_section, ind1);
*(int *)(cur_text_section->data + ind) = s;
write32le(cur_text_section->data + ind, s);
s = ind;
ind = ind1;
return s;
@ -1691,9 +1690,7 @@ void gjmp_addr(int a)
/* generate a test. set 'inv' to invert test. Stack entry is popped */
int gtst(int inv, int t)
{
int v, t1, *p;
v = vtop->r & VT_VALMASK;
int v = vtop->r & VT_VALMASK;
if (v == VT_CMP) {
/* fast case : can jump directly since flags are set */
if (vtop->c.i & 0x100)
@ -1719,14 +1716,12 @@ int gtst(int inv, int t)
} else if (v == VT_JMP || v == VT_JMPI) {
/* && or || optimization */
if ((v & 1) == inv) {
uint32_t n1, n = vtop->c.i;
/* insert vtop->c jump list in t */
t1 = vtop->c.i;
p = &t1;
while (*p != 0)
p = (int *)(cur_text_section->data + *p);
*p = t;
vtop->c.i = t1;
t = t1;
while ((n1 = read32le(cur_text_section->data + n)))
n = n1;
write32le(cur_text_section->data + n, t);
t = vtop->c.i;
} else {
t = gjmp(t);
gsym(vtop->c.i);