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mips gas: expression initialisation

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There is a make_expr_symbol in append_insn, which gets called from
macro_build, which is all over the place.  Many of these set up an
expression without initialising all fields.  Now the uninitialised
fields should not be accessed in a properly functioning assembler,
but I'm inclined to think anything copied ought to be initialised.

	* config/tc-mips.c (fix_loongson2f_jump, load_register),
	(add_got_offset, add_got_offset_hilo, macro_build_branch_likely),
	(macro, mips16_macro, s_cpload, s_cpsetup, s_cprestore)
	(s_cpreturn): Use structure initialiser to ensure all fields of
	expression are initialised.
	(load_address): Copy entire structure for the same reason.
This commit is contained in:
Alan Modra
2025-10-04 08:39:02 +09:30
parent e3f9c2f90e
commit 3fc9616817
1 changed files with 49 additions and 68 deletions
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117
gas/config/tc-mips.c
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@@ -6873,7 +6873,6 @@ fix_loongson2f_jump (struct mips_cl_insn * ip)
|| strcmp (ip->insn_mo->name, "jalr") == 0)
{
int sreg;
expressionS ep;
if (! mips_opts.at)
return;
@@ -6882,8 +6881,10 @@ fix_loongson2f_jump (struct mips_cl_insn * ip)
if (sreg == ZERO || sreg == KT0 || sreg == KT1 || sreg == ATREG)
return;
ep.X_op = O_constant;
ep.X_add_number = 0xcfff0000;
expressionS ep = {
.X_op = O_constant,
.X_add_number = 0xcfff0000
};
macro_build (&ep, "lui", "t,u", ATREG, BFD_RELOC_HI16);
ep.X_add_number = 0xffff;
macro_build (&ep, "ori", "t,r,i", ATREG, ATREG, BFD_RELOC_LO16);
@@ -9531,10 +9532,14 @@ load_register (int reg, expressionS *ep, int dbl)
generic_bignum[3] = 0;
else if (ep->X_add_number > 4)
as_bad (_("number larger than 64 bits"));
lo32.X_op = O_constant;
lo32.X_add_number = generic_bignum[0] + (generic_bignum[1] << 16);
hi32.X_op = O_constant;
hi32.X_add_number = generic_bignum[2] + (generic_bignum[3] << 16);
lo32 = (expressionS) {
.X_op = O_constant,
.X_add_number = generic_bignum[0] + (generic_bignum[1] << 16)
};
hi32 = (expressionS) {
.X_op = O_constant,
.X_add_number = generic_bignum[2] + (generic_bignum[3] << 16)
};
}
if (hi32.X_add_number == 0)
@@ -9581,9 +9586,7 @@ load_register (int reg, expressionS *ep, int dbl)
if ((hi32.X_add_number & ~(offsetT) himask) == 0
&& (lo32.X_add_number & ~(offsetT) lomask) == 0)
{
expressionS tmp;
tmp.X_op = O_constant;
expressionS tmp = { .X_op = O_constant };
if (shift < 32)
tmp.X_add_number = ((hi32.X_add_number << (32 - shift))
| (lo32.X_add_number >> shift));
@@ -9635,12 +9638,9 @@ load_register (int reg, expressionS *ep, int dbl)
shift = COUNT_TOP_ZEROES ((unsigned int) hi32.X_add_number);
if (shift != 0)
{
expressionS tmp;
/* This instruction will set the register to be all
ones. */
tmp.X_op = O_constant;
tmp.X_add_number = (offsetT) -1;
expressionS tmp = { .X_op = O_constant, .X_add_number = -1 };
macro_build (&tmp, "addiu", "t,r,j", reg, 0, BFD_RELOC_LO16);
if (bit != 0)
{
@@ -9803,7 +9803,7 @@ load_address (int reg, expressionS *ep, int *used_at)
}
else if (!mips_big_got)
{
expressionS ex;
expressionS ex = *ep;
/* If this is a reference to an external symbol, we want
lw $reg,<sym>($gp) (BFD_RELOC_MIPS_GOT16)
@@ -9821,7 +9821,6 @@ load_address (int reg, expressionS *ep, int *used_at)
{
if (ep->X_add_number)
{
ex.X_add_number = ep->X_add_number;
ep->X_add_number = 0;
relax_start (ep->X_add_symbol);
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg,
@@ -9841,7 +9840,6 @@ load_address (int reg, expressionS *ep, int *used_at)
}
else
{
ex.X_add_number = ep->X_add_number;
ep->X_add_number = 0;
macro_build (ep, ADDRESS_LOAD_INSN, "t,o(b)", reg,
BFD_RELOC_MIPS_GOT16, mips_gp_register);
@@ -9864,7 +9862,7 @@ load_address (int reg, expressionS *ep, int *used_at)
}
else if (mips_big_got)
{
expressionS ex;
expressionS ex = *ep;
/* This is the large GOT case. If this is a reference to an
external symbol, we want
@@ -9884,7 +9882,6 @@ load_address (int reg, expressionS *ep, int *used_at)
*/
if (HAVE_NEWABI)
{
ex.X_add_number = ep->X_add_number;
ep->X_add_number = 0;
relax_start (ep->X_add_symbol);
macro_build (ep, "lui", LUI_FMT, reg, BFD_RELOC_MIPS_GOT_HI16);
@@ -9911,7 +9908,6 @@ load_address (int reg, expressionS *ep, int *used_at)
}
else
{
ex.X_add_number = ep->X_add_number;
ep->X_add_number = 0;
relax_start (ep->X_add_symbol);
macro_build (ep, "lui", LUI_FMT, reg, BFD_RELOC_MIPS_GOT_HI16);
@@ -10001,12 +9997,10 @@ load_got_offset (int dest, expressionS *local)
static void
add_got_offset (int dest, expressionS *local)
{
expressionS global;
global.X_op = O_constant;
global.X_op_symbol = NULL;
global.X_add_symbol = NULL;
global.X_add_number = local->X_add_number;
expressionS global = {
.X_op = O_constant,
.X_add_number = local->X_add_number
};
relax_start (local->X_add_symbol);
macro_build (&global, ADDRESS_ADDI_INSN, "t,r,j",
@@ -10019,13 +10013,11 @@ add_got_offset (int dest, expressionS *local)
static void
add_got_offset_hilo (int dest, expressionS *local, int tmp)
{
expressionS global;
int hold_mips_optimize;
global.X_op = O_constant;
global.X_op_symbol = NULL;
global.X_add_symbol = NULL;
global.X_add_number = local->X_add_number;
expressionS global = {
.X_op = O_constant,
.X_add_number = local->X_add_number
};
relax_start (local->X_add_symbol);
load_register (tmp, &global, HAVE_64BIT_ADDRESSES);
@@ -10079,12 +10071,12 @@ macro_build_branch_likely (const char *br, const char *brneg,
unsigned int sreg, unsigned int treg)
{
int noreorder = mips_opts.noreorder;
expressionS expr1;
gas_assert (mips_opts.micromips);
start_noreorder ();
if (noreorder)
{
expressionS expr1 = { 0 };
micromips_label_expr (&expr1);
macro_build (&expr1, brneg, fmt, sreg, treg);
macro_build (NULL, "nop", "");
@@ -10347,15 +10339,9 @@ macro (struct mips_cl_insn *ip, char *str)
mask = ip->insn_mo->mask;
label_expr.X_op = O_constant;
label_expr.X_op_symbol = NULL;
label_expr.X_add_symbol = NULL;
label_expr.X_add_number = 0;
label_expr = (expressionS) { .X_op = O_constant };
expr1.X_op = O_constant;
expr1.X_op_symbol = NULL;
expr1.X_add_symbol = NULL;
expr1.X_add_number = 1;
expr1 = (expressionS) { .X_op = O_constant, .X_add_number = 1 };
align = 1;
switch (mask)
@@ -14046,10 +14032,7 @@ mips16_macro (struct mips_cl_insn *ip)
else
op[i] = -1;
expr1.X_op = O_constant;
expr1.X_op_symbol = NULL;
expr1.X_add_symbol = NULL;
expr1.X_add_number = 1;
expr1 = (expressionS) { .X_op = O_constant, .X_add_number = 1 };
dbl = 0;
@@ -17007,11 +16990,11 @@ s_cpload (int ignore ATTRIBUTE_UNUSED)
the default instruction sequence. */
in_shared = mips_in_shared || HAVE_64BIT_SYMBOLS;
ex.X_op = O_symbol;
ex.X_add_symbol = symbol_find_or_make (in_shared ? "_gp_disp" :
"__gnu_local_gp");
ex.X_op_symbol = NULL;
ex.X_add_number = 0;
ex = (expressionS) {
.X_op = O_symbol,
.X_add_symbol = symbol_find_or_make (in_shared ? "_gp_disp"
: "__gnu_local_gp")
};
/* In ELF, this symbol is implicitly an STT_OBJECT symbol. */
symbol_get_bfdsym (ex.X_add_symbol)->flags |= BSF_OBJECT;
@@ -17113,10 +17096,10 @@ s_cpsetup (int ignore ATTRIBUTE_UNUSED)
macro_start ();
if (mips_cpreturn_register == -1)
{
ex_off.X_op = O_constant;
ex_off.X_add_symbol = NULL;
ex_off.X_op_symbol = NULL;
ex_off.X_add_number = mips_cpreturn_offset;
ex_off = (expressionS) {
.X_op = O_constant,
.X_add_number = mips_cpreturn_offset
};
macro_build (&ex_off, "sd", "t,o(b)", mips_gp_register,
BFD_RELOC_LO16, SP);
@@ -17139,12 +17122,10 @@ s_cpsetup (int ignore ATTRIBUTE_UNUSED)
}
else
{
expressionS ex;
ex.X_op = O_symbol;
ex.X_add_symbol = symbol_find_or_make ("__gnu_local_gp");
ex.X_op_symbol = NULL;
ex.X_add_number = 0;
expressionS ex = {
.X_op = O_symbol,
.X_add_symbol = symbol_find_or_make ("__gnu_local_gp")
};
/* In ELF, this symbol is implicitly an STT_OBJECT symbol. */
symbol_get_bfdsym (ex.X_add_symbol)->flags |= BSF_OBJECT;
@@ -17213,10 +17194,10 @@ s_cprestore (int ignore ATTRIBUTE_UNUSED)
mips_cprestore_offset = get_absolute_expression ();
mips_cprestore_valid = 1;
ex.X_op = O_constant;
ex.X_add_symbol = NULL;
ex.X_op_symbol = NULL;
ex.X_add_number = mips_cprestore_offset;
ex = (expressionS) {
.X_op = O_constant,
.X_add_number = mips_cprestore_offset
};
mips_mark_labels ();
mips_assembling_insn = true;
@@ -17265,10 +17246,10 @@ s_cpreturn (int ignore ATTRIBUTE_UNUSED)
macro_start ();
if (mips_cpreturn_register == -1)
{
ex.X_op = O_constant;
ex.X_add_symbol = NULL;
ex.X_op_symbol = NULL;
ex.X_add_number = mips_cpreturn_offset;
ex = (expressionS) {
.X_op = O_constant,
.X_add_number = mips_cpreturn_offset
};
macro_build (&ex, "ld", "t,o(b)", mips_gp_register, BFD_RELOC_LO16, SP);
}