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tcg/sparc64: Disable direct linking for goto_tb

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Something is wrong with this code, and also wrong with gdb on the
sparc systems to which I have access, so I cannot debug it either.
Disable for now, so the release is not broken.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-04-04 08:03:40 -07:00
parent 3371802fba
commit 1ffbe5d681
1 changed files with 4 additions and 26 deletions
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30
tcg/sparc64/tcg-target.c.inc
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@ -1445,12 +1445,12 @@ static void tcg_out_goto_tb(TCGContext *s, int which)
{
ptrdiff_t off = tcg_tbrel_diff(s, (void *)get_jmp_target_addr(s, which));
/* Direct branch will be patched by tb_target_set_jmp_target. */
/* Load link and indirect branch. */
set_jmp_insn_offset(s, which);
tcg_out32(s, CALL);
/* delay slot */
tcg_debug_assert(check_fit_ptr(off, 13));
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TB, TCG_REG_TB, off);
tcg_out_arithi(s, TCG_REG_G0, TCG_REG_TB, 0, JMPL);
/* delay slot */
tcg_out_nop(s);
set_jmp_reset_offset(s, which);
/*
@ -1469,28 +1469,6 @@ static void tcg_out_goto_tb(TCGContext *s, int which)
void tb_target_set_jmp_target(const TranslationBlock *tb, int n,
uintptr_t jmp_rx, uintptr_t jmp_rw)
{
uintptr_t addr = tb->jmp_target_addr[n];
intptr_t br_disp = (intptr_t)(addr - jmp_rx) >> 2;
tcg_insn_unit insn;
br_disp >>= 2;
if (check_fit_ptr(br_disp, 19)) {
/* ba,pt %icc, addr */
insn = deposit32(INSN_OP(0) | INSN_OP2(1) | INSN_COND(COND_A)
| BPCC_ICC | BPCC_PT, 0, 19, br_disp);
} else if (check_fit_ptr(br_disp, 22)) {
/* ba addr */
insn = deposit32(INSN_OP(0) | INSN_OP2(2) | INSN_COND(COND_A),
0, 22, br_disp);
} else {
/* The code_gen_buffer can't be larger than 2GB. */
tcg_debug_assert(check_fit_ptr(br_disp, 30));
/* call addr */
insn = deposit32(CALL, 0, 30, br_disp);
}
qatomic_set((uint32_t *)jmp_rw, insn);
flush_idcache_range(jmp_rx, jmp_rw, 4);
}
static void tcg_out_op(TCGContext *s, TCGOpcode opc,