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target-alpha: Indicate NORETURN status when raising exception.

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When (indirectly) calling raise_exception, don't emit cleanup
code at the end of the TB, as it is unused.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2010-04-07 13:32:50 -07:00 committed by Aurelien Jarno
parent a4b388ff51
commit 8aa3fa2038
1 changed files with 14 additions and 11 deletions
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25
target-alpha/translate.c
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@ -74,7 +74,11 @@ typedef enum {
/* We are exiting the TB, but have neither emitted a goto_tb, nor
updated the PC for the next instruction to be executed. */
EXIT_PC_STALE
EXIT_PC_STALE,
/* We are ending the TB with a noreturn function call, e.g. longjmp.
No following code will be executed. */
EXIT_NORETURN,
} ExitStatus;
/* global register indexes */
@ -134,7 +138,7 @@ static void alpha_translate_init(void)
done_init = 1;
}
static inline void gen_excp(DisasContext *ctx, int exception, int error_code)
static ExitStatus gen_excp(DisasContext *ctx, int exception, int error_code)
{
TCGv_i32 tmp1, tmp2;
@ -144,11 +148,13 @@ static inline void gen_excp(DisasContext *ctx, int exception, int error_code)
gen_helper_excp(tmp1, tmp2);
tcg_temp_free_i32(tmp2);
tcg_temp_free_i32(tmp1);
return EXIT_NORETURN;
}
static inline void gen_invalid(DisasContext *ctx)
static inline ExitStatus gen_invalid(DisasContext *ctx)
{
gen_excp(ctx, EXCP_OPCDEC, 0);
return gen_excp(ctx, EXCP_OPCDEC, 0);
}
static inline void gen_qemu_ldf(TCGv t0, TCGv t1, int flags)
@ -1457,9 +1463,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
#endif
if (palcode >= 0x80 && palcode < 0xC0) {
/* Unprivileged PAL call */
gen_excp(ctx, EXCP_CALL_PAL + ((palcode & 0x3F) << 6), 0);
/* PC updated by gen_excp. */
ret = EXIT_PC_UPDATED;
ret = gen_excp(ctx, EXCP_CALL_PAL + ((palcode & 0x3F) << 6), 0);
break;
}
#ifndef CONFIG_USER_ONLY
@ -1467,7 +1471,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
/* Privileged PAL code */
if (ctx->mem_idx & 1)
goto invalid_opc;
gen_excp(ctx, EXCP_CALL_PALP + ((palcode & 0x3F) << 6), 0);
ret = gen_excp(ctx, EXCP_CALL_PALP + ((palcode & 0x3F) << 6), 0);
}
#endif
/* Invalid PAL call */
@ -3075,9 +3079,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
ret = gen_bcond(ctx, TCG_COND_GT, ra, disp21, 0);
break;
invalid_opc:
gen_invalid(ctx);
/* PC updated by gen_excp. */
ret = EXIT_PC_UPDATED;
ret = gen_invalid(ctx);
break;
}
@ -3181,6 +3183,7 @@ static inline void gen_intermediate_code_internal(CPUState *env,
switch (ret) {
case EXIT_GOTO_TB:
case EXIT_NORETURN:
break;
case EXIT_PC_STALE:
tcg_gen_movi_i64(cpu_pc, ctx.pc);