openkylin
/
qemu
mirror of https://gitee.com/openkylin/qemu.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

target-alpha: Indicate NORETURN status when raising exception. 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
target-alpha/translate.c
View File

@ -74,7 +74,11 @@ typedef enum {
/* We are exiting the TB, but have neither emitted a goto_tb, nor /* We are exiting the TB, but have neither emitted a goto_tb, nor
updated the PC for the next instruction to be executed. */ 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; } ExitStatus;
/* global register indexes */ /* global register indexes */
@ -134,7 +138,7 @@ static void alpha_translate_init(void)
done_init = 1; 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; 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); gen_helper_excp(tmp1, tmp2);
tcg_temp_free_i32(tmp2); tcg_temp_free_i32(tmp2);
tcg_temp_free_i32(tmp1); 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) 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 #endif
if (palcode >= 0x80 && palcode < 0xC0) { if (palcode >= 0x80 && palcode < 0xC0) {
/* Unprivileged PAL call */ /* Unprivileged PAL call */
gen_excp(ctx, EXCP_CALL_PAL + ((palcode & 0x3F) << 6), 0); ret = gen_excp(ctx, EXCP_CALL_PAL + ((palcode & 0x3F) << 6), 0);
/* PC updated by gen_excp. */
ret = EXIT_PC_UPDATED;
break; break;
} }
#ifndef CONFIG_USER_ONLY #ifndef CONFIG_USER_ONLY
@ -1467,7 +1471,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
/* Privileged PAL code */ /* Privileged PAL code */
if (ctx->mem_idx & 1) if (ctx->mem_idx & 1)
goto invalid_opc; 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 #endif
/* Invalid PAL call */ /* 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); ret = gen_bcond(ctx, TCG_COND_GT, ra, disp21, 0);
break; break;
invalid_opc: invalid_opc:
gen_invalid(ctx); ret = gen_invalid(ctx);
/* PC updated by gen_excp. */
ret = EXIT_PC_UPDATED;
break; break;
} }
@ -3181,6 +3183,7 @@ static inline void gen_intermediate_code_internal(CPUState *env,
switch (ret) { switch (ret) {
case EXIT_GOTO_TB: case EXIT_GOTO_TB:
case EXIT_NORETURN:
break; break;
case EXIT_PC_STALE: case EXIT_PC_STALE:
tcg_gen_movi_i64(cpu_pc, ctx.pc); tcg_gen_movi_i64(cpu_pc, ctx.pc);