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qemu-patch-raspberry4
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target-xtensa: fix big-endian BBS/BBC implementation 

Quote from ISA, 2.1:

For most Xtensa instructions, bit numbering is irrelevant; only the BBC
and BBS instructions assign bit numbers to values on which the processor
operates. The BBC/BBS instructions use big-endian bit ordering (0 is the
most-significant bit) on a big-endian processor configuration.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
stable-1.2
Max Filippov 2012-07-17 23:45:23 +04:00 committed by Blue Swirl
parent d901eff3e6
commit 7ff7563fc1
1 changed files with 14 additions and 2 deletions
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16
target-xtensa/translate.c
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@ -2366,10 +2366,18 @@ static void disas_xtensa_insn(DisasContext *dc)
case 5: /*BBC*/ /*BBS*/
gen_window_check2(dc, RRI8_S, RRI8_T);
{
TCGv_i32 bit = tcg_const_i32(1);
#ifdef TARGET_WORDS_BIGENDIAN
TCGv_i32 bit = tcg_const_i32(0x80000000);
#else
TCGv_i32 bit = tcg_const_i32(0x00000001);
#endif
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_andi_i32(tmp, cpu_R[RRI8_T], 0x1f);
#ifdef TARGET_WORDS_BIGENDIAN
tcg_gen_shr_i32(bit, bit, tmp);
#else
tcg_gen_shl_i32(bit, bit, tmp);
#endif
tcg_gen_and_i32(tmp, cpu_R[RRI8_S], bit);
gen_brcondi(dc, eq_ne, tmp, 0, 4 + RRI8_IMM8_SE);
tcg_temp_free(tmp);
@ -2383,7 +2391,11 @@ static void disas_xtensa_insn(DisasContext *dc)
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_andi_i32(tmp, cpu_R[RRI8_S],
1 << (((RRI8_R & 1) << 4) | RRI8_T));
#ifdef TARGET_WORDS_BIGENDIAN
0x80000000 >> (((RRI8_R & 1) << 4) | RRI8_T));
#else
0x00000001 << (((RRI8_R & 1) << 4) | RRI8_T));
#endif
gen_brcondi(dc, eq_ne, tmp, 0, 4 + RRI8_IMM8_SE);
tcg_temp_free(tmp);
}