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From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@linaro.org>
To: qemu-devel@nongnu.org
Cc: Max Filippov <jcmvbkbc@gmail.com>,
Richard Henderson <richard.henderson@linaro.org>,
=?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@linaro.org>
Subject: [PATCH 1/2] target/xtensa: Implement xtensa_isa_is_big_endian()
Date: Fri, 6 Dec 2024 00:24:36 +0100
Message-ID: <20241205232437.85235-2-philmd@linaro.org>
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Xtensa internal fields are opaque, only accessible by
the Xtensa libisa. Implement xtensa_isa_is_big_endian()
to get vCPU endianness. This should be implemented in
libisa, not QEMU, but I couldn't figure out where to
contribute this.
Signed-off-by: Philippe Mathieu-Daud=C3=A9 <philmd@linaro.org>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
---
include/hw/xtensa/xtensa-isa.h | 1 +
target/xtensa/xtensa-isa.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/include/hw/xtensa/xtensa-isa.h b/include/hw/xtensa/xtensa-isa.h
index a289531bdc8..1cb8e6ccb66 100644
--- a/include/hw/xtensa/xtensa-isa.h
+++ b/include/hw/xtensa/xtensa-isa.h
@@ -829,6 +829,7 @@ const char *xtensa_funcUnit_name(xtensa_isa isa, xtensa=
_funcUnit fun);
=20
int xtensa_funcUnit_num_copies(xtensa_isa isa, xtensa_funcUnit fun);
=20
+bool xtensa_isa_is_big_endian(xtensa_isa isa);
=20
#ifdef __cplusplus
}
diff --git a/target/xtensa/xtensa-isa.c b/target/xtensa/xtensa-isa.c
index 630b4f9da1b..36eb4bcf3d4 100644
--- a/target/xtensa/xtensa-isa.c
+++ b/target/xtensa/xtensa-isa.c
@@ -1741,3 +1741,10 @@ int xtensa_funcUnit_num_copies(xtensa_isa isa, xtens=
a_funcUnit fun)
CHECK_FUNCUNIT(intisa, fun, XTENSA_UNDEFINED);
return intisa->funcUnits[fun].num_copies;
}
+
+bool xtensa_isa_is_big_endian(xtensa_isa isa)
+{
+ xtensa_isa_internal *intisa =3D (xtensa_isa_internal *)isa;
+
+ return intisa->is_big_endian;
+}
--=20
2.45.2
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From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@linaro.org>
To: qemu-devel@nongnu.org
Cc: Max Filippov <jcmvbkbc@gmail.com>,
Richard Henderson <richard.henderson@linaro.org>,
=?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@linaro.org>
Subject: [PATCH 2/2] target/xtensa: Remove tswap() calls in semihosting
simcall() helper
Date: Fri, 6 Dec 2024 00:24:37 +0100
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In preparation of heterogeneous emulation where cores with
different endianness can run concurrently, we need to remove
the tswap() calls -- which use a fixed per-binary endianness.
Get the endianness of the CPU accessed using the libisa
xtensa_isa_is_big_endian() call and replace the tswap() calls
by bswap() ones when necessary.
Signed-off-by: Philippe Mathieu-Daud=C3=A9 <philmd@linaro.org>
---
target/xtensa/xtensa-semi.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/target/xtensa/xtensa-semi.c b/target/xtensa/xtensa-semi.c
index fa21b7e11fc..21d23e39de5 100644
--- a/target/xtensa/xtensa-semi.c
+++ b/target/xtensa/xtensa-semi.c
@@ -328,10 +328,17 @@ void HELPER(simcall)(CPUXtensaState *env)
struct timeval tv =3D {0};
=20
if (target_tv) {
+ bool cpu_big_endian =3D xtensa_isa_is_big_endian(env->conf=
ig->isa);
+ bool swap_needed =3D HOST_BIG_ENDIAN !=3D cpu_big_endian;
+
cpu_memory_rw_debug(cs, target_tv,
(uint8_t *)target_tvv, sizeof(target_tvv), 0);
- tv.tv_sec =3D (int32_t)tswap32(target_tvv[0]);
- tv.tv_usec =3D (int32_t)tswap32(target_tvv[1]);
+ if (swap_needed) {
+ bswap32s(&target_tvv[0]);
+ bswap32s(&target_tvv[1]);
+ }
+ tv.tv_sec =3D (int32_t)target_tvv[0];
+ tv.tv_usec =3D (int32_t)target_tvv[1];
}
if (fd < 3 && sim_console) {
if ((fd =3D=3D 1 || fd =3D=3D 2) && rq =3D=3D SELECT_ONE_W=
RITE) {
@@ -381,6 +388,8 @@ void HELPER(simcall)(CPUXtensaState *env)
int argc =3D semihosting_get_argc();
int str_offset =3D (argc + 1) * sizeof(uint32_t);
int i;
+ bool cpu_big_endian =3D xtensa_isa_is_big_endian(env->config->=
isa);
+ bool swap_needed =3D HOST_BIG_ENDIAN !=3D cpu_big_endian;
uint32_t argptr;
=20
for (i =3D 0; i < argc; ++i) {
@@ -388,6 +397,9 @@ void HELPER(simcall)(CPUXtensaState *env)
int str_size =3D strlen(str) + 1;
=20
argptr =3D tswap32(regs[3] + str_offset);
+ if (swap_needed) {
+ bswap32s(&argptr);
+ }
=20
cpu_memory_rw_debug(cs,
regs[3] + i * sizeof(uint32_t),
--=20
2.45.2