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| author | Richard Henderson <rth@twiddle.net> | 2010-06-14 17:35:27 -0700 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2010-06-16 11:29:11 +0200 |
| commit | 2bece2c88331f024a46527634e3dd91c71d22141 (patch) | |
| tree | 2275cb777821df8aa66ea092bae2124b9923d01b /tcg/s390/tcg-target.h | |
| parent | d2c5efd89fe319f150aba0b67e394f23f6c07ba6 (diff) | |
| download | qemu-2bece2c88331f024a46527634e3dd91c71d22141.zip | |
tcg: Optionally sign-extend 32-bit arguments for 64-bit hosts.
Some hosts (amd64, ia64) have an ABI that ignores the high bits
of the 64-bit register when passing 32-bit arguments. Others
require the value to be properly sign-extended for the type.
I.e. "int32_t" must be sign-extended and "uint32_t" must be
zero-extended to 64-bits.
To effect this, extend the "sizemask" parameter to tcg_gen_callN
to include the signedness of the type of each parameter. If the
tcg target requires it, extend each 32-bit argument into a 64-bit
temp and pass that to the function call.
This ABI feature is required by sparc64, ppc64 and s390x.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg/s390/tcg-target.h')
| -rw-r--r-- | tcg/s390/tcg-target.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tcg/s390/tcg-target.h b/tcg/s390/tcg-target.h index d7fe0c71ca..8c19262fb8 100644 --- a/tcg/s390/tcg-target.h +++ b/tcg/s390/tcg-target.h @@ -87,6 +87,8 @@ enum { #define TCG_TARGET_STACK_ALIGN 8 #define TCG_TARGET_CALL_STACK_OFFSET 0 +#define TCG_TARGET_EXTEND_ARGS 1 + enum { /* Note: must be synced with dyngen-exec.h */ TCG_AREG0 = TCG_REG_R10, |