From: Stefan Weil Date: Thu, 13 Sep 2012 17:37:43 +0000 (+0200) Subject: w64: Fix TCG helper functions with 5 arguments X-Git-Tag: v1.3.0-rc0~460 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1b7621ad99d352629c096cba40eadc6fb2b0c294;p=thirdparty%2Fqemu.git w64: Fix TCG helper functions with 5 arguments TCG uses 6 registers for function arguments on 64 bit Linux hosts, but only 4 registers on W64 hosts. Commit 2999a0b20074a7e4a58f56572bb1436749368f59 increased the number of arguments for some important helper functions from 4 to 5 which triggered a bug for W64 hosts: QEMU aborts when executing helper_lcall_real in the guest's BIOS because function tcg_target_get_call_iarg_regs_count always returned 6. As W64 has only 4 registers for arguments, the 5th argument must be passed on the stack using a correct stack offset. Signed-off-by: Stefan Weil Signed-off-by: Aurelien Jarno --- diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c index aa1fa9ff4c6..85c6b8159e2 100644 --- a/tcg/i386/tcg-target.c +++ b/tcg/i386/tcg-target.c @@ -118,7 +118,7 @@ static void patch_reloc(uint8_t *code_ptr, int type, static inline int tcg_target_get_call_iarg_regs_count(int flags) { if (TCG_TARGET_REG_BITS == 64) { - return 6; + return ARRAY_SIZE(tcg_target_call_iarg_regs); } return 0; diff --git a/tcg/i386/tcg-target.h b/tcg/i386/tcg-target.h index b356d76312b..ace63ba37b8 100644 --- a/tcg/i386/tcg-target.h +++ b/tcg/i386/tcg-target.h @@ -67,7 +67,11 @@ typedef enum { /* used for function call generation */ #define TCG_REG_CALL_STACK TCG_REG_ESP #define TCG_TARGET_STACK_ALIGN 16 +#if defined(_WIN64) +#define TCG_TARGET_CALL_STACK_OFFSET 32 +#else #define TCG_TARGET_CALL_STACK_OFFSET 0 +#endif /* optional instructions */ #define TCG_TARGET_HAS_div2_i32 1