提交 1b7621ad 编写于 作者: S Stefan Weil 提交者: Aurelien Jarno

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 2999a0b2 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: NStefan Weil <sw@weilnetz.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
上级 9bacf414
......@@ -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;
......
......@@ -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
......
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