kernel32: On process entry store PEB address in %ebx.

8k demo custom PE loader depends on this. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=42125Signed-off-by: Dmitry Timoshkov <dmitry@baikal.ru> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

kernel32: On process entry store PEB address in %ebx.
360820fb · Dmitry Timoshkov · Alexandre Julliard · a0772da5 · 360820fb
Commit 360820fb authored May 06, 2020 by Dmitry Timoshkov Committed by Alexandre Julliard May 15, 2020
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process.c dlls/kernel32/process.c +9 -3

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--- a/dlls/kernel32/process.c
+++ b/dlls/kernel32/process.c
@@ -94,12 +94,18 @@ __ASM_GLOBAL_FUNC( call_process_entry,
                    __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
                    "movl %esp,%ebp\n\t"
                    __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
-                    "pushl 4(%ebp)\n\t"  /* deliberately mis-align the stack by 8, Doom 3 needs this */
+                    "pushl %ebx\n\t"
+                    __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
+                    "movl 8(%ebp),%ebx\n\t"
+                    /* deliberately mis-align the stack by 8, Doom 3 needs this */
                    "pushl 4(%ebp)\n\t"  /* Driller expects readable address at this offset */
                    "pushl 4(%ebp)\n\t"
-                    "pushl 8(%ebp)\n\t"
+                    "pushl %ebx\n\t"
                    "call *12(%ebp)\n\t"
-                    "leave\n\t"
+                    "leal -4(%ebp),%esp\n\t"
+                    "popl %ebx\n\t"
+                    __ASM_CFI(".cfi_same_value %ebx\n\t")
+                    "popl %ebp\n\t"
                    __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
                    __ASM_CFI(".cfi_same_value %ebp\n\t")
                    "ret" )