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[FREELDR/AMD64]

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Save parameter registers (rcx, rdx) before calling CallRealMode. Patch by andy-123, applied to a secondary location by me.
CORE-10511 #resolve #comment Thanks. I added the same fix to PnpBiosGet below.

svn path=/trunk/; revision=70407
This commit is contained in:
Timo Kreuzer 2015-12-21 19:36:10 +00:00
parent 03e066f2f1
commit cf2573f733
1 changed files with 14 additions and 0 deletions
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14
reactos/boot/freeldr/freeldr/arch/amd64/pnpbios.S
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@ -104,10 +104,18 @@ pnp_not_found:
PUBLIC PnpBiosGetDeviceNodeCount PUBLIC PnpBiosGetDeviceNodeCount
PnpBiosGetDeviceNodeCount: PnpBiosGetDeviceNodeCount:
/* Save param-regs */
push rcx
push rdx
/* Call the real mode function */ /* Call the real mode function */
mov bx, FNID_PnpBiosGetDeviceNodeCount mov bx, FNID_PnpBiosGetDeviceNodeCount
call CallRealMode call CallRealMode
/* Restore param-regs */
pop rdx
pop rcx
xor eax, eax xor eax, eax
mov ax, [BSS_PnpNodeSize] mov ax, [BSS_PnpNodeSize]
mov [rcx], eax mov [rcx], eax
@ -140,10 +148,16 @@ PnpBiosGetDeviceNode:
and eax, HEX(0f) and eax, HEX(0f)
mov word ptr [BSS_PnpBiosBufferOffset], ax mov word ptr [BSS_PnpBiosBufferOffset], ax
/* Save rcx */
push rcx
/* Call the real mode function */ /* Call the real mode function */
mov bx, FNID_PnpBiosGetDeviceNode mov bx, FNID_PnpBiosGetDeviceNode
call CallRealMode call CallRealMode
/* Restore rcx */
pop rcx
/* update node number */ /* update node number */
mov al, byte ptr [BSS_PnpNodeNumber] mov al, byte ptr [BSS_PnpNodeNumber]
mov [rcx], al mov [rcx], al