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author | Greg Hartman <ghartman@google.com> | 2016-11-23 15:51:27 -0800 |
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committer | Greg Hartman <ghartman@google.com> | 2016-11-23 15:52:24 -0800 |
commit | 76d05dc695b06c4e987bb8078f78032441e1430c (patch) | |
tree | 7b567ae0c1fde3fd699b8839ca39b54aa1c10046 /core/callback.inc | |
parent | 49db3fec5f3681cf8fafd57c8987fcff2d40bc89 (diff) | |
download | syslinux-oreo-m4-s6-release.tar.gz |
Clean checkin of the 6.03 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android-8.0.0_r10android-8.0.0_r1security-oc-releasesecurity-oc-mr1-releaseoreo-vts-releaseoreo-security-releaseoreo-releaseoreo-r6-releaseoreo-r5-releaseoreo-r4-releaseoreo-r3-releaseoreo-r2-releaseoreo-mr1-wear-releaseoreo-mr1-vts-releaseoreo-mr1-security-releaseoreo-mr1-s1-releaseoreo-mr1-releaseoreo-mr1-iot-releaseoreo-mr1-devoreo-mr1-cuttlefish-testingoreo-mr1-cts-releaseoreo-mr1-1.2-iot-releaseoreo-m8-releaseoreo-m7-releaseoreo-m6-s4-releaseoreo-m6-s3-releaseoreo-m6-s2-releaseoreo-m5-releaseoreo-m4-s9-releaseoreo-m4-s8-releaseoreo-m4-s7-releaseoreo-m4-s6-releaseoreo-m4-s5-releaseoreo-m4-s4-releaseoreo-m4-s3-releaseoreo-m4-s2-releaseoreo-m4-s12-releaseoreo-m4-s11-releaseoreo-m4-s10-releaseoreo-m4-s1-releaseoreo-m3-releaseoreo-m2-s5-releaseoreo-m2-s4-releaseoreo-m2-s3-releaseoreo-m2-s2-releaseoreo-m2-s1-releaseoreo-m2-releaseoreo-dr3-releaseoreo-dr2-releaseoreo-dr1-releaseoreo-dr1-devoreo-devoreo-cts-releaseo-preview-4o-preview-3o-preview-2o-mr1-iot-preview-8o-mr1-iot-preview-7o-mr1-iot-preview-6o-iot-preview-5
BUG: 32495852
Change-Id: I5038a3bb41e217380c1188463daec07b1e9b6b48
Diffstat (limited to 'core/callback.inc')
-rw-r--r-- | core/callback.inc | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/core/callback.inc b/core/callback.inc new file mode 100644 index 0000000..f1332e8 --- /dev/null +++ b/core/callback.inc @@ -0,0 +1,226 @@ +;; ----------------------------------------------------------------------- +;; +;; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved +;; Copyright 2009 Intel Corporation; author: H. Peter Anvin +;; +;; This program is free software; you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation, Inc., 53 Temple Place Ste 330, +;; Boston MA 02111-1307, USA; either version 2 of the License, or +;; (at your option) any later version; incorporated herein by reference. +;; +;; ----------------------------------------------------------------------- + +;; +;; callback.inc +;; +;; Callbacks from 32-bit mode to 16-bit mode +;; + +; +; 16-bit intcall/farcall handling code +; + +; +; 32-bit support code +; + bits 32 + section .text + +; +; Intcall/farcall invocation. We manifest a structure on the real-mode stack, +; containing the com32sys_t structure from <com32.h> as well as +; the following entries (from low to high address): +; - Target offset +; - Target segment +; - Return offset +; - Return segment (== real mode cs == 0) +; - Return flags +; + global core_farcall:function hidden +core_farcall: + mov eax,[esp+1*4] ; CS:IP + jmp core_syscall + + global core_intcall:function hidden +core_intcall: + movzx eax,byte [esp+1*4] ; INT number + mov eax,[eax*4] ; Get CS:IP from low memory + +core_syscall: + pushfd ; Save IF among other things... + inc dword [CallbackCtr] + push ebx + push ebp + push esi + push edi + push dword [CallbackSP] + + cld + + movzx edi,word [word RealModeSSSP] + movzx ebx,word [word RealModeSSSP+2] + sub edi,54 ; Allocate 54 bytes + mov [word RealModeSSSP],di + shl ebx,4 + add edi,ebx ; Create linear address + + mov esi,[esp+8*4] ; Source regs + xor ecx,ecx + mov cl,11 ; 44 bytes to copy + rep movsd + + ; EAX is already set up to be CS:IP + stosd ; Save in stack frame + mov eax,.rm_return ; Return seg:offs + stosd ; Save in stack frame + mov eax,[edi-12] ; Return flags + and eax,0x200ed7 ; Mask (potentially) unsafe flags + mov [edi-12],eax ; Primary flags entry + stosw ; Return flags + + mov bx,.rm + jmp enter_rm ; Go to real mode + + bits 16 + section .text16 +.rm: + mov ax,sp + add ax,9*4+4*2 + mov [CallbackSP],ax + pop gs + pop fs + pop es + pop ds + popad + popfd + retf ; Invoke routine + +.rm_return: + ; We clean up SP here because we don't know if the + ; routine returned with RET, RETF or IRET + mov sp,[cs:CallbackSP] + pushfd + pushad + push ds + push es + push fs + push gs + mov ebx,.pm_return + jmp enter_pm + + ; On return, the 44-byte return structure is on the + ; real-mode stack, plus the 10 additional bytes used + ; by the target address (see above.) + bits 32 + section .text +.pm_return: + movzx esi,word [word RealModeSSSP] + movzx eax,word [word RealModeSSSP+2] + mov edi,[esp+9*4] ; Dest regs + shl eax,4 + add esi,eax ; Create linear address + and edi,edi ; NULL pointer? + jnz .do_copy +.no_copy: mov edi,esi ; Do a dummy copy-to-self +.do_copy: xor ecx,ecx + mov cl,11 ; 44 bytes + rep movsd ; Copy register block + + add dword [word RealModeSSSP],54 + ; Remove from stack + + pop dword [CallbackSP] + dec dword [CallbackCtr] + jnz .skip + call [core_pm_hook] +.skip: + pop edi + pop esi + pop ebp + pop ebx + popfd + ret ; Return to 32-bit program + +; +; Cfarcall invocation. We copy the stack frame to the real-mode stack, +; followed by the return CS:IP and the CS:IP of the target function. +; The value of IF is copied from the calling routine. +; + global core_cfarcall:function hidden +core_cfarcall: + pushfd ; Save IF among other things... + inc dword [CallbackCtr] + push ebx + push ebp + push esi + push edi + push dword [CallbackSP] + + cld + mov ecx,[esp+9*4] ; Size of stack frame + + movzx edi,word [word RealModeSSSP] + movzx ebx,word [word RealModeSSSP+2] + mov [word CallbackSP],di + sub edi,ecx ; Allocate space for stack frame + and edi,~3 ; Round + sub edi,4*3 ; Return pointer, return value, EFLAGS + mov [word RealModeSSSP],di + shl ebx,4 + add edi,ebx ; Create linear address + + mov eax,[esp+5*4] ; EFLAGS from entry + and eax,0x202 ; IF only + stosd + mov eax,[esp+7*4] ; CS:IP + stosd ; Save to stack frame + mov eax,.rm_return ; Return seg:off + stosd + mov esi,[esp+8*4] ; Stack frame + mov eax,ecx ; Copy the stack frame + shr ecx,2 + rep movsd + mov ecx,eax + and ecx,3 + rep movsb + + mov bx,.rm + jmp enter_rm + + bits 16 + section .text16 +.rm: + popfd + retf +.rm_return: + mov sp,[cs:CallbackSP] + mov esi,eax + mov ebx,.pm_return + jmp enter_pm + + bits 32 + section .text +.pm_return: + mov eax,esi + ; EDX already set up to be the RM return value + pop dword [CallbackSP] + dec dword [CallbackCtr] + jnz .skip + call [core_pm_hook] +.skip: + pop ebx + pop ebp + pop esi + pop edi + popfd + ret + + section .bss16 + alignb 4 + global core_pm_hook +CallbackSP resd 1 ; SP saved during callback +CallbackCtr resd 1 + + bits 16 + section .text16 |