9ee8c2c75f
When processes have entered the kernel with one of the new trap modes, %ebp is not valid, used for stacktraces, so we need an alternative way to retrieve it to make the stacktraces valid again.
101 lines
3.0 KiB
ArmAsm
101 lines
3.0 KiB
ArmAsm
#include <minix/ipcconst.h>
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#include <machine/asm.h>
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/**========================================================================* */
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/* IPC assembly routines * */
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/**========================================================================* */
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/* all message passing routines save ebx, but destroy eax and ecx. */
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#define IPCFUNC(name,SETARGS,VEC,POSTTRAP) \
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ENTRY(usermapped_ ## name ## _softint) ;\
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push %ebp ;\
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movl %esp, %ebp ;\
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push %ebx ;\
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SETARGS ;\
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int $VEC /* trap to the kernel */ ;\
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mov %ebx, %ecx /* save %ebx */ ;\
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POSTTRAP ;\
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pop %ebx ;\
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pop %ebp ;\
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ret ;\
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ENTRY(usermapped_ ## name ## _sysenter) ;\
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push %ebp ;\
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movl %esp, %ebp ;\
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push %ebp ;\
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push %edx ;\
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push %ebx ;\
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push %esi ;\
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push %edi ;\
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movl %esp, %esi /* kernel uses %esi for restored %esp */;\
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movl $0f, %edx /* kernel uses %edx for restored %eip */;\
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movl $VEC, %edi /* %edi to distinguish ipc/kerncall */ ;\
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/* !!! There is a dependency of proc_stacktrace() ;\
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* on this stack layout; it needs to find %ebp on it. ;\
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*/ ;\
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SETARGS /* call-specific register setup */ ;\
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sysenter /* disappear into kernel */ ;\
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0: ;\
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mov %ebx, %ecx /* return w. state mangled; save %ebx */;\
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pop %edi ;\
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pop %esi ;\
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pop %ebx ;\
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pop %edx ;\
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pop %ebp ;\
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POSTTRAP ;\
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pop %ebp ;\
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ret ;\
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ENTRY(usermapped_ ## name ## _syscall) ;\
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push %ebp ;\
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movl %esp, %ebp ;\
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push %ebp ;\
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push %edx ;\
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push %ebx ;\
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push %esi ;\
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push %edi ;\
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movl $VEC, %edi /* %edi to distinguish ipc/kerncall */ ;\
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/* !!! There is a dependency of proc_stacktrace() ;\
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* on this stack layout; it needs to find %ebp on it. ;\
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*/ ;\
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SETARGS /* call-specific register setup */ ;\
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movl %ecx, %edx /* %ecx is clobbered by SYSCALL */ ;\
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syscall /* disappear into kernel */ ;\
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mov %ebx, %ecx /* return w. state mangled; save %ebx */;\
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pop %edi ;\
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pop %esi ;\
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pop %ebx ;\
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pop %edx ;\
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pop %ebp ;\
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POSTTRAP ;\
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pop %ebp ;\
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ret
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#define IPCARGS(opcode) \
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movl 8(%ebp), %eax /* eax = dest-src */ ;\
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movl 12(%ebp), %ebx /* ebx = message pointer */ ;\
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movl $opcode, %ecx ;\
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#define SENDA_ARGS \
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movl 12(%ebp), %eax /* eax = count */ ;\
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movl 8(%ebp), %ebx /* ebx = table */ ;\
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movl $SENDA, %ecx ;\
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#define GETSTATUS \
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push %eax ;\
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movl 16(%ebp), %eax /* ecx = saved %ebx */ ;\
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movl %ecx, (%eax) ;\
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pop %eax
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#define KERNARGS mov 8(%ebp), %eax
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IPCFUNC(send,IPCARGS(SEND),IPCVEC_UM,)
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IPCFUNC(receive,IPCARGS(RECEIVE),IPCVEC_UM,GETSTATUS)
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IPCFUNC(sendrec,IPCARGS(SENDREC),IPCVEC_UM,)
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IPCFUNC(sendnb,IPCARGS(SENDNB),IPCVEC_UM,)
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IPCFUNC(notify,IPCARGS(NOTIFY),IPCVEC_UM,)
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IPCFUNC(senda,SENDA_ARGS,IPCVEC_UM,)
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IPCFUNC(do_kernel_call,KERNARGS,KERVEC_UM,)
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.data
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LABEL(usermapped_offset)
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.space 4
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