do not preserve caller-saved registers
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parent
6a0d86c754
commit
d3e865438f
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@ -20,19 +20,19 @@ The registers_t variable is in (%esp)
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swap_registers:
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// save the old context
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movl 4(%esp), %eax
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//movl %eax, 0(%eax)
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movl %ebx, 4(%eax)
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movl %ecx, 8(%eax)
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movl %edx, 12(%eax)
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movl %ebp, 16(%eax)
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movl %esi, 20(%eax)
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movl %edi, 24(%eax)
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//movl %cs, 32(%eax)
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//movl %ds, 34(%eax)
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//movl %ss, 36(%eax)
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//movl %es, 38(%eax)
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//movl %fs, 40(%eax)
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//movl %gs, 42(%eax)
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//movl %eax, 0(%eax)
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movl %ebx, 4(%eax)
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//movl %ecx, 8(%eax)
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//movl %edx, 12(%eax)
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movl %ebp, 16(%eax)
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movl %esi, 20(%eax)
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movl %edi, 24(%eax)
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//movl %cs, 32(%eax)
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//movl %ds, 34(%eax)
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//movl %ss, 36(%eax)
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//movl %es, 38(%eax)
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//movl %fs, 40(%eax)
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//movl %gs, 42(%eax)
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// save the flags
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pushf
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@ -48,20 +48,20 @@ swap_registers:
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// restore the new context
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movl 4(%esp), %eax
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movl 4(%eax), %ebx
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// save ecx for later...
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movl 12(%eax), %edx
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movl 16(%eax), %ebp
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movl 20(%eax), %esi
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movl 24(%eax), %edi
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movl 28(%eax), %esp
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// We can't actually change this...
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//movl 32(%eax), %cs
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//movl 34(%eax), %ds
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//movl 36(%eax), %ss
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//movl 38(%eax), %es
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//movl 40(%eax), %fs
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//movl 42(%eax), %gs
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movl 4(%eax), %ebx
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// save ecx for later...
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//movl 12(%eax), %edx
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movl 16(%eax), %ebp
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movl 20(%eax), %esi
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movl 24(%eax), %edi
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movl 28(%eax), %esp
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// We can't actually change this...
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//movl 32(%eax), %cs
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//movl 34(%eax), %ds
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//movl 36(%eax), %ss
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//movl 38(%eax), %es
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//movl 40(%eax), %fs
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//movl 42(%eax), %gs
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// restore the flags
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movl 44(%eax), %ecx
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@ -69,8 +69,8 @@ swap_registers:
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popf
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// ok, now we can restore ecx
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movl 8(%eax), %ecx
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//movl 8(%eax), %ecx
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// Return!
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jmp *48(%eax)
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