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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /* | ||
| Copyright Claudio Jeker 2024 | ||
| Distributed under the Boost Software License, Version 1.0. | ||
| (See accompanying file LICENSE_1_0.txt or copy at | ||
| http://www.boost.org/LICENSE_1_0.txt) | ||
| */ | ||
|
|
||
| /* | ||
| * typedef void* fcontext_t; | ||
| * | ||
| * struct transfer_t { | ||
| * fcontext_t fctx; | ||
| * void * data; | ||
| * }; | ||
| * | ||
| * transfer_t jump_fcontext(fcontext_t const to, void *vp); | ||
| */ | ||
| #define CC64FSZ 176 | ||
| #define BIAS 2047 | ||
| #define SP 128 | ||
| #define I7 136 | ||
|
|
||
| .file "jump_sparc64_sysv_elf_gas.S" | ||
| .text | ||
| .align 4 | ||
| .global jump_fcontext | ||
| .type jump_fcontext, %function | ||
| jump_fcontext: | ||
| # prepare stack | ||
| save %sp, -CC64FSZ, %sp | ||
|
|
||
| # store framepointer and return address in slots reserved | ||
| # for arguments | ||
| stx %fp, [%sp + BIAS + SP] | ||
| stx %i7, [%sp + BIAS + I7] | ||
| mov %sp, %o0 | ||
| # force flush register windows to stack and with that save context | ||
| flushw | ||
| # get SP (pointing to new context-data) from %i0 param | ||
| mov %i0, %sp | ||
| # load framepointer and return address from context | ||
| ldx [%sp + BIAS + SP], %fp | ||
| ldx [%sp + BIAS + I7], %i7 | ||
|
|
||
| ret | ||
| restore %o0, %g0, %o0 | ||
| # restore old %sp (pointing to old context-data) in %o0 | ||
| # *data stored in %o1 was not modified | ||
| .size jump_fcontext,.-jump_fcontext | ||
| # Mark that we don't need executable stack. | ||
| .section .note.GNU-stack,"",%progbits |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| /* | ||
| Copyright Claudio Jeker 2024 | ||
| Distributed under the Boost Software License, Version 1.0. | ||
| (See accompanying file LICENSE_1_0.txt or copy at | ||
| http://www.boost.org/LICENSE_1_0.txt) | ||
| */ | ||
|
|
||
| /* | ||
| * fcontext_t *make_fcontext(void *sp, size_t size, void (*fn)(transfer_t)); | ||
| */ | ||
| #define CC64FSZ 176 | ||
| #define BIAS 2047 | ||
| #define FP 112 | ||
| #define SP 128 | ||
| #define I7 136 | ||
|
|
||
| .file "make_sparc64_sysv_elf_gas.S" | ||
| .text | ||
| .align 4 | ||
| .global make_fcontext | ||
| .type make_fcontext, %function | ||
| make_fcontext: | ||
| save %sp, -CC64FSZ, %sp | ||
|
|
||
| # shift address in %i0 (allocated stack) to lower 16 byte boundary | ||
| and %i0, -0xf, %i0 | ||
|
|
||
| # reserve space for two frames on the stack | ||
| # the first frame is for the call the second one holds the data | ||
| # for jump_fcontext | ||
| sub %i0, 2 * CC64FSZ, %i0 | ||
|
|
||
| # third argument of make_fcontext() is the context-function to call | ||
| # store it in the first stack frame, also clear %fp there to indicate | ||
| # the end of the stack. | ||
| stx %i2, [%i0 + CC64FSZ + I7] | ||
| stx %g0, [%i0 + CC64FSZ + FP] | ||
|
|
||
| # On OpenBSD stackghost prevents overriding the return address on | ||
| # a stack frame. So this code uses an extra trampoline to load | ||
| # to call the context-function and then do the _exit(0) dance. | ||
| # Extract the full address of the trampoline via pc relative addressing | ||
| 1: | ||
| rd %pc, %l0 | ||
| add %l0, (trampoline - 1b - 8), %l0 | ||
| stx %l0, [%i0 + I7] | ||
|
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||
| # Save framepointer to first stack frame but first substract the BIAS | ||
| add %i0, CC64FSZ - BIAS, %l0 | ||
| stx %l0, [%i0 + SP] | ||
|
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||
| # Return context-data which is also includes the BIAS | ||
| ret | ||
| restore %i0, -BIAS, %o0 | ||
|
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| trampoline: | ||
| ldx [%sp + BIAS + I7], %l0 | ||
|
|
||
| # no need to setup transfer_t, already in %o0 and %o1 | ||
| jmpl %l0, %o7 | ||
| nop | ||
|
|
||
| call _exit | ||
| clr %o0 | ||
| unimp | ||
| .size make_fcontext,.-make_fcontext | ||
| # Mark that we don't need executable stack. | ||
| .section .note.GNU-stack,"",%progbits |
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