59 lines
3.1 KiB
C
59 lines
3.1 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/log/log.h"
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#include "libc/log/shadowargs.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/symbols.h"
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alignas(1) const
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char __shadowargs_slotnames[SHADOWARGS_SLOTS][SHADOWARGS_MAXNAME] = {
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"func", "%rsp", "%rdi", "%rsi", "%rdx", "%rcx", "%r8", "%r9",
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};
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alignas(64) struct ShadowArgs __shadowargs[SHADOWARGS_COUNT];
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unsigned __shadowargs_index;
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nocallersavedregisters void __fentry__(uint64_t rdi, uint64_t rsi, uint64_t rdx,
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uint64_t rcx, uint64_t r8, uint64_t r9) {
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void *addr = __builtin_return_address(0);
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intptr_t frame = (intptr_t)__builtin_frame_address(0);
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unsigned i = __shadowargs_index;
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intptr_t lastframe = (intptr_t)__shadowargs[i].frame;
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if (frame < lastframe) {
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i--;
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i &= SHADOWARGS_COUNT - 1;
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} else if (frame > lastframe) {
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unsigned j = i;
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do {
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j++;
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j &= SHADOWARGS_COUNT - 1;
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} while (frame > (intptr_t)__shadowargs[j].frame && j != i);
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i = j;
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}
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__shadowargs[i].addr = addr;
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__shadowargs[i].frame = (void *)frame;
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__shadowargs[i].arg1 = rdi;
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__shadowargs[i].arg2 = rsi;
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__shadowargs[i].arg3 = rdx;
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__shadowargs[i].arg4 = rcx;
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__shadowargs[i].arg5 = r8;
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__shadowargs[i].arg6 = r9;
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__shadowargs_index = i;
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}
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