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libc/aarch64: Add a non-trivial getcontextx

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Add support for extra registers to the arm64 getcontextx. As no
registers are defined this just adds the extra register list and an end
context.

Reviewed by:	kib
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D44255
This commit is contained in:
Andrew Turner 2024-03-06 12:51:18 +00:00
parent fd6b1cc34e
commit 5202ca77aa
1 changed files with 18 additions and 2 deletions
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20
lib/libc/aarch64/gen/getcontextx.c
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@ -32,13 +32,26 @@
int
__getcontextx_size(void)
{
size_t size;
return (sizeof(ucontext_t));
size = sizeof(ucontext_t);
size += sizeof(struct arm64_reg_context); /* Space for ARM64_CTX_END */
return (size);
}
int
__fillcontextx2(char *ctx)
{
struct arm64_reg_context *reg_ctx;
ucontext_t *ucp;
ucp = (ucontext_t *)ctx;
ucp->uc_mcontext.mc_ptr = (uint64_t)(ucp + 1);
reg_ctx = (struct arm64_reg_context *)ucp->uc_mcontext.mc_ptr;
reg_ctx->ctx_id = ARM64_CTX_END;
reg_ctx->ctx_size = sizeof(struct arm64_reg_context);
return (0);
}
@ -49,7 +62,10 @@ __fillcontextx(char *ctx)
ucontext_t *ucp;
ucp = (ucontext_t *)ctx;
return (getcontext(ucp));
if (getcontext(ucp) == -1)
return (-1);
__fillcontextx2(ctx);
return (0);
}
__weak_reference(__getcontextx, getcontextx);