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linuxkm/linuxkm_wc_port.h: use more flexible logic to define WC_LKM_INDIRECT_SYM(), allowing various overrides and orthogonalizing the definitions proper, and add explanatory comments.

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This commit is contained in:
Daniel Pouzzner
2025-07-22 14:40:45 -05:00
parent 0495f2cc20
commit c26f6ded14
1 changed files with 23 additions and 3 deletions
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26
linuxkm/linuxkm_wc_port.h
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@@ -869,12 +869,32 @@
extern const struct wolfssl_linuxkm_pie_redirect_table *wolfssl_linuxkm_get_pie_redirect_table(void);
extern struct wolfssl_linuxkm_pie_redirect_table wolfssl_linuxkm_pie_redirect_table;
#if defined(CONFIG_X86)
#define WC_LKM_INDIRECT_SYM(x) (wolfssl_linuxkm_pie_redirect_table.x)
#if defined(WC_LKM_INDIRECT_SYM)
/* keep user-supplied override definition. */
#elif defined(WC_LKM_INDIRECT_SYM_BY_FUNC_ONLY) || \
defined(WC_LKM_INDIRECT_SYM_BY_DIRECT_TABLE_READ)
/* keep user-supplied override method. */
#elif defined(CONFIG_X86)
#define WC_LKM_INDIRECT_SYM_BY_DIRECT_TABLE_READ
#elif defined(CONFIG_ARM64)
#define WC_LKM_INDIRECT_SYM(x) (wolfssl_linuxkm_get_pie_redirect_table()->x)
/* direct access to wolfssl_linuxkm_pie_redirect_table.x on aarch64
* produces GOT relocations, e.g. R_AARCH64_LD64_GOT_LO12_NC.
*/
#define WC_LKM_INDIRECT_SYM_BY_FUNC_ONLY
#else
/* for other archs, by default use the safe way. */
#define WC_LKM_INDIRECT_SYM_BY_FUNC_ONLY
#endif
#if defined(WC_LKM_INDIRECT_SYM)
/* keep user-supplied override definition. */
#elif defined(WC_LKM_INDIRECT_SYM_BY_FUNC_ONLY)
#define WC_LKM_INDIRECT_SYM(x) (wolfssl_linuxkm_get_pie_redirect_table()->x)
#elif defined(WC_LKM_INDIRECT_SYM_BY_DIRECT_TABLE_READ)
#define WC_LKM_INDIRECT_SYM(x) (wolfssl_linuxkm_pie_redirect_table.x)
#else
#error no WC_LKM_INDIRECT_SYM method defined.
#endif
#ifdef __PIE__